diff --git a/Cargo.lock b/Cargo.lock
index df2842bddb386..4d95f5e11b2cb 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3474,11 +3474,9 @@ name = "rustc_codegen_ssa"
 version = "0.0.0"
 dependencies = [
  "ar_archive_writer",
- "arrayvec",
  "bitflags",
  "bstr",
  "cc",
- "either",
  "itertools",
  "libc",
  "object 0.37.0",
diff --git a/compiler/rustc_ast_lowering/messages.ftl b/compiler/rustc_ast_lowering/messages.ftl
index 50eb7c7ae99bd..c6472fd45fa98 100644
--- a/compiler/rustc_ast_lowering/messages.ftl
+++ b/compiler/rustc_ast_lowering/messages.ftl
@@ -172,9 +172,6 @@ ast_lowering_template_modifier = template modifier
 
 ast_lowering_this_not_async = this is not `async`
 
-ast_lowering_underscore_array_length_unstable =
-    using `_` for array lengths is unstable
-
 ast_lowering_underscore_expr_lhs_assign =
     in expressions, `_` can only be used on the left-hand side of an assignment
     .label = `_` not allowed here
diff --git a/compiler/rustc_ast_lowering/src/lib.rs b/compiler/rustc_ast_lowering/src/lib.rs
index 3b99a653417aa..e74fd1db15b96 100644
--- a/compiler/rustc_ast_lowering/src/lib.rs
+++ b/compiler/rustc_ast_lowering/src/lib.rs
@@ -48,7 +48,7 @@ use rustc_data_structures::sorted_map::SortedMap;
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_data_structures::sync::spawn;
 use rustc_data_structures::tagged_ptr::TaggedRef;
-use rustc_errors::{DiagArgFromDisplay, DiagCtxtHandle, StashKey};
+use rustc_errors::{DiagArgFromDisplay, DiagCtxtHandle};
 use rustc_hir::def::{DefKind, LifetimeRes, Namespace, PartialRes, PerNS, Res};
 use rustc_hir::def_id::{CRATE_DEF_ID, LOCAL_CRATE, LocalDefId};
 use rustc_hir::lints::DelayedLint;
@@ -60,7 +60,7 @@ use rustc_index::{Idx, IndexSlice, IndexVec};
 use rustc_macros::extension;
 use rustc_middle::span_bug;
 use rustc_middle::ty::{ResolverAstLowering, TyCtxt};
-use rustc_session::parse::{add_feature_diagnostics, feature_err};
+use rustc_session::parse::add_feature_diagnostics;
 use rustc_span::symbol::{Ident, Symbol, kw, sym};
 use rustc_span::{DUMMY_SP, DesugaringKind, Span};
 use smallvec::SmallVec;
@@ -2109,15 +2109,6 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         // `ExprKind::Paren(ExprKind::Underscore)` and should also be lowered to `GenericArg::Infer`
         match c.value.peel_parens().kind {
             ExprKind::Underscore => {
-                if !self.tcx.features().generic_arg_infer() {
-                    feature_err(
-                        &self.tcx.sess,
-                        sym::generic_arg_infer,
-                        c.value.span,
-                        fluent_generated::ast_lowering_underscore_array_length_unstable,
-                    )
-                    .stash(c.value.span, StashKey::UnderscoreForArrayLengths);
-                }
                 let ct_kind = hir::ConstArgKind::Infer(self.lower_span(c.value.span), ());
                 self.arena.alloc(hir::ConstArg { hir_id: self.lower_node_id(c.id), kind: ct_kind })
             }
diff --git a/compiler/rustc_codegen_ssa/Cargo.toml b/compiler/rustc_codegen_ssa/Cargo.toml
index e9c4c255bce08..cfae1b3ec98e5 100644
--- a/compiler/rustc_codegen_ssa/Cargo.toml
+++ b/compiler/rustc_codegen_ssa/Cargo.toml
@@ -6,13 +6,11 @@ edition = "2024"
 [dependencies]
 # tidy-alphabetical-start
 ar_archive_writer = "0.4.2"
-arrayvec = { version = "0.7", default-features = false }
 bitflags = "2.4.1"
 bstr = "1.11.3"
 # Pinned so `cargo update` bumps don't cause breakage. Please also update the
 # `cc` in `rustc_llvm` if you update the `cc` here.
 cc = "=1.2.16"
-either = "1.5.0"
 itertools = "0.12"
 pathdiff = "0.2.0"
 regex = "1.4"
diff --git a/compiler/rustc_codegen_ssa/src/mir/debuginfo.rs b/compiler/rustc_codegen_ssa/src/mir/debuginfo.rs
index f731613d67e8a..025f5fb54f428 100644
--- a/compiler/rustc_codegen_ssa/src/mir/debuginfo.rs
+++ b/compiler/rustc_codegen_ssa/src/mir/debuginfo.rs
@@ -317,7 +317,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
         let name = if bx.sess().fewer_names() {
             None
         } else {
-            Some(match whole_local_var.or(fallback_var.clone()) {
+            Some(match whole_local_var.or_else(|| fallback_var.clone()) {
                 Some(var) if var.name != sym::empty => var.name.to_string(),
                 _ => format!("{local:?}"),
             })
diff --git a/compiler/rustc_codegen_ssa/src/mir/naked_asm.rs b/compiler/rustc_codegen_ssa/src/mir/naked_asm.rs
index b805dc094e913..9f66457a74005 100644
--- a/compiler/rustc_codegen_ssa/src/mir/naked_asm.rs
+++ b/compiler/rustc_codegen_ssa/src/mir/naked_asm.rs
@@ -205,7 +205,7 @@ fn prefix_and_suffix<'tcx>(
     let mut end = String::new();
     match asm_binary_format {
         BinaryFormat::Elf => {
-            let section = link_section.unwrap_or(format!(".text.{asm_name}"));
+            let section = link_section.unwrap_or_else(|| format!(".text.{asm_name}"));
 
             let progbits = match is_arm {
                 true => "%progbits",
@@ -239,7 +239,7 @@ fn prefix_and_suffix<'tcx>(
             }
         }
         BinaryFormat::MachO => {
-            let section = link_section.unwrap_or("__TEXT,__text".to_string());
+            let section = link_section.unwrap_or_else(|| "__TEXT,__text".to_string());
             writeln!(begin, ".pushsection {},regular,pure_instructions", section).unwrap();
             writeln!(begin, ".balign {align_bytes}").unwrap();
             write_linkage(&mut begin).unwrap();
@@ -256,7 +256,7 @@ fn prefix_and_suffix<'tcx>(
             }
         }
         BinaryFormat::Coff => {
-            let section = link_section.unwrap_or(format!(".text.{asm_name}"));
+            let section = link_section.unwrap_or_else(|| format!(".text.{asm_name}"));
             writeln!(begin, ".pushsection {},\"xr\"", section).unwrap();
             writeln!(begin, ".balign {align_bytes}").unwrap();
             write_linkage(&mut begin).unwrap();
@@ -273,7 +273,7 @@ fn prefix_and_suffix<'tcx>(
             }
         }
         BinaryFormat::Wasm => {
-            let section = link_section.unwrap_or(format!(".text.{asm_name}"));
+            let section = link_section.unwrap_or_else(|| format!(".text.{asm_name}"));
 
             writeln!(begin, ".section {section},\"\",@").unwrap();
             // wasm functions cannot be aligned, so skip
diff --git a/compiler/rustc_codegen_ssa/src/mir/operand.rs b/compiler/rustc_codegen_ssa/src/mir/operand.rs
index e9389ddf93b3f..99957c6770845 100644
--- a/compiler/rustc_codegen_ssa/src/mir/operand.rs
+++ b/compiler/rustc_codegen_ssa/src/mir/operand.rs
@@ -1,9 +1,9 @@
 use std::fmt;
 
-use arrayvec::ArrayVec;
-use either::Either;
 use rustc_abi as abi;
-use rustc_abi::{Align, BackendRepr, FIRST_VARIANT, Primitive, Size, TagEncoding, Variants};
+use rustc_abi::{
+    Align, BackendRepr, FIRST_VARIANT, FieldIdx, Primitive, Size, TagEncoding, VariantIdx, Variants,
+};
 use rustc_middle::mir::interpret::{Pointer, Scalar, alloc_range};
 use rustc_middle::mir::{self, ConstValue};
 use rustc_middle::ty::Ty;
@@ -13,6 +13,7 @@ use rustc_session::config::OptLevel;
 use tracing::{debug, instrument};
 
 use super::place::{PlaceRef, PlaceValue};
+use super::rvalue::transmute_immediate;
 use super::{FunctionCx, LocalRef};
 use crate::common::IntPredicate;
 use crate::traits::*;
@@ -69,31 +70,6 @@ pub enum OperandValue<V> {
 }
 
 impl<V: CodegenObject> OperandValue<V> {
-    /// If this is ZeroSized/Immediate/Pair, return an array of the 0/1/2 values.
-    /// If this is Ref, return the place.
-    #[inline]
-    pub(crate) fn immediates_or_place(self) -> Either<ArrayVec<V, 2>, PlaceValue<V>> {
-        match self {
-            OperandValue::ZeroSized => Either::Left(ArrayVec::new()),
-            OperandValue::Immediate(a) => Either::Left(ArrayVec::from_iter([a])),
-            OperandValue::Pair(a, b) => Either::Left([a, b].into()),
-            OperandValue::Ref(p) => Either::Right(p),
-        }
-    }
-
-    /// Given an array of 0/1/2 immediate values, return ZeroSized/Immediate/Pair.
-    #[inline]
-    pub(crate) fn from_immediates(immediates: ArrayVec<V, 2>) -> Self {
-        let mut it = immediates.into_iter();
-        let Some(a) = it.next() else {
-            return OperandValue::ZeroSized;
-        };
-        let Some(b) = it.next() else {
-            return OperandValue::Immediate(a);
-        };
-        OperandValue::Pair(a, b)
-    }
-
     /// Treat this value as a pointer and return the data pointer and
     /// optional metadata as backend values.
     ///
@@ -595,6 +571,105 @@ impl<'a, 'tcx, V: CodegenObject> OperandRef<'tcx, V> {
             }
         }
     }
+
+    /// Creates an incomplete operand containing the [`abi::Scalar`]s expected based
+    /// on the `layout` passed. This is for use with [`OperandRef::insert_field`]
+    /// later to set the necessary immediate(s).
+    ///
+    /// Returns `None` for `layout`s which cannot be built this way.
+    pub(crate) fn builder(
+        layout: TyAndLayout<'tcx>,
+    ) -> Option<OperandRef<'tcx, Result<V, abi::Scalar>>> {
+        let val = match layout.backend_repr {
+            BackendRepr::Memory { .. } if layout.is_zst() => OperandValue::ZeroSized,
+            BackendRepr::Scalar(s) => OperandValue::Immediate(Err(s)),
+            BackendRepr::ScalarPair(a, b) => OperandValue::Pair(Err(a), Err(b)),
+            BackendRepr::Memory { .. } | BackendRepr::SimdVector { .. } => return None,
+        };
+        Some(OperandRef { val, layout })
+    }
+}
+
+impl<'a, 'tcx, V: CodegenObject> OperandRef<'tcx, Result<V, abi::Scalar>> {
+    pub(crate) fn insert_field<Bx: BuilderMethods<'a, 'tcx, Value = V>>(
+        &mut self,
+        bx: &mut Bx,
+        v: VariantIdx,
+        f: FieldIdx,
+        operand: OperandRef<'tcx, V>,
+    ) {
+        let (expect_zst, is_zero_offset) = if let abi::FieldsShape::Primitive = self.layout.fields {
+            // The other branch looking at field layouts ICEs for primitives,
+            // so we need to handle them separately.
+            // Multiple fields is possible for cases such as aggregating
+            // a thin pointer, where the second field is the unit.
+            assert!(!self.layout.is_zst());
+            assert_eq!(v, FIRST_VARIANT);
+            let first_field = f == FieldIdx::ZERO;
+            (!first_field, first_field)
+        } else {
+            let variant_layout = self.layout.for_variant(bx.cx(), v);
+            let field_layout = variant_layout.field(bx.cx(), f.as_usize());
+            let field_offset = variant_layout.fields.offset(f.as_usize());
+            (field_layout.is_zst(), field_offset == Size::ZERO)
+        };
+
+        let mut update = |tgt: &mut Result<V, abi::Scalar>, src, from_scalar| {
+            let from_bty = bx.cx().type_from_scalar(from_scalar);
+            let to_scalar = tgt.unwrap_err();
+            let to_bty = bx.cx().type_from_scalar(to_scalar);
+            let imm = transmute_immediate(bx, src, from_scalar, from_bty, to_scalar, to_bty);
+            *tgt = Ok(imm);
+        };
+
+        match (operand.val, operand.layout.backend_repr) {
+            (OperandValue::ZeroSized, _) if expect_zst => {}
+            (OperandValue::Immediate(v), BackendRepr::Scalar(from_scalar)) => match &mut self.val {
+                OperandValue::Immediate(val @ Err(_)) if is_zero_offset => {
+                    update(val, v, from_scalar);
+                }
+                OperandValue::Pair(fst @ Err(_), _) if is_zero_offset => {
+                    update(fst, v, from_scalar);
+                }
+                OperandValue::Pair(_, snd @ Err(_)) if !is_zero_offset => {
+                    update(snd, v, from_scalar);
+                }
+                _ => bug!("Tried to insert {operand:?} into {v:?}.{f:?} of {self:?}"),
+            },
+            (OperandValue::Pair(a, b), BackendRepr::ScalarPair(from_sa, from_sb)) => {
+                match &mut self.val {
+                    OperandValue::Pair(fst @ Err(_), snd @ Err(_)) => {
+                        update(fst, a, from_sa);
+                        update(snd, b, from_sb);
+                    }
+                    _ => bug!("Tried to insert {operand:?} into {v:?}.{f:?} of {self:?}"),
+                }
+            }
+            _ => bug!("Unsupported operand {operand:?} inserting into {v:?}.{f:?} of {self:?}"),
+        }
+    }
+
+    /// After having set all necessary fields, this converts the
+    /// `OperandValue<Result<V, _>>` (as obtained from [`OperandRef::builder`])
+    /// to the normal `OperandValue<V>`.
+    ///
+    /// ICEs if any required fields were not set.
+    pub fn build(&self) -> OperandRef<'tcx, V> {
+        let OperandRef { val, layout } = *self;
+
+        let unwrap = |r: Result<V, abi::Scalar>| match r {
+            Ok(v) => v,
+            Err(_) => bug!("OperandRef::build called while fields are missing {self:?}"),
+        };
+
+        let val = match val {
+            OperandValue::ZeroSized => OperandValue::ZeroSized,
+            OperandValue::Immediate(v) => OperandValue::Immediate(unwrap(v)),
+            OperandValue::Pair(a, b) => OperandValue::Pair(unwrap(a), unwrap(b)),
+            OperandValue::Ref(_) => bug!(),
+        };
+        OperandRef { val, layout }
+    }
 }
 
 impl<'a, 'tcx, V: CodegenObject> OperandValue<V> {
diff --git a/compiler/rustc_codegen_ssa/src/mir/rvalue.rs b/compiler/rustc_codegen_ssa/src/mir/rvalue.rs
index b62ac89661f26..e1d8b7546cf42 100644
--- a/compiler/rustc_codegen_ssa/src/mir/rvalue.rs
+++ b/compiler/rustc_codegen_ssa/src/mir/rvalue.rs
@@ -1,7 +1,6 @@
 use std::assert_matches::assert_matches;
 
-use arrayvec::ArrayVec;
-use rustc_abi::{self as abi, FIRST_VARIANT, FieldIdx};
+use rustc_abi::{self as abi, FIRST_VARIANT};
 use rustc_middle::ty::adjustment::PointerCoercion;
 use rustc_middle::ty::layout::{HasTyCtxt, HasTypingEnv, LayoutOf, TyAndLayout};
 use rustc_middle::ty::{self, Instance, Ty, TyCtxt};
@@ -708,38 +707,15 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
 
                 // `rvalue_creates_operand` has arranged that we only get here if
                 // we can build the aggregate immediate from the field immediates.
-                let mut inputs = ArrayVec::<Bx::Value, 2>::new();
-                let mut input_scalars = ArrayVec::<abi::Scalar, 2>::new();
-                for field_idx in layout.fields.index_by_increasing_offset() {
-                    let field_idx = FieldIdx::from_usize(field_idx);
-                    let op = self.codegen_operand(bx, &fields[field_idx]);
-                    let values = op.val.immediates_or_place().left_or_else(|p| {
-                        bug!("Field {field_idx:?} is {p:?} making {layout:?}");
-                    });
-                    let scalars = self.value_kind(op.layout).scalars().unwrap();
-                    assert_eq!(values.len(), scalars.len());
-                    inputs.extend(values);
-                    input_scalars.extend(scalars);
+                let Some(mut builder) = OperandRef::builder(layout) else {
+                    bug!("Cannot use type in operand builder: {layout:?}")
+                };
+                for (field_idx, field) in fields.iter_enumerated() {
+                    let op = self.codegen_operand(bx, field);
+                    builder.insert_field(bx, FIRST_VARIANT, field_idx, op);
                 }
 
-                let output_scalars = self.value_kind(layout).scalars().unwrap();
-                itertools::izip!(&mut inputs, input_scalars, output_scalars).for_each(
-                    |(v, in_s, out_s)| {
-                        if in_s != out_s {
-                            // We have to be really careful about bool here, because
-                            // `(bool,)` stays i1 but `Cell<bool>` becomes i8.
-                            *v = bx.from_immediate(*v);
-                            *v = bx.to_immediate_scalar(*v, out_s);
-                        }
-                    },
-                );
-
-                let val = OperandValue::from_immediates(inputs);
-                assert!(
-                    val.is_expected_variant_for_type(self.cx, layout),
-                    "Made wrong variant {val:?} for type {layout:?}",
-                );
-                OperandRef { val, layout }
+                builder.build()
             }
             mir::Rvalue::ShallowInitBox(ref operand, content_ty) => {
                 let operand = self.codegen_operand(bx, operand);
@@ -1082,10 +1058,10 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
                     mir::AggregateKind::Coroutine(..) | mir::AggregateKind::CoroutineClosure(..) => false,
                 };
                 allowed_kind && {
-                let ty = rvalue.ty(self.mir, self.cx.tcx());
-                let ty = self.monomorphize(ty);
+                    let ty = rvalue.ty(self.mir, self.cx.tcx());
+                    let ty = self.monomorphize(ty);
                     let layout = self.cx.spanned_layout_of(ty, span);
-                    !self.cx.is_backend_ref(layout)
+                    OperandRef::<Bx::Value>::builder(layout).is_some()
                 }
             }
         }
@@ -1129,23 +1105,12 @@ enum OperandValueKind {
     ZeroSized,
 }
 
-impl OperandValueKind {
-    fn scalars(self) -> Option<ArrayVec<abi::Scalar, 2>> {
-        Some(match self {
-            OperandValueKind::ZeroSized => ArrayVec::new(),
-            OperandValueKind::Immediate(a) => ArrayVec::from_iter([a]),
-            OperandValueKind::Pair(a, b) => [a, b].into(),
-            OperandValueKind::Ref => return None,
-        })
-    }
-}
-
 /// Transmutes one of the immediates from an [`OperandValue::Immediate`]
 /// or an [`OperandValue::Pair`] to an immediate of the target type.
 ///
 /// `to_backend_ty` must be the *non*-immediate backend type (so it will be
 /// `i8`, not `i1`, for `bool`-like types.)
-fn transmute_immediate<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
+pub(super) fn transmute_immediate<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
     bx: &mut Bx,
     mut imm: Bx::Value,
     from_scalar: abi::Scalar,
diff --git a/compiler/rustc_codegen_ssa/src/traits/type_.rs b/compiler/rustc_codegen_ssa/src/traits/type_.rs
index 70331b72353e4..dcd9e25b2c952 100644
--- a/compiler/rustc_codegen_ssa/src/traits/type_.rs
+++ b/compiler/rustc_codegen_ssa/src/traits/type_.rs
@@ -1,4 +1,4 @@
-use rustc_abi::{AddressSpace, Float, Integer, Reg};
+use rustc_abi::{AddressSpace, Float, Integer, Primitive, Reg, Scalar};
 use rustc_middle::bug;
 use rustc_middle::ty::Ty;
 use rustc_middle::ty::layout::{HasTyCtxt, HasTypingEnv, TyAndLayout};
@@ -84,6 +84,24 @@ pub trait DerivedTypeCodegenMethods<'tcx>:
     fn type_is_freeze(&self, ty: Ty<'tcx>) -> bool {
         ty.is_freeze(self.tcx(), self.typing_env())
     }
+
+    fn type_from_primitive(&self, p: Primitive) -> Self::Type {
+        use Primitive::*;
+        match p {
+            Int(i, _) => self.type_from_integer(i),
+            Float(f) => self.type_from_float(f),
+            Pointer(address_space) => self.type_ptr_ext(address_space),
+        }
+    }
+
+    fn type_from_scalar(&self, s: Scalar) -> Self::Type {
+        // `MaybeUninit` being `repr(transparent)` somewhat implies that the type
+        // of a scalar has to be the type of its primitive (which is true in LLVM,
+        // where noundef is a parameter attribute or metadata) but if we ever get
+        // a backend where that's no longer true, every use of this will need to
+        // to carefully scrutinized and re-evaluated.
+        self.type_from_primitive(s.primitive())
+    }
 }
 
 impl<'tcx, T> DerivedTypeCodegenMethods<'tcx> for T where
diff --git a/compiler/rustc_errors/src/emitter.rs b/compiler/rustc_errors/src/emitter.rs
index fe01e289334cc..6ab6f96079ebd 100644
--- a/compiler/rustc_errors/src/emitter.rs
+++ b/compiler/rustc_errors/src/emitter.rs
@@ -34,6 +34,7 @@ use crate::snippet::{
     Annotation, AnnotationColumn, AnnotationType, Line, MultilineAnnotation, Style, StyledString,
 };
 use crate::styled_buffer::StyledBuffer;
+use crate::timings::TimingRecord;
 use crate::translation::{Translate, to_fluent_args};
 use crate::{
     CodeSuggestion, DiagInner, DiagMessage, ErrCode, FluentBundle, LazyFallbackBundle, Level,
@@ -164,11 +165,16 @@ impl Margin {
     }
 }
 
+pub enum TimingEvent {
+    Start,
+    End,
+}
+
 const ANONYMIZED_LINE_NUM: &str = "LL";
 
 pub type DynEmitter = dyn Emitter + DynSend;
 
-/// Emitter trait for emitting errors.
+/// Emitter trait for emitting errors and other structured information.
 pub trait Emitter: Translate {
     /// Emit a structured diagnostic.
     fn emit_diagnostic(&mut self, diag: DiagInner, registry: &Registry);
@@ -177,6 +183,10 @@ pub trait Emitter: Translate {
     /// Currently only supported for the JSON format.
     fn emit_artifact_notification(&mut self, _path: &Path, _artifact_type: &str) {}
 
+    /// Emit a timestamp with start/end of a timing section.
+    /// Currently only supported for the JSON format.
+    fn emit_timing_section(&mut self, _record: TimingRecord, _event: TimingEvent) {}
+
     /// Emit a report about future breakage.
     /// Currently only supported for the JSON format.
     fn emit_future_breakage_report(&mut self, _diags: Vec<DiagInner>, _registry: &Registry) {}
diff --git a/compiler/rustc_errors/src/json.rs b/compiler/rustc_errors/src/json.rs
index a6583407b7e7e..d67e2ba2d60ec 100644
--- a/compiler/rustc_errors/src/json.rs
+++ b/compiler/rustc_errors/src/json.rs
@@ -28,9 +28,10 @@ use termcolor::{ColorSpec, WriteColor};
 use crate::diagnostic::IsLint;
 use crate::emitter::{
     ColorConfig, Destination, Emitter, HumanEmitter, HumanReadableErrorType, OutputTheme,
-    should_show_source_code,
+    TimingEvent, should_show_source_code,
 };
 use crate::registry::Registry;
+use crate::timings::{TimingRecord, TimingSection};
 use crate::translation::{Translate, to_fluent_args};
 use crate::{
     CodeSuggestion, FluentBundle, LazyFallbackBundle, MultiSpan, SpanLabel, Subdiag, Suggestions,
@@ -104,6 +105,7 @@ impl JsonEmitter {
 enum EmitTyped<'a> {
     Diagnostic(Diagnostic),
     Artifact(ArtifactNotification<'a>),
+    SectionTiming(SectionTimestamp<'a>),
     FutureIncompat(FutureIncompatReport<'a>),
     UnusedExtern(UnusedExterns<'a>),
 }
@@ -135,6 +137,21 @@ impl Emitter for JsonEmitter {
         }
     }
 
+    fn emit_timing_section(&mut self, record: TimingRecord, event: TimingEvent) {
+        let event = match event {
+            TimingEvent::Start => "start",
+            TimingEvent::End => "end",
+        };
+        let name = match record.section {
+            TimingSection::Linking => "link",
+        };
+        let data = SectionTimestamp { name, event, timestamp: record.timestamp };
+        let result = self.emit(EmitTyped::SectionTiming(data));
+        if let Err(e) = result {
+            panic!("failed to print timing section: {e:?}");
+        }
+    }
+
     fn emit_future_breakage_report(&mut self, diags: Vec<crate::DiagInner>, registry: &Registry) {
         let data: Vec<FutureBreakageItem<'_>> = diags
             .into_iter()
@@ -263,6 +280,16 @@ struct ArtifactNotification<'a> {
     emit: &'a str,
 }
 
+#[derive(Serialize)]
+struct SectionTimestamp<'a> {
+    /// Name of the section
+    name: &'a str,
+    /// Start/end of the section
+    event: &'a str,
+    /// Opaque timestamp.
+    timestamp: u128,
+}
+
 #[derive(Serialize)]
 struct FutureBreakageItem<'a> {
     // Always EmitTyped::Diagnostic, but we want to make sure it gets serialized
diff --git a/compiler/rustc_errors/src/lib.rs b/compiler/rustc_errors/src/lib.rs
index 9f72fc4705aea..b520eb353d650 100644
--- a/compiler/rustc_errors/src/lib.rs
+++ b/compiler/rustc_errors/src/lib.rs
@@ -74,7 +74,9 @@ pub use snippet::Style;
 pub use termcolor::{Color, ColorSpec, WriteColor};
 use tracing::debug;
 
+use crate::emitter::TimingEvent;
 use crate::registry::Registry;
+use crate::timings::TimingRecord;
 
 pub mod annotate_snippet_emitter_writer;
 pub mod codes;
@@ -90,6 +92,7 @@ mod snippet;
 mod styled_buffer;
 #[cfg(test)]
 mod tests;
+pub mod timings;
 pub mod translation;
 
 pub type PResult<'a, T> = Result<T, Diag<'a>>;
@@ -1156,6 +1159,14 @@ impl<'a> DiagCtxtHandle<'a> {
         self.inner.borrow_mut().emitter.emit_artifact_notification(path, artifact_type);
     }
 
+    pub fn emit_timing_section_start(&self, record: TimingRecord) {
+        self.inner.borrow_mut().emitter.emit_timing_section(record, TimingEvent::Start);
+    }
+
+    pub fn emit_timing_section_end(&self, record: TimingRecord) {
+        self.inner.borrow_mut().emitter.emit_timing_section(record, TimingEvent::End);
+    }
+
     pub fn emit_future_breakage_report(&self) {
         let inner = &mut *self.inner.borrow_mut();
         let diags = std::mem::take(&mut inner.future_breakage_diagnostics);
diff --git a/compiler/rustc_errors/src/timings.rs b/compiler/rustc_errors/src/timings.rs
new file mode 100644
index 0000000000000..27fc9df8d796a
--- /dev/null
+++ b/compiler/rustc_errors/src/timings.rs
@@ -0,0 +1,80 @@
+use std::time::Instant;
+
+use crate::DiagCtxtHandle;
+
+/// A high-level section of the compilation process.
+#[derive(Copy, Clone, Debug)]
+pub enum TimingSection {
+    /// Time spent linking.
+    Linking,
+}
+
+/// Section with attached timestamp
+#[derive(Copy, Clone, Debug)]
+pub struct TimingRecord {
+    pub section: TimingSection,
+    /// Microseconds elapsed since some predetermined point in time (~start of the rustc process).
+    pub timestamp: u128,
+}
+
+impl TimingRecord {
+    fn from_origin(origin: Instant, section: TimingSection) -> Self {
+        Self { section, timestamp: Instant::now().duration_since(origin).as_micros() }
+    }
+
+    pub fn section(&self) -> TimingSection {
+        self.section
+    }
+
+    pub fn timestamp(&self) -> u128 {
+        self.timestamp
+    }
+}
+
+/// Manages emission of start/end section timings, enabled through `--json=timings`.
+pub struct TimingSectionHandler {
+    /// Time when the compilation session started.
+    /// If `None`, timing is disabled.
+    origin: Option<Instant>,
+}
+
+impl TimingSectionHandler {
+    pub fn new(enabled: bool) -> Self {
+        let origin = if enabled { Some(Instant::now()) } else { None };
+        Self { origin }
+    }
+
+    /// Returns a RAII guard that will immediately emit a start the provided section, and then emit
+    /// its end when it is dropped.
+    pub fn start_section<'a>(
+        &self,
+        diag_ctxt: DiagCtxtHandle<'a>,
+        section: TimingSection,
+    ) -> TimingSectionGuard<'a> {
+        TimingSectionGuard::create(diag_ctxt, section, self.origin)
+    }
+}
+
+/// RAII wrapper for starting and ending section timings.
+pub struct TimingSectionGuard<'a> {
+    dcx: DiagCtxtHandle<'a>,
+    section: TimingSection,
+    origin: Option<Instant>,
+}
+
+impl<'a> TimingSectionGuard<'a> {
+    fn create(dcx: DiagCtxtHandle<'a>, section: TimingSection, origin: Option<Instant>) -> Self {
+        if let Some(origin) = origin {
+            dcx.emit_timing_section_start(TimingRecord::from_origin(origin, section));
+        }
+        Self { dcx, section, origin }
+    }
+}
+
+impl<'a> Drop for TimingSectionGuard<'a> {
+    fn drop(&mut self) {
+        if let Some(origin) = self.origin {
+            self.dcx.emit_timing_section_end(TimingRecord::from_origin(origin, self.section));
+        }
+    }
+}
diff --git a/compiler/rustc_feature/src/accepted.rs b/compiler/rustc_feature/src/accepted.rs
index b1c185220f45b..cfe0f4e5d6cb6 100644
--- a/compiler/rustc_feature/src/accepted.rs
+++ b/compiler/rustc_feature/src/accepted.rs
@@ -220,6 +220,8 @@ declare_features! (
     (accepted, fn_must_use, "1.27.0", Some(43302)),
     /// Allows capturing variables in scope using format_args!
     (accepted, format_args_capture, "1.58.0", Some(67984)),
+    /// Infer generic args for both consts and types.
+    (accepted, generic_arg_infer, "CURRENT_RUSTC_VERSION", Some(85077)),
     /// Allows associated types to be generic, e.g., `type Foo<T>;` (RFC 1598).
     (accepted, generic_associated_types, "1.65.0", Some(44265)),
     /// Allows attributes on lifetime/type formal parameters in generics (RFC 1327).
diff --git a/compiler/rustc_feature/src/unstable.rs b/compiler/rustc_feature/src/unstable.rs
index 5e42b919f9d9c..a7bc6207149f5 100644
--- a/compiler/rustc_feature/src/unstable.rs
+++ b/compiler/rustc_feature/src/unstable.rs
@@ -520,8 +520,6 @@ declare_features! (
     (unstable, frontmatter, "1.88.0", Some(136889)),
     /// Allows defining gen blocks and `gen fn`.
     (unstable, gen_blocks, "1.75.0", Some(117078)),
-    /// Infer generic args for both consts and types.
-    (unstable, generic_arg_infer, "1.55.0", Some(85077)),
     /// Allows non-trivial generic constants which have to have wfness manually propagated to callers
     (incomplete, generic_const_exprs, "1.56.0", Some(76560)),
     /// Allows generic parameters and where-clauses on free & associated const items.
diff --git a/compiler/rustc_hir_analysis/messages.ftl b/compiler/rustc_hir_analysis/messages.ftl
index f768bd157abc8..bd2252c1bf8fd 100644
--- a/compiler/rustc_hir_analysis/messages.ftl
+++ b/compiler/rustc_hir_analysis/messages.ftl
@@ -46,6 +46,9 @@ hir_analysis_associated_type_trait_uninferred_generic_params = cannot use the {$
 
 hir_analysis_associated_type_trait_uninferred_generic_params_multipart_suggestion = use a fully qualified path with explicit lifetimes
 
+hir_analysis_async_drop_without_sync_drop = `AsyncDrop` impl without `Drop` impl
+    .help = type implementing `AsyncDrop` trait must also implement `Drop` trait to be used in sync context and unwinds
+
 hir_analysis_auto_deref_reached_recursion_limit = reached the recursion limit while auto-dereferencing `{$ty}`
     .label = deref recursion limit reached
     .help = consider increasing the recursion limit by adding a `#![recursion_limit = "{$suggested_limit}"]` attribute to your crate (`{$crate_name}`)
diff --git a/compiler/rustc_hir_analysis/src/check/mod.rs b/compiler/rustc_hir_analysis/src/check/mod.rs
index 5b8aa28102c70..ca24d5a6424d2 100644
--- a/compiler/rustc_hir_analysis/src/check/mod.rs
+++ b/compiler/rustc_hir_analysis/src/check/mod.rs
@@ -114,7 +114,15 @@ pub fn provide(providers: &mut Providers) {
 }
 
 fn adt_destructor(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Option<ty::Destructor> {
-    tcx.calculate_dtor(def_id, always_applicable::check_drop_impl)
+    let dtor = tcx.calculate_dtor(def_id, always_applicable::check_drop_impl);
+    if dtor.is_none() && tcx.features().async_drop() {
+        if let Some(async_dtor) = adt_async_destructor(tcx, def_id) {
+            // When type has AsyncDrop impl, but doesn't have Drop impl, generate error
+            let span = tcx.def_span(async_dtor.impl_did);
+            tcx.dcx().emit_err(errors::AsyncDropWithoutSyncDrop { span });
+        }
+    }
+    dtor
 }
 
 fn adt_async_destructor(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Option<ty::AsyncDestructor> {
diff --git a/compiler/rustc_hir_analysis/src/collect/type_of.rs b/compiler/rustc_hir_analysis/src/collect/type_of.rs
index 141d96b57e579..902a2e15dffde 100644
--- a/compiler/rustc_hir_analysis/src/collect/type_of.rs
+++ b/compiler/rustc_hir_analysis/src/collect/type_of.rs
@@ -452,13 +452,6 @@ fn infer_placeholder_type<'tcx>(
             if let Some(ty) = node.ty() {
                 visitor.visit_ty_unambig(ty);
             }
-            // If we have just one span, let's try to steal a const `_` feature error.
-            let try_steal_span = if !tcx.features().generic_arg_infer() && visitor.spans.len() == 1
-            {
-                visitor.spans.first().copied()
-            } else {
-                None
-            };
             // If we didn't find any infer tys, then just fallback to `span`.
             if visitor.spans.is_empty() {
                 visitor.spans.push(span);
@@ -489,15 +482,7 @@ fn infer_placeholder_type<'tcx>(
                 }
             }
 
-            if let Some(try_steal_span) = try_steal_span {
-                cx.dcx().try_steal_replace_and_emit_err(
-                    try_steal_span,
-                    StashKey::UnderscoreForArrayLengths,
-                    diag,
-                )
-            } else {
-                diag.emit()
-            }
+            diag.emit()
         });
     Ty::new_error(tcx, guar)
 }
diff --git a/compiler/rustc_hir_analysis/src/errors.rs b/compiler/rustc_hir_analysis/src/errors.rs
index 8de2aec95a7b2..318aaab50f4d4 100644
--- a/compiler/rustc_hir_analysis/src/errors.rs
+++ b/compiler/rustc_hir_analysis/src/errors.rs
@@ -1712,3 +1712,11 @@ pub(crate) struct AbiCustomClothedFunction {
     )]
     pub naked_span: Span,
 }
+
+#[derive(Diagnostic)]
+#[diag(hir_analysis_async_drop_without_sync_drop)]
+#[help]
+pub(crate) struct AsyncDropWithoutSyncDrop {
+    #[primary_span]
+    pub span: Span,
+}
diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/generics.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/generics.rs
index 3a26b8331f8b3..8c7c3750865cf 100644
--- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/generics.rs
+++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/generics.rs
@@ -8,7 +8,7 @@ use rustc_middle::ty::{
     self, GenericArgsRef, GenericParamDef, GenericParamDefKind, IsSuggestable, Ty,
 };
 use rustc_session::lint::builtin::LATE_BOUND_LIFETIME_ARGUMENTS;
-use rustc_span::{kw, sym};
+use rustc_span::kw;
 use smallvec::SmallVec;
 use tracing::{debug, instrument};
 
@@ -258,19 +258,6 @@ pub fn lower_generic_args<'tcx: 'a, 'a>(
                             GenericParamDefKind::Const { .. },
                             _,
                         ) => {
-                            if let GenericParamDefKind::Const { .. } = param.kind
-                                && let GenericArg::Infer(inf) = arg
-                                && !tcx.features().generic_arg_infer()
-                            {
-                                rustc_session::parse::feature_err(
-                                    tcx.sess,
-                                    sym::generic_arg_infer,
-                                    inf.span,
-                                    "const arguments cannot yet be inferred with `_`",
-                                )
-                                .emit();
-                            }
-
                             // We lower to an infer even when the feature gate is not enabled
                             // as it is useful for diagnostics to be able to see a `ConstKind::Infer`
                             args.push(ctx.provided_kind(&args, param, arg));
diff --git a/compiler/rustc_hir_typeck/src/op.rs b/compiler/rustc_hir_typeck/src/op.rs
index 7f7921b66b572..b9d245069866a 100644
--- a/compiler/rustc_hir_typeck/src/op.rs
+++ b/compiler/rustc_hir_typeck/src/op.rs
@@ -706,7 +706,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                         .sess
                         .source_map()
                         .span_to_snippet(lhs_expr.span)
-                        .unwrap_or("_".to_string()),
+                        .unwrap_or_else(|_| "_".to_string()),
                 };
 
                 if op.span().can_be_used_for_suggestions() {
diff --git a/compiler/rustc_interface/src/queries.rs b/compiler/rustc_interface/src/queries.rs
index 9a474b910f686..877440ec7d2cb 100644
--- a/compiler/rustc_interface/src/queries.rs
+++ b/compiler/rustc_interface/src/queries.rs
@@ -4,6 +4,7 @@ use std::sync::Arc;
 use rustc_codegen_ssa::CodegenResults;
 use rustc_codegen_ssa::traits::CodegenBackend;
 use rustc_data_structures::svh::Svh;
+use rustc_errors::timings::TimingSection;
 use rustc_hir::def_id::LOCAL_CRATE;
 use rustc_metadata::EncodedMetadata;
 use rustc_middle::dep_graph::DepGraph;
@@ -88,6 +89,7 @@ impl Linker {
         }
 
         let _timer = sess.prof.verbose_generic_activity("link_crate");
+        let _timing = sess.timings.start_section(sess.dcx(), TimingSection::Linking);
         codegen_backend.link(sess, codegen_results, self.metadata, &self.output_filenames)
     }
 }
diff --git a/compiler/rustc_interface/src/tests.rs b/compiler/rustc_interface/src/tests.rs
index 82823581c1210..a0012b04c4f29 100644
--- a/compiler/rustc_interface/src/tests.rs
+++ b/compiler/rustc_interface/src/tests.rs
@@ -802,6 +802,7 @@ fn test_unstable_options_tracking_hash() {
     tracked!(force_unstable_if_unmarked, true);
     tracked!(function_return, FunctionReturn::ThunkExtern);
     tracked!(function_sections, Some(false));
+    tracked!(hint_mostly_unused, true);
     tracked!(human_readable_cgu_names, true);
     tracked!(incremental_ignore_spans, true);
     tracked!(inline_mir, Some(true));
diff --git a/compiler/rustc_metadata/src/locator.rs b/compiler/rustc_metadata/src/locator.rs
index 79015aab5d304..259bcb1b96dbb 100644
--- a/compiler/rustc_metadata/src/locator.rs
+++ b/compiler/rustc_metadata/src/locator.rs
@@ -1196,7 +1196,7 @@ impl CrateError {
                             .opts
                             .crate_name
                             .clone()
-                            .unwrap_or("<unknown>".to_string()),
+                            .unwrap_or_else(|| "<unknown>".to_string()),
                         is_nightly_build: sess.is_nightly_build(),
                         profiler_runtime: Symbol::intern(&sess.opts.unstable_opts.profiler_runtime),
                         locator_triple: locator.triple,
@@ -1217,7 +1217,11 @@ impl CrateError {
                     crate_name,
                     add_info: String::new(),
                     missing_core,
-                    current_crate: sess.opts.crate_name.clone().unwrap_or("<unknown>".to_string()),
+                    current_crate: sess
+                        .opts
+                        .crate_name
+                        .clone()
+                        .unwrap_or_else(|| "<unknown>".to_string()),
                     is_nightly_build: sess.is_nightly_build(),
                     profiler_runtime: Symbol::intern(&sess.opts.unstable_opts.profiler_runtime),
                     locator_triple: sess.opts.target_triple.clone(),
diff --git a/compiler/rustc_metadata/src/native_libs.rs b/compiler/rustc_metadata/src/native_libs.rs
index 5cdeb8935f70c..f10d71f4c6540 100644
--- a/compiler/rustc_metadata/src/native_libs.rs
+++ b/compiler/rustc_metadata/src/native_libs.rs
@@ -705,7 +705,7 @@ impl<'tcx> Collector<'tcx> {
             .map_or(import_name_type, |ord| Some(PeImportNameType::Ordinal(ord)));
 
         DllImport {
-            name: codegen_fn_attrs.link_name.unwrap_or(self.tcx.item_name(item)),
+            name: codegen_fn_attrs.link_name.unwrap_or_else(|| self.tcx.item_name(item)),
             import_name_type,
             calling_convention,
             span,
diff --git a/compiler/rustc_middle/src/query/mod.rs b/compiler/rustc_middle/src/query/mod.rs
index 930d9fba43391..3668f4e12f5d9 100644
--- a/compiler/rustc_middle/src/query/mod.rs
+++ b/compiler/rustc_middle/src/query/mod.rs
@@ -1576,7 +1576,7 @@ rustc_queries! {
     query vtable_allocation(key: (Ty<'tcx>, Option<ty::ExistentialTraitRef<'tcx>>)) -> mir::interpret::AllocId {
         desc { |tcx| "vtable const allocation for <{} as {}>",
             key.0,
-            key.1.map(|trait_ref| format!("{trait_ref}")).unwrap_or("_".to_owned())
+            key.1.map(|trait_ref| format!("{trait_ref}")).unwrap_or_else(|| "_".to_owned())
         }
     }
 
diff --git a/compiler/rustc_mir_transform/src/cross_crate_inline.rs b/compiler/rustc_mir_transform/src/cross_crate_inline.rs
index 727d4a126d21e..6d7b7e10ef697 100644
--- a/compiler/rustc_mir_transform/src/cross_crate_inline.rs
+++ b/compiler/rustc_mir_transform/src/cross_crate_inline.rs
@@ -50,6 +50,13 @@ fn cross_crate_inlinable(tcx: TyCtxt<'_>, def_id: LocalDefId) -> bool {
         _ => {}
     }
 
+    // If the crate is likely to be mostly unused, use cross-crate inlining to defer codegen until
+    // the function is referenced, in order to skip codegen for unused functions. This is
+    // intentionally after the check for `inline(never)`, so that `inline(never)` wins.
+    if tcx.sess.opts.unstable_opts.hint_mostly_unused {
+        return true;
+    }
+
     let sig = tcx.fn_sig(def_id).instantiate_identity();
     for ty in sig.inputs().skip_binder().iter().chain(std::iter::once(&sig.output().skip_binder()))
     {
diff --git a/compiler/rustc_passes/src/check_export.rs b/compiler/rustc_passes/src/check_export.rs
index b9a3849f32fec..f8f489d7d0673 100644
--- a/compiler/rustc_passes/src/check_export.rs
+++ b/compiler/rustc_passes/src/check_export.rs
@@ -53,11 +53,11 @@ impl<'tcx> ExportableItemCollector<'tcx> {
         let is_pub = visibilities.is_directly_public(def_id);
 
         if has_attr && !is_pub {
-            let vis = visibilities.effective_vis(def_id).cloned().unwrap_or(
+            let vis = visibilities.effective_vis(def_id).cloned().unwrap_or_else(|| {
                 EffectiveVisibility::from_vis(Visibility::Restricted(
                     self.tcx.parent_module_from_def_id(def_id).to_local_def_id(),
-                )),
-            );
+                ))
+            });
             let vis = vis.at_level(Level::Direct);
             let span = self.tcx.def_span(def_id);
 
diff --git a/compiler/rustc_session/src/config.rs b/compiler/rustc_session/src/config.rs
index 04ca0b75c3113..19db01585e3e6 100644
--- a/compiler/rustc_session/src/config.rs
+++ b/compiler/rustc_session/src/config.rs
@@ -1366,6 +1366,7 @@ impl Default for Options {
             real_rust_source_base_dir: None,
             edition: DEFAULT_EDITION,
             json_artifact_notifications: false,
+            json_timings: false,
             json_unused_externs: JsonUnusedExterns::No,
             json_future_incompat: false,
             pretty: None,
@@ -1880,6 +1881,9 @@ pub struct JsonConfig {
     pub json_rendered: HumanReadableErrorType,
     pub json_color: ColorConfig,
     json_artifact_notifications: bool,
+    /// Output start and end timestamps of several high-level compilation sections
+    /// (frontend, backend, linker).
+    json_timings: bool,
     pub json_unused_externs: JsonUnusedExterns,
     json_future_incompat: bool,
 }
@@ -1921,6 +1925,7 @@ pub fn parse_json(early_dcx: &EarlyDiagCtxt, matches: &getopts::Matches) -> Json
     let mut json_artifact_notifications = false;
     let mut json_unused_externs = JsonUnusedExterns::No;
     let mut json_future_incompat = false;
+    let mut json_timings = false;
     for option in matches.opt_strs("json") {
         // For now conservatively forbid `--color` with `--json` since `--json`
         // won't actually be emitting any colors and anything colorized is
@@ -1937,6 +1942,7 @@ pub fn parse_json(early_dcx: &EarlyDiagCtxt, matches: &getopts::Matches) -> Json
                 }
                 "diagnostic-rendered-ansi" => json_color = ColorConfig::Always,
                 "artifacts" => json_artifact_notifications = true,
+                "timings" => json_timings = true,
                 "unused-externs" => json_unused_externs = JsonUnusedExterns::Loud,
                 "unused-externs-silent" => json_unused_externs = JsonUnusedExterns::Silent,
                 "future-incompat" => json_future_incompat = true,
@@ -1949,6 +1955,7 @@ pub fn parse_json(early_dcx: &EarlyDiagCtxt, matches: &getopts::Matches) -> Json
         json_rendered,
         json_color,
         json_artifact_notifications,
+        json_timings,
         json_unused_externs,
         json_future_incompat,
     }
@@ -2476,6 +2483,7 @@ pub fn build_session_options(early_dcx: &mut EarlyDiagCtxt, matches: &getopts::M
         json_rendered,
         json_color,
         json_artifact_notifications,
+        json_timings,
         json_unused_externs,
         json_future_incompat,
     } = parse_json(early_dcx, matches);
@@ -2497,6 +2505,10 @@ pub fn build_session_options(early_dcx: &mut EarlyDiagCtxt, matches: &getopts::M
     let mut unstable_opts = UnstableOptions::build(early_dcx, matches, &mut target_modifiers);
     let (lint_opts, describe_lints, lint_cap) = get_cmd_lint_options(early_dcx, matches);
 
+    if !unstable_opts.unstable_options && json_timings {
+        early_dcx.early_fatal("--json=timings is unstable and requires using `-Zunstable-options`");
+    }
+
     check_error_format_stability(early_dcx, &unstable_opts, error_format);
 
     let output_types = parse_output_types(early_dcx, &unstable_opts, matches);
@@ -2774,6 +2786,7 @@ pub fn build_session_options(early_dcx: &mut EarlyDiagCtxt, matches: &getopts::M
         real_rust_source_base_dir,
         edition,
         json_artifact_notifications,
+        json_timings,
         json_unused_externs,
         json_future_incompat,
         pretty,
diff --git a/compiler/rustc_session/src/filesearch.rs b/compiler/rustc_session/src/filesearch.rs
index def2cc97f061f..4f8c3926207f3 100644
--- a/compiler/rustc_session/src/filesearch.rs
+++ b/compiler/rustc_session/src/filesearch.rs
@@ -209,10 +209,9 @@ pub fn get_or_default_sysroot() -> PathBuf {
         //
         // use `parent` twice to chop off the file name and then also the
         // directory containing the dll
-        let dir = dll.parent().and_then(|p| p.parent()).ok_or(format!(
-            "Could not move 2 levels upper using `parent()` on {}",
-            dll.display()
-        ))?;
+        let dir = dll.parent().and_then(|p| p.parent()).ok_or_else(|| {
+            format!("Could not move 2 levels upper using `parent()` on {}", dll.display())
+        })?;
 
         // if `dir` points to target's dir, move up to the sysroot
         let mut sysroot_dir = if dir.ends_with(crate::config::host_tuple()) {
@@ -265,5 +264,6 @@ pub fn get_or_default_sysroot() -> PathBuf {
         rustlib_path.exists().then_some(p)
     }
 
-    from_env_args_next().unwrap_or(default_from_rustc_driver_dll().expect("Failed finding sysroot"))
+    from_env_args_next()
+        .unwrap_or_else(|| default_from_rustc_driver_dll().expect("Failed finding sysroot"))
 }
diff --git a/compiler/rustc_session/src/options.rs b/compiler/rustc_session/src/options.rs
index 9ca405333f43d..d22f9de6525d8 100644
--- a/compiler/rustc_session/src/options.rs
+++ b/compiler/rustc_session/src/options.rs
@@ -410,6 +410,10 @@ top_level_options!(
         /// by the compiler.
         json_artifact_notifications: bool [TRACKED],
 
+        /// `true` if we're emitting JSON timings with the start and end of
+        /// high-level compilation sections
+        json_timings: bool [UNTRACKED],
+
         /// `true` if we're emitting a JSON blob containing the unused externs
         json_unused_externs: JsonUnusedExterns [UNTRACKED],
 
@@ -2235,6 +2239,8 @@ options! {
         environment variable `RUSTC_GRAPHVIZ_FONT` (default: `Courier, monospace`)"),
     has_thread_local: Option<bool> = (None, parse_opt_bool, [TRACKED],
         "explicitly enable the `cfg(target_thread_local)` directive"),
+    hint_mostly_unused: bool = (false, parse_bool, [TRACKED],
+        "hint that most of this crate will go unused, to minimize work for uncalled functions"),
     human_readable_cgu_names: bool = (false, parse_bool, [TRACKED],
         "generate human-readable, predictable names for codegen units (default: no)"),
     identify_regions: bool = (false, parse_bool, [UNTRACKED],
diff --git a/compiler/rustc_session/src/session.rs b/compiler/rustc_session/src/session.rs
index b8b4518b14e29..ca42c5a425660 100644
--- a/compiler/rustc_session/src/session.rs
+++ b/compiler/rustc_session/src/session.rs
@@ -18,6 +18,7 @@ use rustc_errors::emitter::{
     DynEmitter, HumanEmitter, HumanReadableErrorType, OutputTheme, stderr_destination,
 };
 use rustc_errors::json::JsonEmitter;
+use rustc_errors::timings::TimingSectionHandler;
 use rustc_errors::{
     Diag, DiagCtxt, DiagCtxtHandle, DiagMessage, Diagnostic, ErrorGuaranteed, FatalAbort,
     FluentBundle, LazyFallbackBundle, TerminalUrl, fallback_fluent_bundle,
@@ -156,6 +157,9 @@ pub struct Session {
     /// Used by `-Z self-profile`.
     pub prof: SelfProfilerRef,
 
+    /// Used to emit section timings events (enabled by `--json=timings`).
+    pub timings: TimingSectionHandler,
+
     /// Data about code being compiled, gathered during compilation.
     pub code_stats: CodeStats,
 
@@ -1126,6 +1130,8 @@ pub fn build_session(
         .as_ref()
         .map(|_| rng().next_u32().to_base_fixed_len(CASE_INSENSITIVE).to_string());
 
+    let timings = TimingSectionHandler::new(sopts.json_timings);
+
     let sess = Session {
         target,
         host,
@@ -1136,6 +1142,7 @@ pub fn build_session(
         io,
         incr_comp_session: RwLock::new(IncrCompSession::NotInitialized),
         prof,
+        timings,
         code_stats: Default::default(),
         lint_store: None,
         driver_lint_caps,
diff --git a/compiler/rustc_trait_selection/src/error_reporting/infer/region.rs b/compiler/rustc_trait_selection/src/error_reporting/infer/region.rs
index b8207c4f81632..5c669678ccc0c 100644
--- a/compiler/rustc_trait_selection/src/error_reporting/infer/region.rs
+++ b/compiler/rustc_trait_selection/src/error_reporting/infer/region.rs
@@ -891,7 +891,7 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
             (b'a'..=b'z')
                 .map(|c| format!("'{}", c as char))
                 .find(|candidate| !used_names.iter().any(|e| e.as_str() == candidate))
-                .unwrap_or("'lt".to_string())
+                .unwrap_or_else(|| "'lt".to_string())
         };
 
         let mut visitor = LifetimeReplaceVisitor {
diff --git a/compiler/rustc_trait_selection/src/traits/normalize.rs b/compiler/rustc_trait_selection/src/traits/normalize.rs
index 35a43b294ee04..9e02ce32b21cd 100644
--- a/compiler/rustc_trait_selection/src/traits/normalize.rs
+++ b/compiler/rustc_trait_selection/src/traits/normalize.rs
@@ -224,7 +224,7 @@ impl<'a, 'b, 'tcx> AssocTypeNormalizer<'a, 'b, 'tcx> {
             )
             .ok()
             .flatten()
-            .unwrap_or(proj.to_term(infcx.tcx));
+            .unwrap_or_else(|| proj.to_term(infcx.tcx));
 
             PlaceholderReplacer::replace_placeholders(
                 infcx,
diff --git a/compiler/rustc_ty_utils/src/layout.rs b/compiler/rustc_ty_utils/src/layout.rs
index 9774263e4c951..d52228224614b 100644
--- a/compiler/rustc_ty_utils/src/layout.rs
+++ b/compiler/rustc_ty_utils/src/layout.rs
@@ -896,10 +896,9 @@ fn variant_info_for_coroutine<'tcx>(
                     variant_size = variant_size.max(offset + field_layout.size);
                     FieldInfo {
                         kind: FieldKind::CoroutineLocal,
-                        name: field_name.unwrap_or(Symbol::intern(&format!(
-                            ".coroutine_field{}",
-                            local.as_usize()
-                        ))),
+                        name: field_name.unwrap_or_else(|| {
+                            Symbol::intern(&format!(".coroutine_field{}", local.as_usize()))
+                        }),
                         offset: offset.bytes(),
                         size: field_layout.size.bytes(),
                         align: field_layout.align.abi.bytes(),
diff --git a/library/core/src/lib.rs b/library/core/src/lib.rs
index 88855831788db..6231c3425c880 100644
--- a/library/core/src/lib.rs
+++ b/library/core/src/lib.rs
@@ -153,7 +153,6 @@
 #![feature(f16)]
 #![feature(freeze_impls)]
 #![feature(fundamental)]
-#![feature(generic_arg_infer)]
 #![feature(if_let_guard)]
 #![feature(intra_doc_pointers)]
 #![feature(intrinsics)]
diff --git a/src/bootstrap/src/core/build_steps/compile.rs b/src/bootstrap/src/core/build_steps/compile.rs
index 52f421b478235..f6efb23e8d86d 100644
--- a/src/bootstrap/src/core/build_steps/compile.rs
+++ b/src/bootstrap/src/core/build_steps/compile.rs
@@ -24,7 +24,8 @@ use crate::core::build_steps::tool::SourceType;
 use crate::core::build_steps::{dist, llvm};
 use crate::core::builder;
 use crate::core::builder::{
-    Builder, Cargo, Kind, PathSet, RunConfig, ShouldRun, Step, TaskPath, crate_description,
+    Builder, Cargo, Kind, PathSet, RunConfig, ShouldRun, Step, StepMetadata, TaskPath,
+    crate_description,
 };
 use crate::core::config::{DebuginfoLevel, LlvmLibunwind, RustcLto, TargetSelection};
 use crate::utils::build_stamp;
@@ -305,6 +306,14 @@ impl Step for Std {
             builder.compiler(compiler.stage, builder.config.host_target),
         ));
     }
+
+    fn metadata(&self) -> Option<StepMetadata> {
+        Some(
+            StepMetadata::build("std", self.target)
+                .built_by(self.compiler)
+                .stage(self.compiler.stage),
+        )
+    }
 }
 
 fn copy_and_stamp(
@@ -1171,6 +1180,14 @@ impl Step for Rustc {
 
         build_compiler.stage
     }
+
+    fn metadata(&self) -> Option<StepMetadata> {
+        Some(
+            StepMetadata::build("rustc", self.target)
+                .built_by(self.build_compiler)
+                .stage(self.build_compiler.stage + 1),
+        )
+    }
 }
 
 pub fn rustc_cargo(
diff --git a/src/bootstrap/src/core/build_steps/llvm.rs b/src/bootstrap/src/core/build_steps/llvm.rs
index 8f2f143c352f0..de67a5f77e643 100644
--- a/src/bootstrap/src/core/build_steps/llvm.rs
+++ b/src/bootstrap/src/core/build_steps/llvm.rs
@@ -18,7 +18,7 @@ use build_helper::git::PathFreshness;
 #[cfg(feature = "tracing")]
 use tracing::instrument;
 
-use crate::core::builder::{Builder, RunConfig, ShouldRun, Step};
+use crate::core::builder::{Builder, RunConfig, ShouldRun, Step, StepMetadata};
 use crate::core::config::{Config, TargetSelection};
 use crate::utils::build_stamp::{BuildStamp, generate_smart_stamp_hash};
 use crate::utils::exec::command;
@@ -582,6 +582,10 @@ impl Step for Llvm {
 
         res
     }
+
+    fn metadata(&self) -> Option<StepMetadata> {
+        Some(StepMetadata::build("llvm", self.target))
+    }
 }
 
 pub fn get_llvm_version(builder: &Builder<'_>, llvm_config: &Path) -> String {
diff --git a/src/bootstrap/src/core/builder/mod.rs b/src/bootstrap/src/core/builder/mod.rs
index 7433f0b0f3b44..b26f47a3171a7 100644
--- a/src/bootstrap/src/core/builder/mod.rs
+++ b/src/bootstrap/src/core/builder/mod.rs
@@ -130,6 +130,38 @@ pub trait Step: 'static + Clone + Debug + PartialEq + Eq + Hash {
         // as such calling them from ./x.py isn't logical.
         unimplemented!()
     }
+
+    /// Returns metadata of the step, for tests
+    fn metadata(&self) -> Option<StepMetadata> {
+        None
+    }
+}
+
+/// Metadata that describes an executed step, mostly for testing and tracing.
+#[allow(unused)]
+#[derive(Debug)]
+pub struct StepMetadata {
+    name: &'static str,
+    kind: Kind,
+    target: TargetSelection,
+    built_by: Option<Compiler>,
+    stage: Option<u32>,
+}
+
+impl StepMetadata {
+    pub fn build(name: &'static str, target: TargetSelection) -> Self {
+        Self { name, kind: Kind::Build, target, built_by: None, stage: None }
+    }
+
+    pub fn built_by(mut self, compiler: Compiler) -> Self {
+        self.built_by = Some(compiler);
+        self
+    }
+
+    pub fn stage(mut self, stage: u32) -> Self {
+        self.stage = Some(stage);
+        self
+    }
 }
 
 pub struct RunConfig<'a> {
diff --git a/src/bootstrap/src/core/builder/tests.rs b/src/bootstrap/src/core/builder/tests.rs
index d07df7f4a841d..6268a2b59d6cc 100644
--- a/src/bootstrap/src/core/builder/tests.rs
+++ b/src/bootstrap/src/core/builder/tests.rs
@@ -8,6 +8,7 @@ use super::*;
 use crate::Flags;
 use crate::core::build_steps::doc::DocumentationFormat;
 use crate::core::config::Config;
+use crate::utils::cache::ExecutedStep;
 use crate::utils::tests::git::{GitCtx, git_test};
 
 static TEST_TRIPLE_1: &str = "i686-unknown-haiku";
@@ -1258,31 +1259,24 @@ mod staging {
 /// Renders the executed bootstrap steps for usage in snapshot tests with insta.
 /// Only renders certain important steps.
 /// Each value in `steps` should be a tuple of (Step, step output).
-fn render_steps(steps: &[(Box<dyn Any>, Box<dyn Any>)]) -> String {
+fn render_steps(steps: &[ExecutedStep]) -> String {
     steps
         .iter()
-        .filter_map(|(step, output)| {
-            // FIXME: implement an optional method on Step to produce metadata for test, instead
-            // of this downcasting
-            if let Some((rustc, output)) = downcast_step::<compile::Rustc>(step, output) {
-                Some(format!(
-                    "[build] {} -> {}",
-                    render_compiler(rustc.build_compiler),
-                    // FIXME: return the correct stage from the `Rustc` step, now it behaves weirdly
-                    render_compiler(Compiler::new(rustc.build_compiler.stage + 1, rustc.target)),
-                ))
-            } else if let Some((std, output)) = downcast_step::<compile::Std>(step, output) {
-                Some(format!(
-                    "[build] {} -> std {} <{}>",
-                    render_compiler(std.compiler),
-                    std.compiler.stage,
-                    std.target
-                ))
-            } else if let Some((llvm, output)) = downcast_step::<llvm::Llvm>(step, output) {
-                Some(format!("[build] llvm <{}>", llvm.target))
-            } else {
-                None
+        .filter_map(|step| {
+            use std::fmt::Write;
+
+            let Some(metadata) = &step.metadata else {
+                return None;
+            };
+
+            let mut record = format!("[{}] ", metadata.kind.as_str());
+            if let Some(compiler) = metadata.built_by {
+                write!(record, "{} -> ", render_compiler(compiler));
             }
+            let stage =
+                if let Some(stage) = metadata.stage { format!("{stage} ") } else { "".to_string() };
+            write!(record, "{} {stage}<{}>", metadata.name, metadata.target);
+            Some(record)
         })
         .map(|line| {
             line.replace(TEST_TRIPLE_1, "target1")
@@ -1293,19 +1287,6 @@ fn render_steps(steps: &[(Box<dyn Any>, Box<dyn Any>)]) -> String {
         .join("\n")
 }
 
-fn downcast_step<'a, S: Step>(
-    step: &'a Box<dyn Any>,
-    output: &'a Box<dyn Any>,
-) -> Option<(&'a S, &'a S::Output)> {
-    let Some(step) = step.downcast_ref::<S>() else {
-        return None;
-    };
-    let Some(output) = output.downcast_ref::<S::Output>() else {
-        return None;
-    };
-    Some((step, output))
-}
-
 fn render_compiler(compiler: Compiler) -> String {
     format!("rustc {} <{}>", compiler.stage, compiler.host)
 }
diff --git a/src/bootstrap/src/core/config/config.rs b/src/bootstrap/src/core/config/config.rs
index f9980ac5fe125..ff0fda2d2e698 100644
--- a/src/bootstrap/src/core/config/config.rs
+++ b/src/bootstrap/src/core/config/config.rs
@@ -392,27 +392,69 @@ impl Config {
         )
     )]
     pub(crate) fn parse_inner(
-        mut flags: Flags,
+        flags: Flags,
         get_toml: impl Fn(&Path) -> Result<TomlConfig, toml::de::Error>,
     ) -> Config {
+        // Destructure flags to ensure that we use all its fields
+        // The field variables are prefixed with `flags_` to avoid clashes
+        // with values from TOML config files with same names.
+        let Flags {
+            cmd: flags_cmd,
+            verbose: flags_verbose,
+            incremental: flags_incremental,
+            config: flags_config,
+            build_dir: flags_build_dir,
+            build: flags_build,
+            host: flags_host,
+            target: flags_target,
+            exclude: flags_exclude,
+            skip: flags_skip,
+            include_default_paths: flags_include_default_paths,
+            rustc_error_format: flags_rustc_error_format,
+            on_fail: flags_on_fail,
+            dry_run: flags_dry_run,
+            dump_bootstrap_shims: flags_dump_bootstrap_shims,
+            stage: flags_stage,
+            keep_stage: flags_keep_stage,
+            keep_stage_std: flags_keep_stage_std,
+            src: flags_src,
+            jobs: flags_jobs,
+            warnings: flags_warnings,
+            json_output: flags_json_output,
+            color: flags_color,
+            bypass_bootstrap_lock: flags_bypass_bootstrap_lock,
+            rust_profile_generate: flags_rust_profile_generate,
+            rust_profile_use: flags_rust_profile_use,
+            llvm_profile_use: flags_llvm_profile_use,
+            llvm_profile_generate: flags_llvm_profile_generate,
+            enable_bolt_settings: flags_enable_bolt_settings,
+            skip_stage0_validation: flags_skip_stage0_validation,
+            reproducible_artifact: flags_reproducible_artifact,
+            paths: mut flags_paths,
+            set: flags_set,
+            free_args: mut flags_free_args,
+            ci: flags_ci,
+            skip_std_check_if_no_download_rustc: flags_skip_std_check_if_no_download_rustc,
+        } = flags;
+
         let mut config = Config::default_opts();
         let mut exec_ctx = ExecutionContext::new();
-        exec_ctx.set_verbose(flags.verbose);
-        exec_ctx.set_fail_fast(flags.cmd.fail_fast());
+        exec_ctx.set_verbose(flags_verbose);
+        exec_ctx.set_fail_fast(flags_cmd.fail_fast());
 
         config.exec_ctx = exec_ctx;
 
         // Set flags.
-        config.paths = std::mem::take(&mut flags.paths);
+        config.paths = std::mem::take(&mut flags_paths);
 
         #[cfg(feature = "tracing")]
         span!(
             target: "CONFIG_HANDLING",
             tracing::Level::TRACE,
             "collecting paths and path exclusions",
-            "flags.paths" = ?flags.paths,
-            "flags.skip" = ?flags.skip,
-            "flags.exclude" = ?flags.exclude
+            "flags.paths" = ?flags_paths,
+            "flags.skip" = ?flags_skip,
+            "flags.exclude" = ?flags_exclude
         );
 
         #[cfg(feature = "tracing")]
@@ -423,28 +465,28 @@ impl Config {
             "config.skip" = ?config.skip,
         );
 
-        config.include_default_paths = flags.include_default_paths;
-        config.rustc_error_format = flags.rustc_error_format;
-        config.json_output = flags.json_output;
-        config.on_fail = flags.on_fail;
-        config.cmd = flags.cmd;
-        config.incremental = flags.incremental;
-        config.set_dry_run(if flags.dry_run { DryRun::UserSelected } else { DryRun::Disabled });
-        config.dump_bootstrap_shims = flags.dump_bootstrap_shims;
-        config.keep_stage = flags.keep_stage;
-        config.keep_stage_std = flags.keep_stage_std;
-        config.color = flags.color;
-        config.free_args = std::mem::take(&mut flags.free_args);
-        config.llvm_profile_use = flags.llvm_profile_use;
-        config.llvm_profile_generate = flags.llvm_profile_generate;
-        config.enable_bolt_settings = flags.enable_bolt_settings;
-        config.bypass_bootstrap_lock = flags.bypass_bootstrap_lock;
-        config.is_running_on_ci = flags.ci.unwrap_or(CiEnv::is_ci());
-        config.skip_std_check_if_no_download_rustc = flags.skip_std_check_if_no_download_rustc;
+        config.include_default_paths = flags_include_default_paths;
+        config.rustc_error_format = flags_rustc_error_format;
+        config.json_output = flags_json_output;
+        config.on_fail = flags_on_fail;
+        config.cmd = flags_cmd;
+        config.incremental = flags_incremental;
+        config.set_dry_run(if flags_dry_run { DryRun::UserSelected } else { DryRun::Disabled });
+        config.dump_bootstrap_shims = flags_dump_bootstrap_shims;
+        config.keep_stage = flags_keep_stage;
+        config.keep_stage_std = flags_keep_stage_std;
+        config.color = flags_color;
+        config.free_args = std::mem::take(&mut flags_free_args);
+        config.llvm_profile_use = flags_llvm_profile_use;
+        config.llvm_profile_generate = flags_llvm_profile_generate;
+        config.enable_bolt_settings = flags_enable_bolt_settings;
+        config.bypass_bootstrap_lock = flags_bypass_bootstrap_lock;
+        config.is_running_on_ci = flags_ci.unwrap_or(CiEnv::is_ci());
+        config.skip_std_check_if_no_download_rustc = flags_skip_std_check_if_no_download_rustc;
 
         // Infer the rest of the configuration.
 
-        if let Some(src) = flags.src {
+        if let Some(src) = flags_src {
             config.src = src
         } else {
             // Infer the source directory. This is non-trivial because we want to support a downloaded bootstrap binary,
@@ -510,8 +552,7 @@ impl Config {
         // 4. `<root>/bootstrap.toml`
         // 5. `./config.toml` (fallback for backward compatibility)
         // 6. `<root>/config.toml`
-        let toml_path = flags
-            .config
+        let toml_path = flags_config
             .clone()
             .or_else(|| env::var_os("RUST_BOOTSTRAP_CONFIG").map(PathBuf::from));
         let using_default_path = toml_path.is_none();
@@ -610,7 +651,7 @@ impl Config {
         }
 
         let mut override_toml = TomlConfig::default();
-        for option in flags.set.iter() {
+        for option in flags_set.iter() {
             fn get_table(option: &str) -> Result<TomlConfig, toml::de::Error> {
                 toml::from_str(option).and_then(|table: toml::Value| TomlConfig::deserialize(table))
             }
@@ -708,7 +749,7 @@ impl Config {
             exclude,
         } = toml.build.unwrap_or_default();
 
-        let mut paths: Vec<PathBuf> = flags.skip.into_iter().chain(flags.exclude).collect();
+        let mut paths: Vec<PathBuf> = flags_skip.into_iter().chain(flags_exclude).collect();
 
         if let Some(exclude) = exclude {
             paths.extend(exclude);
@@ -728,13 +769,15 @@ impl Config {
             })
             .collect();
 
-        config.jobs = Some(threads_from_config(flags.jobs.unwrap_or(jobs.unwrap_or(0))));
+        config.jobs = Some(threads_from_config(flags_jobs.unwrap_or(jobs.unwrap_or(0))));
 
-        if let Some(file_build) = build {
+        if let Some(flags_build) = flags_build {
+            config.host_target = TargetSelection::from_user(&flags_build);
+        } else if let Some(file_build) = build {
             config.host_target = TargetSelection::from_user(&file_build);
         };
 
-        set(&mut config.out, flags.build_dir.or_else(|| build_dir.map(PathBuf::from)));
+        set(&mut config.out, flags_build_dir.or_else(|| build_dir.map(PathBuf::from)));
         // NOTE: Bootstrap spawns various commands with different working directories.
         // To avoid writing to random places on the file system, `config.out` needs to be an absolute path.
         if !config.out.is_absolute() {
@@ -749,7 +792,7 @@ impl Config {
         }
 
         config.initial_rustc = if let Some(rustc) = rustc {
-            if !flags.skip_stage0_validation {
+            if !flags_skip_stage0_validation {
                 config.check_stage0_version(&rustc, "rustc");
             }
             rustc
@@ -775,7 +818,7 @@ impl Config {
         config.initial_cargo_clippy = cargo_clippy;
 
         config.initial_cargo = if let Some(cargo) = cargo {
-            if !flags.skip_stage0_validation {
+            if !flags_skip_stage0_validation {
                 config.check_stage0_version(&cargo, "cargo");
             }
             cargo
@@ -791,14 +834,14 @@ impl Config {
             config.out = dir;
         }
 
-        config.hosts = if let Some(TargetSelectionList(arg_host)) = flags.host {
+        config.hosts = if let Some(TargetSelectionList(arg_host)) = flags_host {
             arg_host
         } else if let Some(file_host) = host {
             file_host.iter().map(|h| TargetSelection::from_user(h)).collect()
         } else {
             vec![config.host_target]
         };
-        config.targets = if let Some(TargetSelectionList(arg_target)) = flags.target {
+        config.targets = if let Some(TargetSelectionList(arg_target)) = flags_target {
             arg_target
         } else if let Some(file_target) = target {
             file_target.iter().map(|h| TargetSelection::from_user(h)).collect()
@@ -837,7 +880,7 @@ impl Config {
         set(&mut config.print_step_rusage, print_step_rusage);
         config.patch_binaries_for_nix = patch_binaries_for_nix;
 
-        config.verbose = cmp::max(config.verbose, flags.verbose as usize);
+        config.verbose = cmp::max(config.verbose, flags_verbose as usize);
 
         // Verbose flag is a good default for `rust.verbose-tests`.
         config.verbose_tests = config.is_verbose();
@@ -892,12 +935,12 @@ impl Config {
             config.channel = ci_channel.into();
         }
 
-        config.rust_profile_use = flags.rust_profile_use;
-        config.rust_profile_generate = flags.rust_profile_generate;
+        config.rust_profile_use = flags_rust_profile_use;
+        config.rust_profile_generate = flags_rust_profile_generate;
 
-        config.apply_rust_config(toml.rust, flags.warnings, &mut description);
+        config.apply_rust_config(toml.rust, flags_warnings, &mut description);
 
-        config.reproducible_artifacts = flags.reproducible_artifact;
+        config.reproducible_artifacts = flags_reproducible_artifact;
         config.description = description;
 
         // We need to override `rust.channel` if it's manually specified when using the CI rustc.
@@ -953,7 +996,7 @@ impl Config {
 
         if matches!(config.lld_mode, LldMode::SelfContained)
             && !config.lld_enabled
-            && flags.stage.unwrap_or(0) > 0
+            && flags_stage.unwrap_or(0) > 0
         {
             panic!(
                 "Trying to use self-contained lld as a linker, but LLD is not being added to the sysroot. Enable it with rust.lld = true."
@@ -972,7 +1015,7 @@ impl Config {
         config.compiletest_use_stage0_libtest = compiletest_use_stage0_libtest.unwrap_or(true);
 
         let download_rustc = config.download_rustc_commit.is_some();
-        config.explicit_stage_from_cli = flags.stage.is_some();
+        config.explicit_stage_from_cli = flags_stage.is_some();
         config.explicit_stage_from_config = test_stage.is_some()
             || build_stage.is_some()
             || doc_stage.is_some()
@@ -982,22 +1025,22 @@ impl Config {
             || bench_stage.is_some();
         // See https://github.com/rust-lang/compiler-team/issues/326
         config.stage = match config.cmd {
-            Subcommand::Check { .. } => flags.stage.or(check_stage).unwrap_or(0),
-            Subcommand::Clippy { .. } | Subcommand::Fix => flags.stage.or(check_stage).unwrap_or(1),
+            Subcommand::Check { .. } => flags_stage.or(check_stage).unwrap_or(0),
+            Subcommand::Clippy { .. } | Subcommand::Fix => flags_stage.or(check_stage).unwrap_or(1),
             // `download-rustc` only has a speed-up for stage2 builds. Default to stage2 unless explicitly overridden.
             Subcommand::Doc { .. } => {
-                flags.stage.or(doc_stage).unwrap_or(if download_rustc { 2 } else { 1 })
+                flags_stage.or(doc_stage).unwrap_or(if download_rustc { 2 } else { 1 })
             }
             Subcommand::Build => {
-                flags.stage.or(build_stage).unwrap_or(if download_rustc { 2 } else { 1 })
+                flags_stage.or(build_stage).unwrap_or(if download_rustc { 2 } else { 1 })
             }
             Subcommand::Test { .. } | Subcommand::Miri { .. } => {
-                flags.stage.or(test_stage).unwrap_or(if download_rustc { 2 } else { 1 })
+                flags_stage.or(test_stage).unwrap_or(if download_rustc { 2 } else { 1 })
             }
-            Subcommand::Bench { .. } => flags.stage.or(bench_stage).unwrap_or(2),
-            Subcommand::Dist => flags.stage.or(dist_stage).unwrap_or(2),
-            Subcommand::Install => flags.stage.or(install_stage).unwrap_or(2),
-            Subcommand::Perf { .. } => flags.stage.unwrap_or(1),
+            Subcommand::Bench { .. } => flags_stage.or(bench_stage).unwrap_or(2),
+            Subcommand::Dist => flags_stage.or(dist_stage).unwrap_or(2),
+            Subcommand::Install => flags_stage.or(install_stage).unwrap_or(2),
+            Subcommand::Perf { .. } => flags_stage.unwrap_or(1),
             // These are all bootstrap tools, which don't depend on the compiler.
             // The stage we pass shouldn't matter, but use 0 just in case.
             Subcommand::Clean { .. }
@@ -1005,12 +1048,12 @@ impl Config {
             | Subcommand::Setup { .. }
             | Subcommand::Format { .. }
             | Subcommand::Suggest { .. }
-            | Subcommand::Vendor { .. } => flags.stage.unwrap_or(0),
+            | Subcommand::Vendor { .. } => flags_stage.unwrap_or(0),
         };
 
         // CI should always run stage 2 builds, unless it specifically states otherwise
         #[cfg(not(test))]
-        if flags.stage.is_none() && config.is_running_on_ci {
+        if flags_stage.is_none() && config.is_running_on_ci {
             match config.cmd {
                 Subcommand::Test { .. }
                 | Subcommand::Miri { .. }
diff --git a/src/bootstrap/src/core/config/flags.rs b/src/bootstrap/src/core/config/flags.rs
index ea0251e209af0..bb21d033458f4 100644
--- a/src/bootstrap/src/core/config/flags.rs
+++ b/src/bootstrap/src/core/config/flags.rs
@@ -80,6 +80,7 @@ pub struct Flags {
     /// include default paths in addition to the provided ones
     pub include_default_paths: bool,
 
+    /// rustc error format
     #[arg(global = true, value_hint = clap::ValueHint::Other, long)]
     pub rustc_error_format: Option<String>,
 
@@ -127,9 +128,6 @@ pub struct Flags {
     /// otherwise, use the default configured behaviour
     pub warnings: Warnings,
 
-    #[arg(global = true, value_hint = clap::ValueHint::Other, long, value_name = "FORMAT")]
-    /// rustc error format
-    pub error_format: Option<String>,
     #[arg(global = true, long)]
     /// use message-format=json
     pub json_output: bool,
diff --git a/src/bootstrap/src/utils/cache.rs b/src/bootstrap/src/utils/cache.rs
index 0c7374709584c..5098e2f03c439 100644
--- a/src/bootstrap/src/utils/cache.rs
+++ b/src/bootstrap/src/utils/cache.rs
@@ -218,10 +218,15 @@ pub struct Cache {
         >,
     >,
     #[cfg(test)]
-    /// Contains steps in the same order in which they were executed
-    /// Useful for tests
-    /// Tuples (step, step output)
-    executed_steps: RefCell<Vec<(Box<dyn Any>, Box<dyn Any>)>>,
+    /// Contains step metadata of executed steps (in the same order in which they were executed).
+    /// Useful for tests.
+    executed_steps: RefCell<Vec<ExecutedStep>>,
+}
+
+#[cfg(test)]
+#[derive(Debug)]
+pub struct ExecutedStep {
+    pub metadata: Option<crate::core::builder::StepMetadata>,
 }
 
 impl Cache {
@@ -243,9 +248,8 @@ impl Cache {
 
         #[cfg(test)]
         {
-            let step: Box<dyn Any> = Box::new(step.clone());
-            let output: Box<dyn Any> = Box::new(value.clone());
-            self.executed_steps.borrow_mut().push((step, output));
+            let metadata = step.metadata();
+            self.executed_steps.borrow_mut().push(ExecutedStep { metadata });
         }
 
         stepcache.insert(step, value);
@@ -283,7 +287,7 @@ impl Cache {
     }
 
     #[cfg(test)]
-    pub fn into_executed_steps(mut self) -> Vec<(Box<dyn Any>, Box<dyn Any>)> {
+    pub fn into_executed_steps(mut self) -> Vec<ExecutedStep> {
         mem::take(&mut self.executed_steps.borrow_mut())
     }
 }
diff --git a/src/bootstrap/src/utils/channel.rs b/src/bootstrap/src/utils/channel.rs
index 38f250af42f08..b28ab57377408 100644
--- a/src/bootstrap/src/utils/channel.rs
+++ b/src/bootstrap/src/utils/channel.rs
@@ -11,7 +11,7 @@ use std::path::Path;
 use super::execution_context::ExecutionContext;
 use super::helpers;
 use crate::Build;
-use crate::utils::helpers::{start_process, t};
+use crate::utils::helpers::t;
 
 #[derive(Clone, Default)]
 pub enum GitInfo {
@@ -46,7 +46,7 @@ impl GitInfo {
 
         let mut git_command = helpers::git(Some(dir));
         git_command.arg("rev-parse");
-        let output = git_command.allow_failure().run_capture(exec_ctx);
+        let output = git_command.allow_failure().run_capture(&exec_ctx);
 
         if output.is_failure() {
             return GitInfo::Absent;
@@ -59,23 +59,32 @@ impl GitInfo {
         }
 
         // Ok, let's scrape some info
-        let ver_date = start_process(
-            helpers::git(Some(dir))
-                .arg("log")
-                .arg("-1")
-                .arg("--date=short")
-                .arg("--pretty=format:%cd")
-                .as_command_mut(),
-        );
+        // We use the command's spawn API to execute these commands concurrently, which leads to performance improvements.
+        let mut git_log_cmd = helpers::git(Some(dir));
+        let ver_date = git_log_cmd
+            .arg("log")
+            .arg("-1")
+            .arg("--date=short")
+            .arg("--pretty=format:%cd")
+            .run_always()
+            .start_capture_stdout(&exec_ctx);
+
+        let mut git_hash_cmd = helpers::git(Some(dir));
         let ver_hash =
-            start_process(helpers::git(Some(dir)).arg("rev-parse").arg("HEAD").as_command_mut());
-        let short_ver_hash = start_process(
-            helpers::git(Some(dir)).arg("rev-parse").arg("--short=9").arg("HEAD").as_command_mut(),
-        );
+            git_hash_cmd.arg("rev-parse").arg("HEAD").run_always().start_capture_stdout(&exec_ctx);
+
+        let mut git_short_hash_cmd = helpers::git(Some(dir));
+        let short_ver_hash = git_short_hash_cmd
+            .arg("rev-parse")
+            .arg("--short=9")
+            .arg("HEAD")
+            .run_always()
+            .start_capture_stdout(&exec_ctx);
+
         GitInfo::Present(Some(Info {
-            commit_date: ver_date().trim().to_string(),
-            sha: ver_hash().trim().to_string(),
-            short_sha: short_ver_hash().trim().to_string(),
+            commit_date: ver_date.wait_for_output(&exec_ctx).stdout().trim().to_string(),
+            sha: ver_hash.wait_for_output(&exec_ctx).stdout().trim().to_string(),
+            short_sha: short_ver_hash.wait_for_output(&exec_ctx).stdout().trim().to_string(),
         }))
     }
 
diff --git a/src/bootstrap/src/utils/exec.rs b/src/bootstrap/src/utils/exec.rs
index f297300e34a85..eb9802bf2e1ba 100644
--- a/src/bootstrap/src/utils/exec.rs
+++ b/src/bootstrap/src/utils/exec.rs
@@ -2,7 +2,6 @@
 //!
 //! This module provides a structured way to execute and manage commands efficiently,
 //! ensuring controlled failure handling and output management.
-
 use std::ffi::OsStr;
 use std::fmt::{Debug, Formatter};
 use std::path::Path;
@@ -11,7 +10,7 @@ use std::process::{Command, CommandArgs, CommandEnvs, ExitStatus, Output, Stdio}
 use build_helper::ci::CiEnv;
 use build_helper::drop_bomb::DropBomb;
 
-use super::execution_context::ExecutionContext;
+use super::execution_context::{DeferredCommand, ExecutionContext};
 
 /// What should be done when the command fails.
 #[derive(Debug, Copy, Clone)]
@@ -73,7 +72,7 @@ pub struct BootstrapCommand {
     drop_bomb: DropBomb,
 }
 
-impl BootstrapCommand {
+impl<'a> BootstrapCommand {
     #[track_caller]
     pub fn new<S: AsRef<OsStr>>(program: S) -> Self {
         Command::new(program).into()
@@ -158,6 +157,24 @@ impl BootstrapCommand {
         exec_ctx.as_ref().run(self, OutputMode::Capture, OutputMode::Print)
     }
 
+    /// Spawn the command in background, while capturing and returning all its output.
+    #[track_caller]
+    pub fn start_capture(
+        &'a mut self,
+        exec_ctx: impl AsRef<ExecutionContext>,
+    ) -> DeferredCommand<'a> {
+        exec_ctx.as_ref().start(self, OutputMode::Capture, OutputMode::Capture)
+    }
+
+    /// Spawn the command in background, while capturing and returning stdout, and printing stderr.
+    #[track_caller]
+    pub fn start_capture_stdout(
+        &'a mut self,
+        exec_ctx: impl AsRef<ExecutionContext>,
+    ) -> DeferredCommand<'a> {
+        exec_ctx.as_ref().start(self, OutputMode::Capture, OutputMode::Print)
+    }
+
     /// Provides access to the stdlib Command inside.
     /// FIXME: This function should be eventually removed from bootstrap.
     pub fn as_command_mut(&mut self) -> &mut Command {
diff --git a/src/bootstrap/src/utils/execution_context.rs b/src/bootstrap/src/utils/execution_context.rs
index a5e1e9bcc07df..5b9fef3f8248b 100644
--- a/src/bootstrap/src/utils/execution_context.rs
+++ b/src/bootstrap/src/utils/execution_context.rs
@@ -3,6 +3,8 @@
 //! This module provides the [`ExecutionContext`] type, which holds global configuration
 //! relevant during the execution of commands in bootstrap. This includes dry-run
 //! mode, verbosity level, and behavior on failure.
+use std::panic::Location;
+use std::process::Child;
 use std::sync::{Arc, Mutex};
 
 use crate::core::config::DryRun;
@@ -80,23 +82,24 @@ impl ExecutionContext {
     /// Note: Ideally, you should use one of the BootstrapCommand::run* functions to
     /// execute commands. They internally call this method.
     #[track_caller]
-    pub fn run(
+    pub fn start<'a>(
         &self,
-        command: &mut BootstrapCommand,
+        command: &'a mut BootstrapCommand,
         stdout: OutputMode,
         stderr: OutputMode,
-    ) -> CommandOutput {
+    ) -> DeferredCommand<'a> {
         command.mark_as_executed();
+
+        let created_at = command.get_created_location();
+        let executed_at = std::panic::Location::caller();
+
         if self.dry_run() && !command.run_always {
-            return CommandOutput::default();
+            return DeferredCommand { process: None, stdout, stderr, command, executed_at };
         }
 
         #[cfg(feature = "tracing")]
         let _run_span = trace_cmd!(command);
 
-        let created_at = command.get_created_location();
-        let executed_at = std::panic::Location::caller();
-
         self.verbose(|| {
             println!("running: {command:?} (created at {created_at}, executed at {executed_at})")
         });
@@ -105,92 +108,149 @@ impl ExecutionContext {
         cmd.stdout(stdout.stdio());
         cmd.stderr(stderr.stdio());
 
-        let output = cmd.output();
+        let child = cmd.spawn();
 
-        use std::fmt::Write;
+        DeferredCommand { process: Some(child), stdout, stderr, command, executed_at }
+    }
 
-        let mut message = String::new();
-        let output: CommandOutput = match output {
-            // Command has succeeded
-            Ok(output) if output.status.success() => {
-                CommandOutput::from_output(output, stdout, stderr)
+    /// Execute a command and return its output.
+    /// Note: Ideally, you should use one of the BootstrapCommand::run* functions to
+    /// execute commands. They internally call this method.
+    #[track_caller]
+    pub fn run(
+        &self,
+        command: &mut BootstrapCommand,
+        stdout: OutputMode,
+        stderr: OutputMode,
+    ) -> CommandOutput {
+        self.start(command, stdout, stderr).wait_for_output(self)
+    }
+
+    fn fail(&self, message: &str, output: CommandOutput) -> ! {
+        if self.is_verbose() {
+            println!("{message}");
+        } else {
+            let (stdout, stderr) = (output.stdout_if_present(), output.stderr_if_present());
+            // If the command captures output, the user would not see any indication that
+            // it has failed. In this case, print a more verbose error, since to provide more
+            // context.
+            if stdout.is_some() || stderr.is_some() {
+                if let Some(stdout) = output.stdout_if_present().take_if(|s| !s.trim().is_empty()) {
+                    println!("STDOUT:\n{stdout}\n");
+                }
+                if let Some(stderr) = output.stderr_if_present().take_if(|s| !s.trim().is_empty()) {
+                    println!("STDERR:\n{stderr}\n");
+                }
+                println!("Command has failed. Rerun with -v to see more details.");
+            } else {
+                println!("Command has failed. Rerun with -v to see more details.");
             }
-            // Command has started, but then it failed
-            Ok(output) => {
-                writeln!(
-                    message,
-                    r#"
-Command {command:?} did not execute successfully.
+        }
+        exit!(1);
+    }
+}
+
+impl AsRef<ExecutionContext> for ExecutionContext {
+    fn as_ref(&self) -> &ExecutionContext {
+        self
+    }
+}
+
+pub struct DeferredCommand<'a> {
+    process: Option<Result<Child, std::io::Error>>,
+    command: &'a mut BootstrapCommand,
+    stdout: OutputMode,
+    stderr: OutputMode,
+    executed_at: &'a Location<'a>,
+}
+
+impl<'a> DeferredCommand<'a> {
+    pub fn wait_for_output(mut self, exec_ctx: impl AsRef<ExecutionContext>) -> CommandOutput {
+        let exec_ctx = exec_ctx.as_ref();
+
+        let process = match self.process.take() {
+            Some(p) => p,
+            None => return CommandOutput::default(),
+        };
+
+        let created_at = self.command.get_created_location();
+        let executed_at = self.executed_at;
+
+        let mut message = String::new();
+
+        let output = match process {
+            Ok(child) => match child.wait_with_output() {
+                Ok(result) if result.status.success() => {
+                    // Successful execution
+                    CommandOutput::from_output(result, self.stdout, self.stderr)
+                }
+                Ok(result) => {
+                    // Command ran but failed
+                    use std::fmt::Write;
+
+                    writeln!(
+                        message,
+                        r#"
+Command {:?} did not execute successfully.
 Expected success, got {}
 Created at: {created_at}
 Executed at: {executed_at}"#,
-                    output.status,
-                )
-                .unwrap();
+                        self.command, result.status,
+                    )
+                    .unwrap();
+
+                    let output = CommandOutput::from_output(result, self.stdout, self.stderr);
 
-                let output: CommandOutput = CommandOutput::from_output(output, stdout, stderr);
+                    if self.stdout.captures() {
+                        writeln!(message, "\nSTDOUT ----\n{}", output.stdout().trim()).unwrap();
+                    }
+                    if self.stderr.captures() {
+                        writeln!(message, "\nSTDERR ----\n{}", output.stderr().trim()).unwrap();
+                    }
 
-                // If the output mode is OutputMode::Capture, we can now print the output.
-                // If it is OutputMode::Print, then the output has already been printed to
-                // stdout/stderr, and we thus don't have anything captured to print anyway.
-                if stdout.captures() {
-                    writeln!(message, "\nSTDOUT ----\n{}", output.stdout().trim()).unwrap();
+                    output
                 }
-                if stderr.captures() {
-                    writeln!(message, "\nSTDERR ----\n{}", output.stderr().trim()).unwrap();
+                Err(e) => {
+                    // Failed to wait for output
+                    use std::fmt::Write;
+
+                    writeln!(
+                        message,
+                        "\n\nCommand {:?} did not execute successfully.\
+                        \nIt was not possible to execute the command: {e:?}",
+                        self.command
+                    )
+                    .unwrap();
+
+                    CommandOutput::did_not_start(self.stdout, self.stderr)
                 }
-                output
-            }
-            // The command did not even start
+            },
             Err(e) => {
+                // Failed to spawn the command
+                use std::fmt::Write;
+
                 writeln!(
                     message,
-                    "\n\nCommand {command:?} did not execute successfully.\
-            \nIt was not possible to execute the command: {e:?}"
+                    "\n\nCommand {:?} did not execute successfully.\
+                    \nIt was not possible to execute the command: {e:?}",
+                    self.command
                 )
                 .unwrap();
-                CommandOutput::did_not_start(stdout, stderr)
-            }
-        };
 
-        let fail = |message: &str, output: CommandOutput| -> ! {
-            if self.is_verbose() {
-                println!("{message}");
-            } else {
-                let (stdout, stderr) = (output.stdout_if_present(), output.stderr_if_present());
-                // If the command captures output, the user would not see any indication that
-                // it has failed. In this case, print a more verbose error, since to provide more
-                // context.
-                if stdout.is_some() || stderr.is_some() {
-                    if let Some(stdout) =
-                        output.stdout_if_present().take_if(|s| !s.trim().is_empty())
-                    {
-                        println!("STDOUT:\n{stdout}\n");
-                    }
-                    if let Some(stderr) =
-                        output.stderr_if_present().take_if(|s| !s.trim().is_empty())
-                    {
-                        println!("STDERR:\n{stderr}\n");
-                    }
-                    println!("Command {command:?} has failed. Rerun with -v to see more details.");
-                } else {
-                    println!("Command has failed. Rerun with -v to see more details.");
-                }
+                CommandOutput::did_not_start(self.stdout, self.stderr)
             }
-            exit!(1);
         };
 
         if !output.is_success() {
-            match command.failure_behavior {
+            match self.command.failure_behavior {
                 BehaviorOnFailure::DelayFail => {
-                    if self.fail_fast {
-                        fail(&message, output);
+                    if exec_ctx.fail_fast {
+                        exec_ctx.fail(&message, output);
                     }
-
-                    self.add_to_delay_failure(message);
+                    exec_ctx.add_to_delay_failure(message);
                 }
                 BehaviorOnFailure::Exit => {
-                    fail(&message, output);
+                    exec_ctx.fail(&message, output);
                 }
                 BehaviorOnFailure::Ignore => {
                     // If failures are allowed, either the error has been printed already
@@ -199,6 +259,7 @@ Executed at: {executed_at}"#,
                 }
             }
         }
+
         output
     }
 }
diff --git a/src/bootstrap/src/utils/helpers.rs b/src/bootstrap/src/utils/helpers.rs
index f4be22f1e649e..2f18fb6031829 100644
--- a/src/bootstrap/src/utils/helpers.rs
+++ b/src/bootstrap/src/utils/helpers.rs
@@ -5,13 +5,11 @@
 
 use std::ffi::OsStr;
 use std::path::{Path, PathBuf};
-use std::process::{Command, Stdio};
 use std::sync::OnceLock;
 use std::thread::panicking;
 use std::time::{Instant, SystemTime, UNIX_EPOCH};
 use std::{env, fs, io, panic, str};
 
-use build_helper::util::fail;
 use object::read::archive::ArchiveFile;
 
 use crate::LldMode;
@@ -282,33 +280,6 @@ pub fn make(host: &str) -> PathBuf {
     }
 }
 
-/// Spawn a process and return a closure that will wait for the process
-/// to finish and then return its output. This allows the spawned process
-/// to do work without immediately blocking bootstrap.
-#[track_caller]
-pub fn start_process(cmd: &mut Command) -> impl FnOnce() -> String + use<> {
-    let child = match cmd.stderr(Stdio::inherit()).stdout(Stdio::piped()).spawn() {
-        Ok(child) => child,
-        Err(e) => fail(&format!("failed to execute command: {cmd:?}\nERROR: {e}")),
-    };
-
-    let command = format!("{cmd:?}");
-
-    move || {
-        let output = child.wait_with_output().unwrap();
-
-        if !output.status.success() {
-            panic!(
-                "command did not execute successfully: {}\n\
-                 expected success, got: {}",
-                command, output.status
-            );
-        }
-
-        String::from_utf8(output.stdout).unwrap()
-    }
-}
-
 /// Returns the last-modified time for `path`, or zero if it doesn't exist.
 pub fn mtime(path: &Path) -> SystemTime {
     fs::metadata(path).and_then(|f| f.modified()).unwrap_or(UNIX_EPOCH)
diff --git a/src/doc/rustc/src/command-line-arguments.md b/src/doc/rustc/src/command-line-arguments.md
index b704cee705b05..d45ad1be27b8c 100644
--- a/src/doc/rustc/src/command-line-arguments.md
+++ b/src/doc/rustc/src/command-line-arguments.md
@@ -471,6 +471,9 @@ to customize the output:
 - `future-incompat` - includes a JSON message that contains a report if the
   crate contains any code that may fail to compile in the future.
 
+- `timings` - output a JSON message when a certain compilation "section"
+  (such as frontend analysis, code generation, linking) begins or ends.
+
 Note that it is invalid to combine the `--json` argument with the
 [`--color`](#option-color) argument, and it is required to combine `--json`
 with `--error-format=json`.
diff --git a/src/doc/rustc/src/json.md b/src/doc/rustc/src/json.md
index c853f34ee036c..7421dd6210806 100644
--- a/src/doc/rustc/src/json.md
+++ b/src/doc/rustc/src/json.md
@@ -298,6 +298,35 @@ appropriately. (This is needed by Cargo which shares the same dependencies
 across multiple build targets, so it should only report an unused dependency if
 its not used by any of the targets.)
 
+## Timings
+
+**This setting is currently unstable and requires usage of `-Zunstable-options`.**
+
+The `--timings` option will tell `rustc` to emit messages when a certain compilation
+section (such as code generation or linking) begins or ends. The messages currently have
+the following format:
+
+```json
+{
+    "$message_type": "section_timing", /* Type of this message */
+    "event": "start", /* Marks the "start" or "end" of the compilation section */
+    "name": "link",  /* The name of the compilation section */
+    // Opaque timestamp when the message was emitted, in microseconds
+    // The timestamp is currently relative to the beginning of the compilation session
+    "time": 12345
+}
+```
+
+Note that the JSON format of the `timings` messages is unstable and subject to change.
+
+Compilation sections can be nested; for example, if you encounter the start of "foo",
+then the start of "bar", then the end of "bar" and then the end of "bar", it means that the
+"bar" section happened as a part of the "foo" section.
+
+The timestamp should only be used for computing the duration of each section.
+
+We currently do not guarantee any specific section names to be emitted.
+
 [option-emit]: command-line-arguments.md#option-emit
 [option-error-format]: command-line-arguments.md#option-error-format
 [option-json]: command-line-arguments.md#option-json
diff --git a/src/doc/unstable-book/src/compiler-flags/hint-mostly-unused.md b/src/doc/unstable-book/src/compiler-flags/hint-mostly-unused.md
new file mode 100644
index 0000000000000..80f5b1c44500d
--- /dev/null
+++ b/src/doc/unstable-book/src/compiler-flags/hint-mostly-unused.md
@@ -0,0 +1,33 @@
+# `hint-mostly-unused`
+
+This flag hints to the compiler that most of the crate will probably go unused.
+The compiler can optimize its operation based on this assumption, in order to
+compile faster. This is a hint, and does not guarantee any particular behavior.
+
+This option can substantially speed up compilation if applied to a large
+dependency where the majority of the dependency does not get used. This flag
+may slow down compilation in other cases.
+
+Currently, this option makes the compiler defer as much code generation as
+possible from functions in the crate, until later crates invoke those
+functions. Functions that never get invoked will never have code generated for
+them. For instance, if a crate provides thousands of functions, but only a few
+of them will get called, this flag will result in the compiler only doing code
+generation for the called functions. (This uses the same mechanisms as
+cross-crate inlining of functions.) This does not affect `extern` functions, or
+functions marked as `#[inline(never)]`.
+
+To try applying this flag to one dependency out of a dependency tree, use the
+[`profile-rustflags`](https://doc.rust-lang.org/cargo/reference/unstable.html#profile-rustflags-option)
+feature of nightly cargo:
+
+```toml
+cargo-features = ["profile-rustflags"]
+
+# ...
+[dependencies]
+mostly-unused-dependency = "1.2.3"
+
+[profile.release.package.mostly-unused-dependency]
+rustflags = ["-Zhint-mostly-unused"]
+```
diff --git a/src/etc/completions/x.fish b/src/etc/completions/x.fish
index a030f45830ea2..46d18ac7dbcbc 100644
--- a/src/etc/completions/x.fish
+++ b/src/etc/completions/x.fish
@@ -1,6 +1,6 @@
 # Print an optspec for argparse to handle cmd's options that are independent of any subcommand.
 function __fish_x_global_optspecs
-	string join \n v/verbose i/incremental config= build-dir= build= host= target= exclude= skip= include-default-paths rustc-error-format= on-fail= dry-run dump-bootstrap-shims stage= keep-stage= keep-stage-std= src= j/jobs= warnings= error-format= json-output color= bypass-bootstrap-lock rust-profile-generate= rust-profile-use= llvm-profile-use= llvm-profile-generate enable-bolt-settings skip-stage0-validation reproducible-artifact= set= ci= skip-std-check-if-no-download-rustc h/help
+	string join \n v/verbose i/incremental config= build-dir= build= host= target= exclude= skip= include-default-paths rustc-error-format= on-fail= dry-run dump-bootstrap-shims stage= keep-stage= keep-stage-std= src= j/jobs= warnings= json-output color= bypass-bootstrap-lock rust-profile-generate= rust-profile-use= llvm-profile-use= llvm-profile-generate enable-bolt-settings skip-stage0-validation reproducible-artifact= set= ci= skip-std-check-if-no-download-rustc h/help
 end
 
 function __fish_x_needs_command
@@ -31,7 +31,7 @@ complete -c x -n "__fish_x_needs_command" -l host -d 'host targets to build' -r
 complete -c x -n "__fish_x_needs_command" -l target -d 'target targets to build' -r -f
 complete -c x -n "__fish_x_needs_command" -l exclude -d 'build paths to exclude' -r -F
 complete -c x -n "__fish_x_needs_command" -l skip -d 'build paths to skip' -r -F
-complete -c x -n "__fish_x_needs_command" -l rustc-error-format -r -f
+complete -c x -n "__fish_x_needs_command" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_needs_command" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x -n "__fish_x_needs_command" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x -n "__fish_x_needs_command" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -39,7 +39,6 @@ complete -c x -n "__fish_x_needs_command" -l keep-stage-std -d 'stage(s) of the
 complete -c x -n "__fish_x_needs_command" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x -n "__fish_x_needs_command" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x -n "__fish_x_needs_command" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x -n "__fish_x_needs_command" -l error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_needs_command" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x -n "__fish_x_needs_command" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x -n "__fish_x_needs_command" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -83,7 +82,7 @@ complete -c x -n "__fish_x_using_subcommand build" -l host -d 'host targets to b
 complete -c x -n "__fish_x_using_subcommand build" -l target -d 'target targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand build" -l exclude -d 'build paths to exclude' -r -F
 complete -c x -n "__fish_x_using_subcommand build" -l skip -d 'build paths to skip' -r -F
-complete -c x -n "__fish_x_using_subcommand build" -l rustc-error-format -r -f
+complete -c x -n "__fish_x_using_subcommand build" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand build" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x -n "__fish_x_using_subcommand build" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x -n "__fish_x_using_subcommand build" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -91,7 +90,6 @@ complete -c x -n "__fish_x_using_subcommand build" -l keep-stage-std -d 'stage(s
 complete -c x -n "__fish_x_using_subcommand build" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x -n "__fish_x_using_subcommand build" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x -n "__fish_x_using_subcommand build" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x -n "__fish_x_using_subcommand build" -l error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand build" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x -n "__fish_x_using_subcommand build" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x -n "__fish_x_using_subcommand build" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -118,7 +116,7 @@ complete -c x -n "__fish_x_using_subcommand check" -l host -d 'host targets to b
 complete -c x -n "__fish_x_using_subcommand check" -l target -d 'target targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand check" -l exclude -d 'build paths to exclude' -r -F
 complete -c x -n "__fish_x_using_subcommand check" -l skip -d 'build paths to skip' -r -F
-complete -c x -n "__fish_x_using_subcommand check" -l rustc-error-format -r -f
+complete -c x -n "__fish_x_using_subcommand check" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand check" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x -n "__fish_x_using_subcommand check" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x -n "__fish_x_using_subcommand check" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -126,7 +124,6 @@ complete -c x -n "__fish_x_using_subcommand check" -l keep-stage-std -d 'stage(s
 complete -c x -n "__fish_x_using_subcommand check" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x -n "__fish_x_using_subcommand check" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x -n "__fish_x_using_subcommand check" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x -n "__fish_x_using_subcommand check" -l error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand check" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x -n "__fish_x_using_subcommand check" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x -n "__fish_x_using_subcommand check" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -158,7 +155,7 @@ complete -c x -n "__fish_x_using_subcommand clippy" -l host -d 'host targets to
 complete -c x -n "__fish_x_using_subcommand clippy" -l target -d 'target targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand clippy" -l exclude -d 'build paths to exclude' -r -F
 complete -c x -n "__fish_x_using_subcommand clippy" -l skip -d 'build paths to skip' -r -F
-complete -c x -n "__fish_x_using_subcommand clippy" -l rustc-error-format -r -f
+complete -c x -n "__fish_x_using_subcommand clippy" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand clippy" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x -n "__fish_x_using_subcommand clippy" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x -n "__fish_x_using_subcommand clippy" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -166,7 +163,6 @@ complete -c x -n "__fish_x_using_subcommand clippy" -l keep-stage-std -d 'stage(
 complete -c x -n "__fish_x_using_subcommand clippy" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x -n "__fish_x_using_subcommand clippy" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x -n "__fish_x_using_subcommand clippy" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x -n "__fish_x_using_subcommand clippy" -l error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand clippy" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x -n "__fish_x_using_subcommand clippy" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x -n "__fish_x_using_subcommand clippy" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -196,7 +192,7 @@ complete -c x -n "__fish_x_using_subcommand fix" -l host -d 'host targets to bui
 complete -c x -n "__fish_x_using_subcommand fix" -l target -d 'target targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand fix" -l exclude -d 'build paths to exclude' -r -F
 complete -c x -n "__fish_x_using_subcommand fix" -l skip -d 'build paths to skip' -r -F
-complete -c x -n "__fish_x_using_subcommand fix" -l rustc-error-format -r -f
+complete -c x -n "__fish_x_using_subcommand fix" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand fix" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x -n "__fish_x_using_subcommand fix" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x -n "__fish_x_using_subcommand fix" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -204,7 +200,6 @@ complete -c x -n "__fish_x_using_subcommand fix" -l keep-stage-std -d 'stage(s)
 complete -c x -n "__fish_x_using_subcommand fix" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x -n "__fish_x_using_subcommand fix" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x -n "__fish_x_using_subcommand fix" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x -n "__fish_x_using_subcommand fix" -l error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand fix" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x -n "__fish_x_using_subcommand fix" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x -n "__fish_x_using_subcommand fix" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -231,7 +226,7 @@ complete -c x -n "__fish_x_using_subcommand fmt" -l host -d 'host targets to bui
 complete -c x -n "__fish_x_using_subcommand fmt" -l target -d 'target targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand fmt" -l exclude -d 'build paths to exclude' -r -F
 complete -c x -n "__fish_x_using_subcommand fmt" -l skip -d 'build paths to skip' -r -F
-complete -c x -n "__fish_x_using_subcommand fmt" -l rustc-error-format -r -f
+complete -c x -n "__fish_x_using_subcommand fmt" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand fmt" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x -n "__fish_x_using_subcommand fmt" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x -n "__fish_x_using_subcommand fmt" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -239,7 +234,6 @@ complete -c x -n "__fish_x_using_subcommand fmt" -l keep-stage-std -d 'stage(s)
 complete -c x -n "__fish_x_using_subcommand fmt" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x -n "__fish_x_using_subcommand fmt" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x -n "__fish_x_using_subcommand fmt" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x -n "__fish_x_using_subcommand fmt" -l error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand fmt" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x -n "__fish_x_using_subcommand fmt" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x -n "__fish_x_using_subcommand fmt" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -268,7 +262,7 @@ complete -c x -n "__fish_x_using_subcommand doc" -l host -d 'host targets to bui
 complete -c x -n "__fish_x_using_subcommand doc" -l target -d 'target targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand doc" -l exclude -d 'build paths to exclude' -r -F
 complete -c x -n "__fish_x_using_subcommand doc" -l skip -d 'build paths to skip' -r -F
-complete -c x -n "__fish_x_using_subcommand doc" -l rustc-error-format -r -f
+complete -c x -n "__fish_x_using_subcommand doc" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand doc" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x -n "__fish_x_using_subcommand doc" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x -n "__fish_x_using_subcommand doc" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -276,7 +270,6 @@ complete -c x -n "__fish_x_using_subcommand doc" -l keep-stage-std -d 'stage(s)
 complete -c x -n "__fish_x_using_subcommand doc" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x -n "__fish_x_using_subcommand doc" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x -n "__fish_x_using_subcommand doc" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x -n "__fish_x_using_subcommand doc" -l error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand doc" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x -n "__fish_x_using_subcommand doc" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x -n "__fish_x_using_subcommand doc" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -311,7 +304,7 @@ complete -c x -n "__fish_x_using_subcommand test" -l host -d 'host targets to bu
 complete -c x -n "__fish_x_using_subcommand test" -l target -d 'target targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand test" -l exclude -d 'build paths to exclude' -r -F
 complete -c x -n "__fish_x_using_subcommand test" -l skip -d 'build paths to skip' -r -F
-complete -c x -n "__fish_x_using_subcommand test" -l rustc-error-format -r -f
+complete -c x -n "__fish_x_using_subcommand test" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand test" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x -n "__fish_x_using_subcommand test" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x -n "__fish_x_using_subcommand test" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -319,7 +312,6 @@ complete -c x -n "__fish_x_using_subcommand test" -l keep-stage-std -d 'stage(s)
 complete -c x -n "__fish_x_using_subcommand test" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x -n "__fish_x_using_subcommand test" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x -n "__fish_x_using_subcommand test" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x -n "__fish_x_using_subcommand test" -l error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand test" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x -n "__fish_x_using_subcommand test" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x -n "__fish_x_using_subcommand test" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -355,7 +347,7 @@ complete -c x -n "__fish_x_using_subcommand miri" -l host -d 'host targets to bu
 complete -c x -n "__fish_x_using_subcommand miri" -l target -d 'target targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand miri" -l exclude -d 'build paths to exclude' -r -F
 complete -c x -n "__fish_x_using_subcommand miri" -l skip -d 'build paths to skip' -r -F
-complete -c x -n "__fish_x_using_subcommand miri" -l rustc-error-format -r -f
+complete -c x -n "__fish_x_using_subcommand miri" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand miri" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x -n "__fish_x_using_subcommand miri" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x -n "__fish_x_using_subcommand miri" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -363,7 +355,6 @@ complete -c x -n "__fish_x_using_subcommand miri" -l keep-stage-std -d 'stage(s)
 complete -c x -n "__fish_x_using_subcommand miri" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x -n "__fish_x_using_subcommand miri" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x -n "__fish_x_using_subcommand miri" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x -n "__fish_x_using_subcommand miri" -l error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand miri" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x -n "__fish_x_using_subcommand miri" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x -n "__fish_x_using_subcommand miri" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -394,7 +385,7 @@ complete -c x -n "__fish_x_using_subcommand bench" -l host -d 'host targets to b
 complete -c x -n "__fish_x_using_subcommand bench" -l target -d 'target targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand bench" -l exclude -d 'build paths to exclude' -r -F
 complete -c x -n "__fish_x_using_subcommand bench" -l skip -d 'build paths to skip' -r -F
-complete -c x -n "__fish_x_using_subcommand bench" -l rustc-error-format -r -f
+complete -c x -n "__fish_x_using_subcommand bench" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand bench" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x -n "__fish_x_using_subcommand bench" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x -n "__fish_x_using_subcommand bench" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -402,7 +393,6 @@ complete -c x -n "__fish_x_using_subcommand bench" -l keep-stage-std -d 'stage(s
 complete -c x -n "__fish_x_using_subcommand bench" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x -n "__fish_x_using_subcommand bench" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x -n "__fish_x_using_subcommand bench" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x -n "__fish_x_using_subcommand bench" -l error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand bench" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x -n "__fish_x_using_subcommand bench" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x -n "__fish_x_using_subcommand bench" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -430,14 +420,13 @@ complete -c x -n "__fish_x_using_subcommand clean" -l host -d 'host targets to b
 complete -c x -n "__fish_x_using_subcommand clean" -l target -d 'target targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand clean" -l exclude -d 'build paths to exclude' -r -F
 complete -c x -n "__fish_x_using_subcommand clean" -l skip -d 'build paths to skip' -r -F
-complete -c x -n "__fish_x_using_subcommand clean" -l rustc-error-format -r -f
+complete -c x -n "__fish_x_using_subcommand clean" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand clean" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x -n "__fish_x_using_subcommand clean" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
 complete -c x -n "__fish_x_using_subcommand clean" -l keep-stage-std -d 'stage(s) of the standard library to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
 complete -c x -n "__fish_x_using_subcommand clean" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x -n "__fish_x_using_subcommand clean" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x -n "__fish_x_using_subcommand clean" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x -n "__fish_x_using_subcommand clean" -l error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand clean" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x -n "__fish_x_using_subcommand clean" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x -n "__fish_x_using_subcommand clean" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -465,7 +454,7 @@ complete -c x -n "__fish_x_using_subcommand dist" -l host -d 'host targets to bu
 complete -c x -n "__fish_x_using_subcommand dist" -l target -d 'target targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand dist" -l exclude -d 'build paths to exclude' -r -F
 complete -c x -n "__fish_x_using_subcommand dist" -l skip -d 'build paths to skip' -r -F
-complete -c x -n "__fish_x_using_subcommand dist" -l rustc-error-format -r -f
+complete -c x -n "__fish_x_using_subcommand dist" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand dist" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x -n "__fish_x_using_subcommand dist" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x -n "__fish_x_using_subcommand dist" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -473,7 +462,6 @@ complete -c x -n "__fish_x_using_subcommand dist" -l keep-stage-std -d 'stage(s)
 complete -c x -n "__fish_x_using_subcommand dist" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x -n "__fish_x_using_subcommand dist" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x -n "__fish_x_using_subcommand dist" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x -n "__fish_x_using_subcommand dist" -l error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand dist" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x -n "__fish_x_using_subcommand dist" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x -n "__fish_x_using_subcommand dist" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -500,7 +488,7 @@ complete -c x -n "__fish_x_using_subcommand install" -l host -d 'host targets to
 complete -c x -n "__fish_x_using_subcommand install" -l target -d 'target targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand install" -l exclude -d 'build paths to exclude' -r -F
 complete -c x -n "__fish_x_using_subcommand install" -l skip -d 'build paths to skip' -r -F
-complete -c x -n "__fish_x_using_subcommand install" -l rustc-error-format -r -f
+complete -c x -n "__fish_x_using_subcommand install" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand install" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x -n "__fish_x_using_subcommand install" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x -n "__fish_x_using_subcommand install" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -508,7 +496,6 @@ complete -c x -n "__fish_x_using_subcommand install" -l keep-stage-std -d 'stage
 complete -c x -n "__fish_x_using_subcommand install" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x -n "__fish_x_using_subcommand install" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x -n "__fish_x_using_subcommand install" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x -n "__fish_x_using_subcommand install" -l error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand install" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x -n "__fish_x_using_subcommand install" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x -n "__fish_x_using_subcommand install" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -536,7 +523,7 @@ complete -c x -n "__fish_x_using_subcommand run" -l host -d 'host targets to bui
 complete -c x -n "__fish_x_using_subcommand run" -l target -d 'target targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand run" -l exclude -d 'build paths to exclude' -r -F
 complete -c x -n "__fish_x_using_subcommand run" -l skip -d 'build paths to skip' -r -F
-complete -c x -n "__fish_x_using_subcommand run" -l rustc-error-format -r -f
+complete -c x -n "__fish_x_using_subcommand run" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand run" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x -n "__fish_x_using_subcommand run" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x -n "__fish_x_using_subcommand run" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -544,7 +531,6 @@ complete -c x -n "__fish_x_using_subcommand run" -l keep-stage-std -d 'stage(s)
 complete -c x -n "__fish_x_using_subcommand run" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x -n "__fish_x_using_subcommand run" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x -n "__fish_x_using_subcommand run" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x -n "__fish_x_using_subcommand run" -l error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand run" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x -n "__fish_x_using_subcommand run" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x -n "__fish_x_using_subcommand run" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -571,7 +557,7 @@ complete -c x -n "__fish_x_using_subcommand setup" -l host -d 'host targets to b
 complete -c x -n "__fish_x_using_subcommand setup" -l target -d 'target targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand setup" -l exclude -d 'build paths to exclude' -r -F
 complete -c x -n "__fish_x_using_subcommand setup" -l skip -d 'build paths to skip' -r -F
-complete -c x -n "__fish_x_using_subcommand setup" -l rustc-error-format -r -f
+complete -c x -n "__fish_x_using_subcommand setup" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand setup" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x -n "__fish_x_using_subcommand setup" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x -n "__fish_x_using_subcommand setup" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -579,7 +565,6 @@ complete -c x -n "__fish_x_using_subcommand setup" -l keep-stage-std -d 'stage(s
 complete -c x -n "__fish_x_using_subcommand setup" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x -n "__fish_x_using_subcommand setup" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x -n "__fish_x_using_subcommand setup" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x -n "__fish_x_using_subcommand setup" -l error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand setup" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x -n "__fish_x_using_subcommand setup" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x -n "__fish_x_using_subcommand setup" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -606,7 +591,7 @@ complete -c x -n "__fish_x_using_subcommand suggest" -l host -d 'host targets to
 complete -c x -n "__fish_x_using_subcommand suggest" -l target -d 'target targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand suggest" -l exclude -d 'build paths to exclude' -r -F
 complete -c x -n "__fish_x_using_subcommand suggest" -l skip -d 'build paths to skip' -r -F
-complete -c x -n "__fish_x_using_subcommand suggest" -l rustc-error-format -r -f
+complete -c x -n "__fish_x_using_subcommand suggest" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand suggest" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x -n "__fish_x_using_subcommand suggest" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x -n "__fish_x_using_subcommand suggest" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -614,7 +599,6 @@ complete -c x -n "__fish_x_using_subcommand suggest" -l keep-stage-std -d 'stage
 complete -c x -n "__fish_x_using_subcommand suggest" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x -n "__fish_x_using_subcommand suggest" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x -n "__fish_x_using_subcommand suggest" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x -n "__fish_x_using_subcommand suggest" -l error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand suggest" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x -n "__fish_x_using_subcommand suggest" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x -n "__fish_x_using_subcommand suggest" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -643,7 +627,7 @@ complete -c x -n "__fish_x_using_subcommand vendor" -l host -d 'host targets to
 complete -c x -n "__fish_x_using_subcommand vendor" -l target -d 'target targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand vendor" -l exclude -d 'build paths to exclude' -r -F
 complete -c x -n "__fish_x_using_subcommand vendor" -l skip -d 'build paths to skip' -r -F
-complete -c x -n "__fish_x_using_subcommand vendor" -l rustc-error-format -r -f
+complete -c x -n "__fish_x_using_subcommand vendor" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand vendor" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x -n "__fish_x_using_subcommand vendor" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x -n "__fish_x_using_subcommand vendor" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -651,7 +635,6 @@ complete -c x -n "__fish_x_using_subcommand vendor" -l keep-stage-std -d 'stage(
 complete -c x -n "__fish_x_using_subcommand vendor" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x -n "__fish_x_using_subcommand vendor" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x -n "__fish_x_using_subcommand vendor" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x -n "__fish_x_using_subcommand vendor" -l error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand vendor" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x -n "__fish_x_using_subcommand vendor" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x -n "__fish_x_using_subcommand vendor" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -679,7 +662,7 @@ complete -c x -n "__fish_x_using_subcommand perf; and not __fish_seen_subcommand
 complete -c x -n "__fish_x_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l target -d 'target targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l exclude -d 'build paths to exclude' -r -F
 complete -c x -n "__fish_x_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l skip -d 'build paths to skip' -r -F
-complete -c x -n "__fish_x_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l rustc-error-format -r -f
+complete -c x -n "__fish_x_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x -n "__fish_x_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -687,7 +670,6 @@ complete -c x -n "__fish_x_using_subcommand perf; and not __fish_seen_subcommand
 complete -c x -n "__fish_x_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x -n "__fish_x_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x -n "__fish_x_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x -n "__fish_x_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x -n "__fish_x_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -722,7 +704,7 @@ complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_fro
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l host -d 'host targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l target -d 'target targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l skip -d 'build paths to skip' -r -F
-complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l rustc-error-format -r -f
+complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -730,7 +712,6 @@ complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_fro
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -760,7 +741,7 @@ complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_fro
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from samply" -l host -d 'host targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from samply" -l target -d 'target targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from samply" -l skip -d 'build paths to skip' -r -F
-complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from samply" -l rustc-error-format -r -f
+complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from samply" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from samply" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from samply" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from samply" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -768,7 +749,6 @@ complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_fro
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from samply" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from samply" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from samply" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from samply" -l error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from samply" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from samply" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from samply" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -798,7 +778,7 @@ complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_fro
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l host -d 'host targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l target -d 'target targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l skip -d 'build paths to skip' -r -F
-complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l rustc-error-format -r -f
+complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -806,7 +786,6 @@ complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_fro
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -836,7 +815,7 @@ complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_fro
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l host -d 'host targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l target -d 'target targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l skip -d 'build paths to skip' -r -F
-complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l rustc-error-format -r -f
+complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -844,7 +823,6 @@ complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_fro
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -871,7 +849,7 @@ complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_fro
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from compare" -l target -d 'target targets to build' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from compare" -l exclude -d 'build paths to exclude' -r -F
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from compare" -l skip -d 'build paths to skip' -r -F
-complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from compare" -l rustc-error-format -r -f
+complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from compare" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from compare" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from compare" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from compare" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -879,7 +857,6 @@ complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_fro
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from compare" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from compare" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from compare" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from compare" -l error-format -d 'rustc error format' -r -f
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from compare" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from compare" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x -n "__fish_x_using_subcommand perf; and __fish_seen_subcommand_from compare" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
diff --git a/src/etc/completions/x.ps1 b/src/etc/completions/x.ps1
index a891a9db33211..1ca00bb67dfed 100644
--- a/src/etc/completions/x.ps1
+++ b/src/etc/completions/x.ps1
@@ -28,7 +28,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -37,7 +37,6 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -87,7 +86,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -96,7 +95,6 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -129,7 +127,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -138,7 +136,6 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -176,7 +173,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -185,7 +182,6 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -221,7 +217,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -230,7 +226,6 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -263,7 +258,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -272,7 +267,6 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -307,7 +301,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -316,7 +310,6 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -357,7 +350,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -366,7 +359,6 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -408,7 +400,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -417,7 +409,6 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -454,7 +445,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -463,7 +454,6 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -497,7 +487,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
             [CompletionResult]::new('--keep-stage-std', '--keep-stage-std', [CompletionResultType]::ParameterName, 'stage(s) of the standard library to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -505,7 +495,6 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -539,7 +528,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -548,7 +537,6 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -581,7 +569,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -590,7 +578,6 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -624,7 +611,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -633,7 +620,6 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -666,7 +652,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -675,7 +661,6 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -708,7 +693,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -717,7 +702,6 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -752,7 +736,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -761,7 +745,6 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -795,7 +778,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -804,7 +787,6 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -845,7 +827,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--host', '--host', [CompletionResultType]::ParameterName, 'host targets to build')
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -854,7 +836,6 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -890,7 +871,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--host', '--host', [CompletionResultType]::ParameterName, 'host targets to build')
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -899,7 +880,6 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -935,7 +915,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--host', '--host', [CompletionResultType]::ParameterName, 'host targets to build')
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -944,7 +924,6 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -980,7 +959,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--host', '--host', [CompletionResultType]::ParameterName, 'host targets to build')
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -989,7 +968,6 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -1022,7 +1000,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -1031,7 +1009,6 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
diff --git a/src/etc/completions/x.py.fish b/src/etc/completions/x.py.fish
index e6326fcb0bb82..64734d5bcaa6e 100644
--- a/src/etc/completions/x.py.fish
+++ b/src/etc/completions/x.py.fish
@@ -1,6 +1,6 @@
 # Print an optspec for argparse to handle cmd's options that are independent of any subcommand.
 function __fish_x.py_global_optspecs
-	string join \n v/verbose i/incremental config= build-dir= build= host= target= exclude= skip= include-default-paths rustc-error-format= on-fail= dry-run dump-bootstrap-shims stage= keep-stage= keep-stage-std= src= j/jobs= warnings= error-format= json-output color= bypass-bootstrap-lock rust-profile-generate= rust-profile-use= llvm-profile-use= llvm-profile-generate enable-bolt-settings skip-stage0-validation reproducible-artifact= set= ci= skip-std-check-if-no-download-rustc h/help
+	string join \n v/verbose i/incremental config= build-dir= build= host= target= exclude= skip= include-default-paths rustc-error-format= on-fail= dry-run dump-bootstrap-shims stage= keep-stage= keep-stage-std= src= j/jobs= warnings= json-output color= bypass-bootstrap-lock rust-profile-generate= rust-profile-use= llvm-profile-use= llvm-profile-generate enable-bolt-settings skip-stage0-validation reproducible-artifact= set= ci= skip-std-check-if-no-download-rustc h/help
 end
 
 function __fish_x.py_needs_command
@@ -31,7 +31,7 @@ complete -c x.py -n "__fish_x.py_needs_command" -l host -d 'host targets to buil
 complete -c x.py -n "__fish_x.py_needs_command" -l target -d 'target targets to build' -r -f
 complete -c x.py -n "__fish_x.py_needs_command" -l exclude -d 'build paths to exclude' -r -F
 complete -c x.py -n "__fish_x.py_needs_command" -l skip -d 'build paths to skip' -r -F
-complete -c x.py -n "__fish_x.py_needs_command" -l rustc-error-format -r -f
+complete -c x.py -n "__fish_x.py_needs_command" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_needs_command" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x.py -n "__fish_x.py_needs_command" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x.py -n "__fish_x.py_needs_command" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -39,7 +39,6 @@ complete -c x.py -n "__fish_x.py_needs_command" -l keep-stage-std -d 'stage(s) o
 complete -c x.py -n "__fish_x.py_needs_command" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_x.py_needs_command" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x.py -n "__fish_x.py_needs_command" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x.py -n "__fish_x.py_needs_command" -l error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_needs_command" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x.py -n "__fish_x.py_needs_command" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x.py -n "__fish_x.py_needs_command" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -83,7 +82,7 @@ complete -c x.py -n "__fish_x.py_using_subcommand build" -l host -d 'host target
 complete -c x.py -n "__fish_x.py_using_subcommand build" -l target -d 'target targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand build" -l exclude -d 'build paths to exclude' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand build" -l skip -d 'build paths to skip' -r -F
-complete -c x.py -n "__fish_x.py_using_subcommand build" -l rustc-error-format -r -f
+complete -c x.py -n "__fish_x.py_using_subcommand build" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand build" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x.py -n "__fish_x.py_using_subcommand build" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand build" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -91,7 +90,6 @@ complete -c x.py -n "__fish_x.py_using_subcommand build" -l keep-stage-std -d 's
 complete -c x.py -n "__fish_x.py_using_subcommand build" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_x.py_using_subcommand build" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand build" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x.py -n "__fish_x.py_using_subcommand build" -l error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand build" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x.py -n "__fish_x.py_using_subcommand build" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand build" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -118,7 +116,7 @@ complete -c x.py -n "__fish_x.py_using_subcommand check" -l host -d 'host target
 complete -c x.py -n "__fish_x.py_using_subcommand check" -l target -d 'target targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand check" -l exclude -d 'build paths to exclude' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand check" -l skip -d 'build paths to skip' -r -F
-complete -c x.py -n "__fish_x.py_using_subcommand check" -l rustc-error-format -r -f
+complete -c x.py -n "__fish_x.py_using_subcommand check" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand check" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x.py -n "__fish_x.py_using_subcommand check" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand check" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -126,7 +124,6 @@ complete -c x.py -n "__fish_x.py_using_subcommand check" -l keep-stage-std -d 's
 complete -c x.py -n "__fish_x.py_using_subcommand check" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_x.py_using_subcommand check" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand check" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x.py -n "__fish_x.py_using_subcommand check" -l error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand check" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x.py -n "__fish_x.py_using_subcommand check" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand check" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -158,7 +155,7 @@ complete -c x.py -n "__fish_x.py_using_subcommand clippy" -l host -d 'host targe
 complete -c x.py -n "__fish_x.py_using_subcommand clippy" -l target -d 'target targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand clippy" -l exclude -d 'build paths to exclude' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand clippy" -l skip -d 'build paths to skip' -r -F
-complete -c x.py -n "__fish_x.py_using_subcommand clippy" -l rustc-error-format -r -f
+complete -c x.py -n "__fish_x.py_using_subcommand clippy" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand clippy" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x.py -n "__fish_x.py_using_subcommand clippy" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand clippy" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -166,7 +163,6 @@ complete -c x.py -n "__fish_x.py_using_subcommand clippy" -l keep-stage-std -d '
 complete -c x.py -n "__fish_x.py_using_subcommand clippy" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_x.py_using_subcommand clippy" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand clippy" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x.py -n "__fish_x.py_using_subcommand clippy" -l error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand clippy" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x.py -n "__fish_x.py_using_subcommand clippy" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand clippy" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -196,7 +192,7 @@ complete -c x.py -n "__fish_x.py_using_subcommand fix" -l host -d 'host targets
 complete -c x.py -n "__fish_x.py_using_subcommand fix" -l target -d 'target targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand fix" -l exclude -d 'build paths to exclude' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand fix" -l skip -d 'build paths to skip' -r -F
-complete -c x.py -n "__fish_x.py_using_subcommand fix" -l rustc-error-format -r -f
+complete -c x.py -n "__fish_x.py_using_subcommand fix" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand fix" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x.py -n "__fish_x.py_using_subcommand fix" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand fix" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -204,7 +200,6 @@ complete -c x.py -n "__fish_x.py_using_subcommand fix" -l keep-stage-std -d 'sta
 complete -c x.py -n "__fish_x.py_using_subcommand fix" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_x.py_using_subcommand fix" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand fix" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x.py -n "__fish_x.py_using_subcommand fix" -l error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand fix" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x.py -n "__fish_x.py_using_subcommand fix" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand fix" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -231,7 +226,7 @@ complete -c x.py -n "__fish_x.py_using_subcommand fmt" -l host -d 'host targets
 complete -c x.py -n "__fish_x.py_using_subcommand fmt" -l target -d 'target targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand fmt" -l exclude -d 'build paths to exclude' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand fmt" -l skip -d 'build paths to skip' -r -F
-complete -c x.py -n "__fish_x.py_using_subcommand fmt" -l rustc-error-format -r -f
+complete -c x.py -n "__fish_x.py_using_subcommand fmt" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand fmt" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x.py -n "__fish_x.py_using_subcommand fmt" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand fmt" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -239,7 +234,6 @@ complete -c x.py -n "__fish_x.py_using_subcommand fmt" -l keep-stage-std -d 'sta
 complete -c x.py -n "__fish_x.py_using_subcommand fmt" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_x.py_using_subcommand fmt" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand fmt" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x.py -n "__fish_x.py_using_subcommand fmt" -l error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand fmt" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x.py -n "__fish_x.py_using_subcommand fmt" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand fmt" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -268,7 +262,7 @@ complete -c x.py -n "__fish_x.py_using_subcommand doc" -l host -d 'host targets
 complete -c x.py -n "__fish_x.py_using_subcommand doc" -l target -d 'target targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand doc" -l exclude -d 'build paths to exclude' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand doc" -l skip -d 'build paths to skip' -r -F
-complete -c x.py -n "__fish_x.py_using_subcommand doc" -l rustc-error-format -r -f
+complete -c x.py -n "__fish_x.py_using_subcommand doc" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand doc" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x.py -n "__fish_x.py_using_subcommand doc" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand doc" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -276,7 +270,6 @@ complete -c x.py -n "__fish_x.py_using_subcommand doc" -l keep-stage-std -d 'sta
 complete -c x.py -n "__fish_x.py_using_subcommand doc" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_x.py_using_subcommand doc" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand doc" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x.py -n "__fish_x.py_using_subcommand doc" -l error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand doc" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x.py -n "__fish_x.py_using_subcommand doc" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand doc" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -311,7 +304,7 @@ complete -c x.py -n "__fish_x.py_using_subcommand test" -l host -d 'host targets
 complete -c x.py -n "__fish_x.py_using_subcommand test" -l target -d 'target targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand test" -l exclude -d 'build paths to exclude' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand test" -l skip -d 'build paths to skip' -r -F
-complete -c x.py -n "__fish_x.py_using_subcommand test" -l rustc-error-format -r -f
+complete -c x.py -n "__fish_x.py_using_subcommand test" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand test" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x.py -n "__fish_x.py_using_subcommand test" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand test" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -319,7 +312,6 @@ complete -c x.py -n "__fish_x.py_using_subcommand test" -l keep-stage-std -d 'st
 complete -c x.py -n "__fish_x.py_using_subcommand test" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_x.py_using_subcommand test" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand test" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x.py -n "__fish_x.py_using_subcommand test" -l error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand test" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x.py -n "__fish_x.py_using_subcommand test" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand test" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -355,7 +347,7 @@ complete -c x.py -n "__fish_x.py_using_subcommand miri" -l host -d 'host targets
 complete -c x.py -n "__fish_x.py_using_subcommand miri" -l target -d 'target targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand miri" -l exclude -d 'build paths to exclude' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand miri" -l skip -d 'build paths to skip' -r -F
-complete -c x.py -n "__fish_x.py_using_subcommand miri" -l rustc-error-format -r -f
+complete -c x.py -n "__fish_x.py_using_subcommand miri" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand miri" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x.py -n "__fish_x.py_using_subcommand miri" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand miri" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -363,7 +355,6 @@ complete -c x.py -n "__fish_x.py_using_subcommand miri" -l keep-stage-std -d 'st
 complete -c x.py -n "__fish_x.py_using_subcommand miri" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_x.py_using_subcommand miri" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand miri" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x.py -n "__fish_x.py_using_subcommand miri" -l error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand miri" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x.py -n "__fish_x.py_using_subcommand miri" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand miri" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -394,7 +385,7 @@ complete -c x.py -n "__fish_x.py_using_subcommand bench" -l host -d 'host target
 complete -c x.py -n "__fish_x.py_using_subcommand bench" -l target -d 'target targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand bench" -l exclude -d 'build paths to exclude' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand bench" -l skip -d 'build paths to skip' -r -F
-complete -c x.py -n "__fish_x.py_using_subcommand bench" -l rustc-error-format -r -f
+complete -c x.py -n "__fish_x.py_using_subcommand bench" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand bench" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x.py -n "__fish_x.py_using_subcommand bench" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand bench" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -402,7 +393,6 @@ complete -c x.py -n "__fish_x.py_using_subcommand bench" -l keep-stage-std -d 's
 complete -c x.py -n "__fish_x.py_using_subcommand bench" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_x.py_using_subcommand bench" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand bench" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x.py -n "__fish_x.py_using_subcommand bench" -l error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand bench" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x.py -n "__fish_x.py_using_subcommand bench" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand bench" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -430,14 +420,13 @@ complete -c x.py -n "__fish_x.py_using_subcommand clean" -l host -d 'host target
 complete -c x.py -n "__fish_x.py_using_subcommand clean" -l target -d 'target targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand clean" -l exclude -d 'build paths to exclude' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand clean" -l skip -d 'build paths to skip' -r -F
-complete -c x.py -n "__fish_x.py_using_subcommand clean" -l rustc-error-format -r -f
+complete -c x.py -n "__fish_x.py_using_subcommand clean" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand clean" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x.py -n "__fish_x.py_using_subcommand clean" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand clean" -l keep-stage-std -d 'stage(s) of the standard library to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand clean" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_x.py_using_subcommand clean" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand clean" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x.py -n "__fish_x.py_using_subcommand clean" -l error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand clean" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x.py -n "__fish_x.py_using_subcommand clean" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand clean" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -465,7 +454,7 @@ complete -c x.py -n "__fish_x.py_using_subcommand dist" -l host -d 'host targets
 complete -c x.py -n "__fish_x.py_using_subcommand dist" -l target -d 'target targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand dist" -l exclude -d 'build paths to exclude' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand dist" -l skip -d 'build paths to skip' -r -F
-complete -c x.py -n "__fish_x.py_using_subcommand dist" -l rustc-error-format -r -f
+complete -c x.py -n "__fish_x.py_using_subcommand dist" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand dist" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x.py -n "__fish_x.py_using_subcommand dist" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand dist" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -473,7 +462,6 @@ complete -c x.py -n "__fish_x.py_using_subcommand dist" -l keep-stage-std -d 'st
 complete -c x.py -n "__fish_x.py_using_subcommand dist" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_x.py_using_subcommand dist" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand dist" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x.py -n "__fish_x.py_using_subcommand dist" -l error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand dist" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x.py -n "__fish_x.py_using_subcommand dist" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand dist" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -500,7 +488,7 @@ complete -c x.py -n "__fish_x.py_using_subcommand install" -l host -d 'host targ
 complete -c x.py -n "__fish_x.py_using_subcommand install" -l target -d 'target targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand install" -l exclude -d 'build paths to exclude' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand install" -l skip -d 'build paths to skip' -r -F
-complete -c x.py -n "__fish_x.py_using_subcommand install" -l rustc-error-format -r -f
+complete -c x.py -n "__fish_x.py_using_subcommand install" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand install" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x.py -n "__fish_x.py_using_subcommand install" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand install" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -508,7 +496,6 @@ complete -c x.py -n "__fish_x.py_using_subcommand install" -l keep-stage-std -d
 complete -c x.py -n "__fish_x.py_using_subcommand install" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_x.py_using_subcommand install" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand install" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x.py -n "__fish_x.py_using_subcommand install" -l error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand install" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x.py -n "__fish_x.py_using_subcommand install" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand install" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -536,7 +523,7 @@ complete -c x.py -n "__fish_x.py_using_subcommand run" -l host -d 'host targets
 complete -c x.py -n "__fish_x.py_using_subcommand run" -l target -d 'target targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand run" -l exclude -d 'build paths to exclude' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand run" -l skip -d 'build paths to skip' -r -F
-complete -c x.py -n "__fish_x.py_using_subcommand run" -l rustc-error-format -r -f
+complete -c x.py -n "__fish_x.py_using_subcommand run" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand run" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x.py -n "__fish_x.py_using_subcommand run" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand run" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -544,7 +531,6 @@ complete -c x.py -n "__fish_x.py_using_subcommand run" -l keep-stage-std -d 'sta
 complete -c x.py -n "__fish_x.py_using_subcommand run" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_x.py_using_subcommand run" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand run" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x.py -n "__fish_x.py_using_subcommand run" -l error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand run" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x.py -n "__fish_x.py_using_subcommand run" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand run" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -571,7 +557,7 @@ complete -c x.py -n "__fish_x.py_using_subcommand setup" -l host -d 'host target
 complete -c x.py -n "__fish_x.py_using_subcommand setup" -l target -d 'target targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand setup" -l exclude -d 'build paths to exclude' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand setup" -l skip -d 'build paths to skip' -r -F
-complete -c x.py -n "__fish_x.py_using_subcommand setup" -l rustc-error-format -r -f
+complete -c x.py -n "__fish_x.py_using_subcommand setup" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand setup" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x.py -n "__fish_x.py_using_subcommand setup" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand setup" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -579,7 +565,6 @@ complete -c x.py -n "__fish_x.py_using_subcommand setup" -l keep-stage-std -d 's
 complete -c x.py -n "__fish_x.py_using_subcommand setup" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_x.py_using_subcommand setup" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand setup" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x.py -n "__fish_x.py_using_subcommand setup" -l error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand setup" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x.py -n "__fish_x.py_using_subcommand setup" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand setup" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -606,7 +591,7 @@ complete -c x.py -n "__fish_x.py_using_subcommand suggest" -l host -d 'host targ
 complete -c x.py -n "__fish_x.py_using_subcommand suggest" -l target -d 'target targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand suggest" -l exclude -d 'build paths to exclude' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand suggest" -l skip -d 'build paths to skip' -r -F
-complete -c x.py -n "__fish_x.py_using_subcommand suggest" -l rustc-error-format -r -f
+complete -c x.py -n "__fish_x.py_using_subcommand suggest" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand suggest" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x.py -n "__fish_x.py_using_subcommand suggest" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand suggest" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -614,7 +599,6 @@ complete -c x.py -n "__fish_x.py_using_subcommand suggest" -l keep-stage-std -d
 complete -c x.py -n "__fish_x.py_using_subcommand suggest" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_x.py_using_subcommand suggest" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand suggest" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x.py -n "__fish_x.py_using_subcommand suggest" -l error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand suggest" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x.py -n "__fish_x.py_using_subcommand suggest" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand suggest" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -643,7 +627,7 @@ complete -c x.py -n "__fish_x.py_using_subcommand vendor" -l host -d 'host targe
 complete -c x.py -n "__fish_x.py_using_subcommand vendor" -l target -d 'target targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand vendor" -l exclude -d 'build paths to exclude' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand vendor" -l skip -d 'build paths to skip' -r -F
-complete -c x.py -n "__fish_x.py_using_subcommand vendor" -l rustc-error-format -r -f
+complete -c x.py -n "__fish_x.py_using_subcommand vendor" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand vendor" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x.py -n "__fish_x.py_using_subcommand vendor" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand vendor" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -651,7 +635,6 @@ complete -c x.py -n "__fish_x.py_using_subcommand vendor" -l keep-stage-std -d '
 complete -c x.py -n "__fish_x.py_using_subcommand vendor" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_x.py_using_subcommand vendor" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand vendor" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x.py -n "__fish_x.py_using_subcommand vendor" -l error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand vendor" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x.py -n "__fish_x.py_using_subcommand vendor" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand vendor" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -679,7 +662,7 @@ complete -c x.py -n "__fish_x.py_using_subcommand perf; and not __fish_seen_subc
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l target -d 'target targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l exclude -d 'build paths to exclude' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l skip -d 'build paths to skip' -r -F
-complete -c x.py -n "__fish_x.py_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l rustc-error-format -r -f
+complete -c x.py -n "__fish_x.py_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -687,7 +670,6 @@ complete -c x.py -n "__fish_x.py_using_subcommand perf; and not __fish_seen_subc
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x.py -n "__fish_x.py_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and not __fish_seen_subcommand_from eprintln samply cachegrind benchmark compare" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -722,7 +704,7 @@ complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcomma
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l host -d 'host targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l target -d 'target targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l skip -d 'build paths to skip' -r -F
-complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l rustc-error-format -r -f
+complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -730,7 +712,6 @@ complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcomma
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from eprintln" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -760,7 +741,7 @@ complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcomma
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from samply" -l host -d 'host targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from samply" -l target -d 'target targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from samply" -l skip -d 'build paths to skip' -r -F
-complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from samply" -l rustc-error-format -r -f
+complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from samply" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from samply" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from samply" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from samply" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -768,7 +749,6 @@ complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcomma
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from samply" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from samply" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from samply" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from samply" -l error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from samply" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from samply" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from samply" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -798,7 +778,7 @@ complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcomma
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l host -d 'host targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l target -d 'target targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l skip -d 'build paths to skip' -r -F
-complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l rustc-error-format -r -f
+complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -806,7 +786,6 @@ complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcomma
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from cachegrind" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -836,7 +815,7 @@ complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcomma
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l host -d 'host targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l target -d 'target targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l skip -d 'build paths to skip' -r -F
-complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l rustc-error-format -r -f
+complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -844,7 +823,6 @@ complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcomma
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from benchmark" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
@@ -871,7 +849,7 @@ complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcomma
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from compare" -l target -d 'target targets to build' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from compare" -l exclude -d 'build paths to exclude' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from compare" -l skip -d 'build paths to skip' -r -F
-complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from compare" -l rustc-error-format -r -f
+complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from compare" -l rustc-error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from compare" -l on-fail -d 'command to run on failure' -r -f -a "(__fish_complete_command)"
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from compare" -l stage -d 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from compare" -l keep-stage -d 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)' -r -f
@@ -879,7 +857,6 @@ complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcomma
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from compare" -l src -d 'path to the root of the rust checkout' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from compare" -s j -l jobs -d 'number of jobs to run in parallel' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from compare" -l warnings -d 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour' -r -f -a "{deny\t'',warn\t'',default\t''}"
-complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from compare" -l error-format -d 'rustc error format' -r -f
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from compare" -l color -d 'whether to use color in cargo and rustc output' -r -f -a "{always\t'',never\t'',auto\t''}"
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from compare" -l rust-profile-generate -d 'generate PGO profile with rustc build' -r -F
 complete -c x.py -n "__fish_x.py_using_subcommand perf; and __fish_seen_subcommand_from compare" -l rust-profile-use -d 'use PGO profile for rustc build' -r -F
diff --git a/src/etc/completions/x.py.ps1 b/src/etc/completions/x.py.ps1
index ee3373b9e75b0..154f4f95eb51d 100644
--- a/src/etc/completions/x.py.ps1
+++ b/src/etc/completions/x.py.ps1
@@ -28,7 +28,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -37,7 +37,6 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -87,7 +86,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -96,7 +95,6 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -129,7 +127,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -138,7 +136,6 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -176,7 +173,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -185,7 +182,6 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -221,7 +217,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -230,7 +226,6 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -263,7 +258,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -272,7 +267,6 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -307,7 +301,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -316,7 +310,6 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -357,7 +350,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -366,7 +359,6 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -408,7 +400,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -417,7 +409,6 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -454,7 +445,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -463,7 +454,6 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -497,7 +487,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
             [CompletionResult]::new('--keep-stage-std', '--keep-stage-std', [CompletionResultType]::ParameterName, 'stage(s) of the standard library to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -505,7 +495,6 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -539,7 +528,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -548,7 +537,6 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -581,7 +569,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -590,7 +578,6 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -624,7 +611,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -633,7 +620,6 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -666,7 +652,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -675,7 +661,6 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -708,7 +693,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -717,7 +702,6 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -752,7 +736,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -761,7 +745,6 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -795,7 +778,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -804,7 +787,6 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -845,7 +827,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--host', '--host', [CompletionResultType]::ParameterName, 'host targets to build')
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -854,7 +836,6 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -890,7 +871,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--host', '--host', [CompletionResultType]::ParameterName, 'host targets to build')
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -899,7 +880,6 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -935,7 +915,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--host', '--host', [CompletionResultType]::ParameterName, 'host targets to build')
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -944,7 +924,6 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -980,7 +959,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--host', '--host', [CompletionResultType]::ParameterName, 'host targets to build')
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -989,7 +968,6 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
@@ -1022,7 +1000,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--target', '--target', [CompletionResultType]::ParameterName, 'target targets to build')
             [CompletionResult]::new('--exclude', '--exclude', [CompletionResultType]::ParameterName, 'build paths to exclude')
             [CompletionResult]::new('--skip', '--skip', [CompletionResultType]::ParameterName, 'build paths to skip')
-            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc-error-format')
+            [CompletionResult]::new('--rustc-error-format', '--rustc-error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--on-fail', '--on-fail', [CompletionResultType]::ParameterName, 'command to run on failure')
             [CompletionResult]::new('--stage', '--stage', [CompletionResultType]::ParameterName, 'stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)')
             [CompletionResult]::new('--keep-stage', '--keep-stage', [CompletionResultType]::ParameterName, 'stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)')
@@ -1031,7 +1009,6 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('-j', '-j', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--jobs', '--jobs', [CompletionResultType]::ParameterName, 'number of jobs to run in parallel')
             [CompletionResult]::new('--warnings', '--warnings', [CompletionResultType]::ParameterName, 'if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour')
-            [CompletionResult]::new('--error-format', '--error-format', [CompletionResultType]::ParameterName, 'rustc error format')
             [CompletionResult]::new('--color', '--color', [CompletionResultType]::ParameterName, 'whether to use color in cargo and rustc output')
             [CompletionResult]::new('--rust-profile-generate', '--rust-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with rustc build')
             [CompletionResult]::new('--rust-profile-use', '--rust-profile-use', [CompletionResultType]::ParameterName, 'use PGO profile for rustc build')
diff --git a/src/etc/completions/x.py.sh b/src/etc/completions/x.py.sh
index 568bf2fcc6dc3..fe4ed5c915f01 100644
--- a/src/etc/completions/x.py.sh
+++ b/src/etc/completions/x.py.sh
@@ -85,7 +85,7 @@ _x.py() {
 
     case "${cmd}" in
         x.py)
-            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]... build check clippy fix fmt doc test miri bench clean dist install run setup suggest vendor perf"
+            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]... build check clippy fix fmt doc test miri bench clean dist install run setup suggest vendor perf"
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 1 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -199,13 +199,6 @@ _x.py() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -278,7 +271,7 @@ _x.py() {
             return 0
             ;;
         x.py__bench)
-            opts="-v -i -j -h --test-args --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --test-args --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -396,13 +389,6 @@ _x.py() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -475,7 +461,7 @@ _x.py() {
             return 0
             ;;
         x.py__build)
-            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -589,13 +575,6 @@ _x.py() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -668,7 +647,7 @@ _x.py() {
             return 0
             ;;
         x.py__check)
-            opts="-v -i -j -h --all-targets --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --all-targets --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -782,13 +761,6 @@ _x.py() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -861,7 +833,7 @@ _x.py() {
             return 0
             ;;
         x.py__clean)
-            opts="-v -i -j -h --all --stage --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --all --stage --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -972,13 +944,6 @@ _x.py() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -1051,7 +1016,7 @@ _x.py() {
             return 0
             ;;
         x.py__clippy)
-            opts="-A -D -W -F -v -i -j -h --fix --allow-dirty --allow-staged --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-A -D -W -F -v -i -j -h --fix --allow-dirty --allow-staged --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -1181,13 +1146,6 @@ _x.py() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -1260,7 +1218,7 @@ _x.py() {
             return 0
             ;;
         x.py__dist)
-            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -1374,13 +1332,6 @@ _x.py() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -1453,7 +1404,7 @@ _x.py() {
             return 0
             ;;
         x.py__doc)
-            opts="-v -i -j -h --open --json --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --open --json --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -1567,13 +1518,6 @@ _x.py() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -1646,7 +1590,7 @@ _x.py() {
             return 0
             ;;
         x.py__fix)
-            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -1760,13 +1704,6 @@ _x.py() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -1839,7 +1776,7 @@ _x.py() {
             return 0
             ;;
         x.py__fmt)
-            opts="-v -i -j -h --check --all --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --check --all --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -1953,13 +1890,6 @@ _x.py() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -2032,7 +1962,7 @@ _x.py() {
             return 0
             ;;
         x.py__install)
-            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -2146,13 +2076,6 @@ _x.py() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -2225,7 +2148,7 @@ _x.py() {
             return 0
             ;;
         x.py__miri)
-            opts="-v -i -j -h --no-fail-fast --test-args --no-doc --doc --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --no-fail-fast --test-args --no-doc --doc --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -2343,13 +2266,6 @@ _x.py() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -2422,7 +2338,7 @@ _x.py() {
             return 0
             ;;
         x.py__perf)
-            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]... eprintln samply cachegrind benchmark compare"
+            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]... eprintln samply cachegrind benchmark compare"
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -2536,13 +2452,6 @@ _x.py() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -2615,7 +2524,7 @@ _x.py() {
             return 0
             ;;
         x.py__perf__benchmark)
-            opts="-v -i -j -h --include --exclude --scenarios --profiles --verbose --incremental --config --build-dir --build --host --target --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help <benchmark-id> [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --include --exclude --scenarios --profiles --verbose --incremental --config --build-dir --build --host --target --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help <benchmark-id> [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 3 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -2741,13 +2650,6 @@ _x.py() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -2820,7 +2722,7 @@ _x.py() {
             return 0
             ;;
         x.py__perf__cachegrind)
-            opts="-v -i -j -h --include --exclude --scenarios --profiles --verbose --incremental --config --build-dir --build --host --target --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --include --exclude --scenarios --profiles --verbose --incremental --config --build-dir --build --host --target --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 3 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -2946,13 +2848,6 @@ _x.py() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -3025,7 +2920,7 @@ _x.py() {
             return 0
             ;;
         x.py__perf__compare)
-            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help <BASE> <MODIFIED> [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help <BASE> <MODIFIED> [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 3 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -3139,13 +3034,6 @@ _x.py() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -3218,7 +3106,7 @@ _x.py() {
             return 0
             ;;
         x.py__perf__eprintln)
-            opts="-v -i -j -h --include --exclude --scenarios --profiles --verbose --incremental --config --build-dir --build --host --target --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --include --exclude --scenarios --profiles --verbose --incremental --config --build-dir --build --host --target --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 3 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -3344,13 +3232,6 @@ _x.py() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -3423,7 +3304,7 @@ _x.py() {
             return 0
             ;;
         x.py__perf__samply)
-            opts="-v -i -j -h --include --exclude --scenarios --profiles --verbose --incremental --config --build-dir --build --host --target --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --include --exclude --scenarios --profiles --verbose --incremental --config --build-dir --build --host --target --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 3 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -3549,13 +3430,6 @@ _x.py() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -3628,7 +3502,7 @@ _x.py() {
             return 0
             ;;
         x.py__run)
-            opts="-v -i -j -h --args --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --args --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -3746,13 +3620,6 @@ _x.py() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -3825,7 +3692,7 @@ _x.py() {
             return 0
             ;;
         x.py__setup)
-            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [<PROFILE>|hook|editor|link] [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [<PROFILE>|hook|editor|link] [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -3939,13 +3806,6 @@ _x.py() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -4018,7 +3878,7 @@ _x.py() {
             return 0
             ;;
         x.py__suggest)
-            opts="-v -i -j -h --run --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --run --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -4132,13 +3992,6 @@ _x.py() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -4211,7 +4064,7 @@ _x.py() {
             return 0
             ;;
         x.py__test)
-            opts="-v -i -j -h --no-fail-fast --test-args --compiletest-rustc-args --no-doc --doc --bless --extra-checks --force-rerun --only-modified --compare-mode --pass --run --rustfix-coverage --no-capture --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --no-fail-fast --test-args --compiletest-rustc-args --no-doc --doc --bless --extra-checks --force-rerun --only-modified --compare-mode --pass --run --rustfix-coverage --no-capture --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -4349,13 +4202,6 @@ _x.py() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -4428,7 +4274,7 @@ _x.py() {
             return 0
             ;;
         x.py__vendor)
-            opts="-v -i -j -h --sync --versioned-dirs --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --sync --versioned-dirs --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -4546,13 +4392,6 @@ _x.py() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
diff --git a/src/etc/completions/x.py.zsh b/src/etc/completions/x.py.zsh
index 6dc0570819950..177d60f97381f 100644
--- a/src/etc/completions/x.py.zsh
+++ b/src/etc/completions/x.py.zsh
@@ -22,7 +22,7 @@ _x.py() {
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -31,7 +31,6 @@ _x.py() {
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -74,7 +73,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -83,7 +82,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -118,7 +116,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -127,7 +125,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -167,7 +164,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -176,7 +173,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -214,7 +210,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -223,7 +219,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -258,7 +253,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -267,7 +262,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -304,7 +298,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -313,7 +307,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -356,7 +349,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -365,7 +358,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -409,7 +401,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -418,7 +410,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -457,7 +448,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -466,7 +457,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -502,7 +492,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
 '*--keep-stage-std=[stage(s) of the standard library to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -510,7 +500,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -546,7 +535,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -555,7 +544,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -590,7 +578,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -599,7 +587,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -635,7 +622,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -644,7 +631,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -679,7 +665,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -688,7 +674,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -724,7 +709,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -733,7 +718,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -770,7 +754,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -779,7 +763,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -815,7 +798,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -824,7 +807,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -871,7 +853,7 @@ _arguments "${_arguments_options[@]}" : \
 '--host=[host targets to build]:HOST:' \
 '--target=[target targets to build]:TARGET:' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -880,7 +862,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -918,7 +899,7 @@ _arguments "${_arguments_options[@]}" : \
 '--host=[host targets to build]:HOST:' \
 '--target=[target targets to build]:TARGET:' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -927,7 +908,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -965,7 +945,7 @@ _arguments "${_arguments_options[@]}" : \
 '--host=[host targets to build]:HOST:' \
 '--target=[target targets to build]:TARGET:' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -974,7 +954,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -1012,7 +991,7 @@ _arguments "${_arguments_options[@]}" : \
 '--host=[host targets to build]:HOST:' \
 '--target=[target targets to build]:TARGET:' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -1021,7 +1000,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -1057,7 +1035,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -1066,7 +1044,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
diff --git a/src/etc/completions/x.sh b/src/etc/completions/x.sh
index d48c29e629885..105fc668e8e9d 100644
--- a/src/etc/completions/x.sh
+++ b/src/etc/completions/x.sh
@@ -85,7 +85,7 @@ _x() {
 
     case "${cmd}" in
         x)
-            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]... build check clippy fix fmt doc test miri bench clean dist install run setup suggest vendor perf"
+            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]... build check clippy fix fmt doc test miri bench clean dist install run setup suggest vendor perf"
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 1 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -199,13 +199,6 @@ _x() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -278,7 +271,7 @@ _x() {
             return 0
             ;;
         x__bench)
-            opts="-v -i -j -h --test-args --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --test-args --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -396,13 +389,6 @@ _x() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -475,7 +461,7 @@ _x() {
             return 0
             ;;
         x__build)
-            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -589,13 +575,6 @@ _x() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -668,7 +647,7 @@ _x() {
             return 0
             ;;
         x__check)
-            opts="-v -i -j -h --all-targets --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --all-targets --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -782,13 +761,6 @@ _x() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -861,7 +833,7 @@ _x() {
             return 0
             ;;
         x__clean)
-            opts="-v -i -j -h --all --stage --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --all --stage --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -972,13 +944,6 @@ _x() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -1051,7 +1016,7 @@ _x() {
             return 0
             ;;
         x__clippy)
-            opts="-A -D -W -F -v -i -j -h --fix --allow-dirty --allow-staged --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-A -D -W -F -v -i -j -h --fix --allow-dirty --allow-staged --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -1181,13 +1146,6 @@ _x() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -1260,7 +1218,7 @@ _x() {
             return 0
             ;;
         x__dist)
-            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -1374,13 +1332,6 @@ _x() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -1453,7 +1404,7 @@ _x() {
             return 0
             ;;
         x__doc)
-            opts="-v -i -j -h --open --json --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --open --json --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -1567,13 +1518,6 @@ _x() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -1646,7 +1590,7 @@ _x() {
             return 0
             ;;
         x__fix)
-            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -1760,13 +1704,6 @@ _x() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -1839,7 +1776,7 @@ _x() {
             return 0
             ;;
         x__fmt)
-            opts="-v -i -j -h --check --all --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --check --all --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -1953,13 +1890,6 @@ _x() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -2032,7 +1962,7 @@ _x() {
             return 0
             ;;
         x__install)
-            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -2146,13 +2076,6 @@ _x() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -2225,7 +2148,7 @@ _x() {
             return 0
             ;;
         x__miri)
-            opts="-v -i -j -h --no-fail-fast --test-args --no-doc --doc --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --no-fail-fast --test-args --no-doc --doc --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -2343,13 +2266,6 @@ _x() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -2422,7 +2338,7 @@ _x() {
             return 0
             ;;
         x__perf)
-            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]... eprintln samply cachegrind benchmark compare"
+            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]... eprintln samply cachegrind benchmark compare"
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -2536,13 +2452,6 @@ _x() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -2615,7 +2524,7 @@ _x() {
             return 0
             ;;
         x__perf__benchmark)
-            opts="-v -i -j -h --include --exclude --scenarios --profiles --verbose --incremental --config --build-dir --build --host --target --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help <benchmark-id> [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --include --exclude --scenarios --profiles --verbose --incremental --config --build-dir --build --host --target --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help <benchmark-id> [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 3 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -2741,13 +2650,6 @@ _x() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -2820,7 +2722,7 @@ _x() {
             return 0
             ;;
         x__perf__cachegrind)
-            opts="-v -i -j -h --include --exclude --scenarios --profiles --verbose --incremental --config --build-dir --build --host --target --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --include --exclude --scenarios --profiles --verbose --incremental --config --build-dir --build --host --target --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 3 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -2946,13 +2848,6 @@ _x() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -3025,7 +2920,7 @@ _x() {
             return 0
             ;;
         x__perf__compare)
-            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help <BASE> <MODIFIED> [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help <BASE> <MODIFIED> [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 3 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -3139,13 +3034,6 @@ _x() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -3218,7 +3106,7 @@ _x() {
             return 0
             ;;
         x__perf__eprintln)
-            opts="-v -i -j -h --include --exclude --scenarios --profiles --verbose --incremental --config --build-dir --build --host --target --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --include --exclude --scenarios --profiles --verbose --incremental --config --build-dir --build --host --target --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 3 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -3344,13 +3232,6 @@ _x() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -3423,7 +3304,7 @@ _x() {
             return 0
             ;;
         x__perf__samply)
-            opts="-v -i -j -h --include --exclude --scenarios --profiles --verbose --incremental --config --build-dir --build --host --target --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --include --exclude --scenarios --profiles --verbose --incremental --config --build-dir --build --host --target --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 3 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -3549,13 +3430,6 @@ _x() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -3628,7 +3502,7 @@ _x() {
             return 0
             ;;
         x__run)
-            opts="-v -i -j -h --args --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --args --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -3746,13 +3620,6 @@ _x() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -3825,7 +3692,7 @@ _x() {
             return 0
             ;;
         x__setup)
-            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [<PROFILE>|hook|editor|link] [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [<PROFILE>|hook|editor|link] [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -3939,13 +3806,6 @@ _x() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -4018,7 +3878,7 @@ _x() {
             return 0
             ;;
         x__suggest)
-            opts="-v -i -j -h --run --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --run --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -4132,13 +3992,6 @@ _x() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -4211,7 +4064,7 @@ _x() {
             return 0
             ;;
         x__test)
-            opts="-v -i -j -h --no-fail-fast --test-args --compiletest-rustc-args --no-doc --doc --bless --extra-checks --force-rerun --only-modified --compare-mode --pass --run --rustfix-coverage --no-capture --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --no-fail-fast --test-args --compiletest-rustc-args --no-doc --doc --bless --extra-checks --force-rerun --only-modified --compare-mode --pass --run --rustfix-coverage --no-capture --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -4349,13 +4202,6 @@ _x() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
@@ -4428,7 +4274,7 @@ _x() {
             return 0
             ;;
         x__vendor)
-            opts="-v -i -j -h --sync --versioned-dirs --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --sync --versioned-dirs --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -4546,13 +4392,6 @@ _x() {
                     COMPREPLY=($(compgen -W "deny warn default" -- "${cur}"))
                     return 0
                     ;;
-                --error-format)
-                    COMPREPLY=("${cur}")
-                    if [[ "${BASH_VERSINFO[0]}" -ge 4 ]]; then
-                        compopt -o nospace
-                    fi
-                    return 0
-                    ;;
                 --color)
                     COMPREPLY=($(compgen -W "always never auto" -- "${cur}"))
                     return 0
diff --git a/src/etc/completions/x.zsh b/src/etc/completions/x.zsh
index 869884bf1dcd2..00fb7d8e2ecbd 100644
--- a/src/etc/completions/x.zsh
+++ b/src/etc/completions/x.zsh
@@ -22,7 +22,7 @@ _x() {
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -31,7 +31,6 @@ _x() {
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -74,7 +73,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -83,7 +82,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -118,7 +116,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -127,7 +125,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -167,7 +164,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -176,7 +173,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -214,7 +210,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -223,7 +219,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -258,7 +253,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -267,7 +262,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -304,7 +298,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -313,7 +307,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -356,7 +349,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -365,7 +358,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -409,7 +401,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -418,7 +410,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -457,7 +448,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -466,7 +457,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -502,7 +492,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
 '*--keep-stage-std=[stage(s) of the standard library to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -510,7 +500,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -546,7 +535,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -555,7 +544,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -590,7 +578,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -599,7 +587,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -635,7 +622,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -644,7 +631,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -679,7 +665,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -688,7 +674,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -724,7 +709,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -733,7 +718,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -770,7 +754,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -779,7 +763,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -815,7 +798,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -824,7 +807,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -871,7 +853,7 @@ _arguments "${_arguments_options[@]}" : \
 '--host=[host targets to build]:HOST:' \
 '--target=[target targets to build]:TARGET:' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -880,7 +862,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -918,7 +899,7 @@ _arguments "${_arguments_options[@]}" : \
 '--host=[host targets to build]:HOST:' \
 '--target=[target targets to build]:TARGET:' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -927,7 +908,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -965,7 +945,7 @@ _arguments "${_arguments_options[@]}" : \
 '--host=[host targets to build]:HOST:' \
 '--target=[target targets to build]:TARGET:' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -974,7 +954,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -1012,7 +991,7 @@ _arguments "${_arguments_options[@]}" : \
 '--host=[host targets to build]:HOST:' \
 '--target=[target targets to build]:TARGET:' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -1021,7 +1000,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
@@ -1057,7 +1035,7 @@ _arguments "${_arguments_options[@]}" : \
 '--target=[target targets to build]:TARGET:' \
 '*--exclude=[build paths to exclude]:PATH:_files' \
 '*--skip=[build paths to skip]:PATH:_files' \
-'--rustc-error-format=[]:RUSTC_ERROR_FORMAT:' \
+'--rustc-error-format=[rustc error format]:RUSTC_ERROR_FORMAT:' \
 '--on-fail=[command to run on failure]:CMD:_cmdstring' \
 '--stage=[stage to build (indicates compiler to use/test, e.g., stage 0 uses the bootstrap compiler, stage 1 the stage 0 rustc artifacts, etc.)]:N:' \
 '*--keep-stage=[stage(s) to keep without recompiling (pass multiple times to keep e.g., both stages 0 and 1)]:N:' \
@@ -1066,7 +1044,6 @@ _arguments "${_arguments_options[@]}" : \
 '-j+[number of jobs to run in parallel]:JOBS:' \
 '--jobs=[number of jobs to run in parallel]:JOBS:' \
 '--warnings=[if value is deny, will deny warnings if value is warn, will emit warnings otherwise, use the default configured behaviour]:deny|warn:(deny warn default)' \
-'--error-format=[rustc error format]:FORMAT:' \
 '--color=[whether to use color in cargo and rustc output]:STYLE:(always never auto)' \
 '--rust-profile-generate=[generate PGO profile with rustc build]:PROFILE:_files' \
 '--rust-profile-use=[use PGO profile for rustc build]:PROFILE:_files' \
diff --git a/src/librustdoc/json/conversions.rs b/src/librustdoc/json/conversions.rs
index 6bdf3b5fe3876..b9df594dcca96 100644
--- a/src/librustdoc/json/conversions.rs
+++ b/src/librustdoc/json/conversions.rs
@@ -170,10 +170,13 @@ pub(crate) fn from_deprecation(deprecation: attrs::Deprecation) -> Deprecation {
     Deprecation { since, note: note.map(|s| s.to_string()) }
 }
 
-impl FromClean<clean::GenericArgs> for GenericArgs {
+impl FromClean<clean::GenericArgs> for Option<Box<GenericArgs>> {
     fn from_clean(args: &clean::GenericArgs, renderer: &JsonRenderer<'_>) -> Self {
         use clean::GenericArgs::*;
-        match args {
+        if args.is_empty() {
+            return None;
+        }
+        Some(Box::new(match args {
             AngleBracketed { args, constraints } => GenericArgs::AngleBracketed {
                 args: args.into_json(renderer),
                 constraints: constraints.into_json(renderer),
@@ -183,7 +186,7 @@ impl FromClean<clean::GenericArgs> for GenericArgs {
                 output: output.as_ref().map(|a| a.as_ref().into_json(renderer)),
             },
             ReturnTypeNotation => GenericArgs::ReturnTypeNotation,
-        }
+        }))
     }
 }
 
@@ -580,7 +583,20 @@ impl FromClean<clean::Path> for Path {
         Path {
             path: path.whole_name(),
             id: renderer.id_from_item_default(path.def_id().into()),
-            args: path.segments.last().map(|args| Box::new(args.args.into_json(renderer))),
+            args: {
+                if let Some((final_seg, rest_segs)) = path.segments.split_last() {
+                    // In general, `clean::Path` can hold things like
+                    // `std::vec::Vec::<u32>::new`, where generic args appear
+                    // in a middle segment. But for the places where `Path` is
+                    // used by rustdoc-json-types, generic args can only be
+                    // used in the final segment, e.g. `std::vec::Vec<u32>`. So
+                    // check that the non-final segments have no generic args.
+                    assert!(rest_segs.iter().all(|seg| seg.args.is_empty()));
+                    final_seg.args.into_json(renderer)
+                } else {
+                    None // no generics on any segments because there are no segments
+                }
+            },
         }
     }
 }
@@ -591,7 +607,7 @@ impl FromClean<clean::QPathData> for Type {
 
         Self::QualifiedPath {
             name: assoc.name.to_string(),
-            args: Box::new(assoc.args.into_json(renderer)),
+            args: assoc.args.into_json(renderer),
             self_type: Box::new(self_type.into_json(renderer)),
             trait_: trait_.as_ref().map(|trait_| trait_.into_json(renderer)),
         }
diff --git a/src/rustdoc-json-types/lib.rs b/src/rustdoc-json-types/lib.rs
index 1f93895ae0762..44bb14eeaf78f 100644
--- a/src/rustdoc-json-types/lib.rs
+++ b/src/rustdoc-json-types/lib.rs
@@ -37,8 +37,8 @@ pub type FxHashMap<K, V> = HashMap<K, V>; // re-export for use in src/librustdoc
 // will instead cause conflicts. See #94591 for more. (This paragraph and the "Latest feature" line
 // are deliberately not in a doc comment, because they need not be in public docs.)
 //
-// Latest feature: Pretty printing of inline attributes changed
-pub const FORMAT_VERSION: u32 = 48;
+// Latest feature: improve handling of generic args
+pub const FORMAT_VERSION: u32 = 49;
 
 /// The root of the emitted JSON blob.
 ///
@@ -277,8 +277,8 @@ pub struct PolyTrait {
 /// A set of generic arguments provided to a path segment, e.g.
 ///
 /// ```text
-/// std::option::Option::<u32>::None
-///                      ^^^^^
+/// std::option::Option<u32>
+///                    ^^^^^
 /// ```
 #[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
 #[serde(rename_all = "snake_case")]
@@ -331,7 +331,7 @@ pub enum GenericArg {
     Const(Constant),
     /// A generic argument that's explicitly set to be inferred.
     /// ```text
-    /// std::vec::Vec::<_>::new()
+    /// std::vec::Vec::<_>
     ///                 ^
     /// ```
     Infer,
@@ -362,7 +362,7 @@ pub struct AssocItemConstraint {
     /// The name of the associated type/constant.
     pub name: String,
     /// Arguments provided to the associated type/constant.
-    pub args: GenericArgs,
+    pub args: Option<Box<GenericArgs>>,
     /// The kind of bound applied to the associated type/constant.
     pub binding: AssocItemConstraintKind,
 }
@@ -1118,7 +1118,7 @@ pub enum Type {
         /// <core::slice::IterMut<'static, u32> as BetterIterator>::Item<'static>
         /// //                                                          ^^^^^^^^^
         /// ```
-        args: Box<GenericArgs>,
+        args: Option<Box<GenericArgs>>,
         /// The type with which this type is associated.
         ///
         /// ```ignore (incomplete expression)
diff --git a/src/rustdoc-json-types/tests.rs b/src/rustdoc-json-types/tests.rs
index b9363fcf1b714..c50eb61650126 100644
--- a/src/rustdoc-json-types/tests.rs
+++ b/src/rustdoc-json-types/tests.rs
@@ -38,3 +38,28 @@ fn test_union_info_roundtrip() {
     let decoded: ItemEnum = bincode::deserialize(&encoded).unwrap();
     assert_eq!(u, decoded);
 }
+
+// The memory used by a `Crate` can get large. These types are the ones that
+// contribute the most to its size.
+#[test]
+#[cfg(target_pointer_width = "64")]
+fn test_type_sizes() {
+    // tidy-alphabetical-start
+    assert_eq!(size_of::<AssocItemConstraint>(), 112);
+    assert_eq!(size_of::<Crate>(), 184);
+    assert_eq!(size_of::<ExternalCrate>(), 48);
+    assert_eq!(size_of::<FunctionPointer>(), 168);
+    assert_eq!(size_of::<GenericArg>(), 80);
+    assert_eq!(size_of::<GenericArgs>(), 104);
+    assert_eq!(size_of::<GenericBound>(), 72);
+    assert_eq!(size_of::<GenericParamDef>(), 136);
+    assert_eq!(size_of::<Impl>(), 304);
+    assert_eq!(size_of::<Item>(), 552);
+    assert_eq!(size_of::<ItemSummary>(), 32);
+    assert_eq!(size_of::<PolyTrait>(), 64);
+    assert_eq!(size_of::<PreciseCapturingArg>(), 32);
+    assert_eq!(size_of::<TargetFeature>(), 80);
+    assert_eq!(size_of::<Type>(), 80);
+    assert_eq!(size_of::<WherePredicate>(), 160);
+    // tidy-alphabetical-end
+}
diff --git a/src/tools/clippy/tests/ui/single_range_in_vec_init.rs b/src/tools/clippy/tests/ui/single_range_in_vec_init.rs
index 25884450b0842..0888019e101ce 100644
--- a/src/tools/clippy/tests/ui/single_range_in_vec_init.rs
+++ b/src/tools/clippy/tests/ui/single_range_in_vec_init.rs
@@ -2,7 +2,6 @@
 //@no-rustfix: overlapping suggestions
 #![allow(clippy::no_effect, clippy::unnecessary_operation, clippy::useless_vec, unused)]
 #![warn(clippy::single_range_in_vec_init)]
-#![feature(generic_arg_infer)]
 
 #[macro_use]
 extern crate proc_macros;
diff --git a/src/tools/clippy/tests/ui/single_range_in_vec_init.stderr b/src/tools/clippy/tests/ui/single_range_in_vec_init.stderr
index a99127a7606fb..b21338e38a3cb 100644
--- a/src/tools/clippy/tests/ui/single_range_in_vec_init.stderr
+++ b/src/tools/clippy/tests/ui/single_range_in_vec_init.stderr
@@ -1,5 +1,5 @@
 error: an array of `Range` that is only one element
-  --> tests/ui/single_range_in_vec_init.rs:26:5
+  --> tests/ui/single_range_in_vec_init.rs:25:5
    |
 LL |     [0..200];
    |     ^^^^^^^^
@@ -18,7 +18,7 @@ LL +     [0; 200];
    |
 
 error: a `Vec` of `Range` that is only one element
-  --> tests/ui/single_range_in_vec_init.rs:28:5
+  --> tests/ui/single_range_in_vec_init.rs:27:5
    |
 LL |     vec![0..200];
    |     ^^^^^^^^^^^^
@@ -35,7 +35,7 @@ LL +     vec![0; 200];
    |
 
 error: an array of `Range` that is only one element
-  --> tests/ui/single_range_in_vec_init.rs:30:5
+  --> tests/ui/single_range_in_vec_init.rs:29:5
    |
 LL |     [0u8..200];
    |     ^^^^^^^^^^
@@ -52,7 +52,7 @@ LL +     [0u8; 200];
    |
 
 error: an array of `Range` that is only one element
-  --> tests/ui/single_range_in_vec_init.rs:32:5
+  --> tests/ui/single_range_in_vec_init.rs:31:5
    |
 LL |     [0usize..200];
    |     ^^^^^^^^^^^^^
@@ -69,7 +69,7 @@ LL +     [0usize; 200];
    |
 
 error: an array of `Range` that is only one element
-  --> tests/ui/single_range_in_vec_init.rs:34:5
+  --> tests/ui/single_range_in_vec_init.rs:33:5
    |
 LL |     [0..200usize];
    |     ^^^^^^^^^^^^^
@@ -86,7 +86,7 @@ LL +     [0; 200usize];
    |
 
 error: a `Vec` of `Range` that is only one element
-  --> tests/ui/single_range_in_vec_init.rs:36:5
+  --> tests/ui/single_range_in_vec_init.rs:35:5
    |
 LL |     vec![0u8..200];
    |     ^^^^^^^^^^^^^^
@@ -103,7 +103,7 @@ LL +     vec![0u8; 200];
    |
 
 error: a `Vec` of `Range` that is only one element
-  --> tests/ui/single_range_in_vec_init.rs:38:5
+  --> tests/ui/single_range_in_vec_init.rs:37:5
    |
 LL |     vec![0usize..200];
    |     ^^^^^^^^^^^^^^^^^
@@ -120,7 +120,7 @@ LL +     vec![0usize; 200];
    |
 
 error: a `Vec` of `Range` that is only one element
-  --> tests/ui/single_range_in_vec_init.rs:40:5
+  --> tests/ui/single_range_in_vec_init.rs:39:5
    |
 LL |     vec![0..200usize];
    |     ^^^^^^^^^^^^^^^^^
@@ -137,7 +137,7 @@ LL +     vec![0; 200usize];
    |
 
 error: an array of `Range` that is only one element
-  --> tests/ui/single_range_in_vec_init.rs:43:5
+  --> tests/ui/single_range_in_vec_init.rs:42:5
    |
 LL |     [0..200isize];
    |     ^^^^^^^^^^^^^
@@ -149,7 +149,7 @@ LL +     (0..200isize).collect::<std::vec::Vec<isize>>();
    |
 
 error: a `Vec` of `Range` that is only one element
-  --> tests/ui/single_range_in_vec_init.rs:45:5
+  --> tests/ui/single_range_in_vec_init.rs:44:5
    |
 LL |     vec![0..200isize];
    |     ^^^^^^^^^^^^^^^^^
diff --git a/src/tools/compiletest/src/runtest.rs b/src/tools/compiletest/src/runtest.rs
index 75f24adb70fa5..e9b8b6bda3fac 100644
--- a/src/tools/compiletest/src/runtest.rs
+++ b/src/tools/compiletest/src/runtest.rs
@@ -2368,7 +2368,8 @@ impl<'test> TestCx<'test> {
         // Real paths into the libstd/libcore
         let rust_src_dir = &self.config.sysroot_base.join("lib/rustlib/src/rust");
         rust_src_dir.try_exists().expect(&*format!("{} should exists", rust_src_dir));
-        let rust_src_dir = rust_src_dir.read_link_utf8().unwrap_or(rust_src_dir.to_path_buf());
+        let rust_src_dir =
+            rust_src_dir.read_link_utf8().unwrap_or_else(|_| rust_src_dir.to_path_buf());
         normalize_path(&rust_src_dir.join("library"), "$SRC_DIR_REAL");
 
         // eg.
diff --git a/src/tools/compiletest/src/runtest/coverage.rs b/src/tools/compiletest/src/runtest/coverage.rs
index 41cfeaee35ffb..38f0e95647490 100644
--- a/src/tools/compiletest/src/runtest/coverage.rs
+++ b/src/tools/compiletest/src/runtest/coverage.rs
@@ -357,9 +357,9 @@ impl<'test> TestCx<'test> {
                 // Add this line to the current subview.
                 subviews
                     .last_mut()
-                    .ok_or(format!(
-                        "unexpected subview line outside of a subview on line {line_num}"
-                    ))?
+                    .ok_or_else(|| {
+                        format!("unexpected subview line outside of a subview on line {line_num}")
+                    })?
                     .push(line);
             } else {
                 // This line is not part of a subview, so sort and print any
diff --git a/src/tools/jsondoclint/src/validator.rs b/src/tools/jsondoclint/src/validator.rs
index 8c9e4c8bb3a60..0a4051fcbe8cd 100644
--- a/src/tools/jsondoclint/src/validator.rs
+++ b/src/tools/jsondoclint/src/validator.rs
@@ -271,7 +271,7 @@ impl<'a> Validator<'a> {
             Type::RawPointer { is_mutable: _, type_ } => self.check_type(&**type_),
             Type::BorrowedRef { lifetime: _, is_mutable: _, type_ } => self.check_type(&**type_),
             Type::QualifiedPath { name: _, args, self_type, trait_ } => {
-                self.check_generic_args(&**args);
+                self.check_opt_generic_args(&args);
                 self.check_type(&**self_type);
                 if let Some(trait_) = trait_ {
                     self.check_path(trait_, PathKind::Trait);
@@ -309,13 +309,12 @@ impl<'a> Validator<'a> {
             self.fail(&x.id, ErrorKind::Custom(format!("No entry in '$.paths' for {x:?}")));
         }
 
-        if let Some(args) = &x.args {
-            self.check_generic_args(&**args);
-        }
+        self.check_opt_generic_args(&x.args);
     }
 
-    fn check_generic_args(&mut self, x: &'a GenericArgs) {
-        match x {
+    fn check_opt_generic_args(&mut self, x: &'a Option<Box<GenericArgs>>) {
+        let Some(x) = x else { return };
+        match &**x {
             GenericArgs::AngleBracketed { args, constraints } => {
                 args.iter().for_each(|arg| self.check_generic_arg(arg));
                 constraints.iter().for_each(|bind| self.check_assoc_item_constraint(bind));
@@ -355,7 +354,7 @@ impl<'a> Validator<'a> {
     }
 
     fn check_assoc_item_constraint(&mut self, bind: &'a AssocItemConstraint) {
-        self.check_generic_args(&bind.args);
+        self.check_opt_generic_args(&bind.args);
         match &bind.binding {
             AssocItemConstraintKind::Equality(term) => self.check_term(term),
             AssocItemConstraintKind::Constraint(bounds) => {
diff --git a/tests/codegen/frame-pointer-cli-control.rs b/tests/codegen/frame-pointer-cli-control.rs
new file mode 100644
index 0000000000000..a65dd132763de
--- /dev/null
+++ b/tests/codegen/frame-pointer-cli-control.rs
@@ -0,0 +1,61 @@
+//@ add-core-stubs
+//@ compile-flags: --crate-type=rlib -Copt-level=0
+//@ revisions: force-on aarch64-apple aarch64-apple-on aarch64-apple-off
+//@ [force-on] compile-flags: -Cforce-frame-pointers=on
+//@ [aarch64-apple] needs-llvm-components: aarch64
+//@ [aarch64-apple] compile-flags: --target=aarch64-apple-darwin
+//@ [aarch64-apple-on] needs-llvm-components: aarch64
+//@ [aarch64-apple-on] compile-flags: --target=aarch64-apple-darwin -Cforce-frame-pointers=on
+//@ [aarch64-apple-off] needs-llvm-components: aarch64
+//@ [aarch64-apple-off] compile-flags: --target=aarch64-apple-darwin -Cforce-frame-pointers=off
+/*!
+
+Tests the extent to which frame pointers can be controlled by the CLI.
+The behavior of our frame pointer options, at present, is an irreversible ratchet, where
+a "weaker" option that allows omitting frame pointers may be overridden by the target demanding
+that all code (or all non-leaf code, more often) must be compiled with frame pointers.
+This was discussed on 2025-05-22 in the T-compiler meeting and accepted as an intentional change,
+ratifying the prior decisions by compiler contributors and reviewers as correct,
+though it was also acknowledged that the flag allows somewhat confusing inputs.
+
+We find aarch64-apple-darwin useful because of its icy-clear policy regarding frame pointers,
+e.g. <https://developer.apple.com/documentation/xcode/writing-arm64-code-for-apple-platforms> says:
+
+* The frame pointer register (x29) must always address a valid frame record. Some functions —
+  such as leaf functions or tail calls — may opt not to create an entry in this list.
+  As a result, stack traces are always meaningful, even without debug information.
+
+Many Rust fn, if externally visible, may be expected to follow target ABI by tools or asm code!
+This can make it a problem to generate ABI-incorrect code, which may mean "with frame pointers".
+For this and other reasons, `-Cforce-frame-pointers=off` cannot override the target definition.
+This can cause some confusion because it is "reverse polarity" relative to C compilers, which have
+commands like `-fomit-frame-pointer`, `-fomit-leaf-frame-pointer`, or `-fno-omit-frame-pointer`!
+
+Specific cases where platforms or tools rely on frame pointers for sound or correct unwinding:
+- illumos: <https://smartos.org/bugview/OS-7515>
+- aarch64-windows: <https://github.com/rust-lang/rust/issues/123686>
+- aarch64-linux: <https://github.com/rust-lang/rust/issues/123733>
+- dtrace (freebsd and openbsd): <https://github.com/rust-lang/rust/issues/97723>
+- openbsd: <https://github.com/rust-lang/rust/issues/43575>
+- i686-msvc <https://github.com/rust-lang/backtrace-rs/pull/584#issuecomment-1966177530>
+- i686-mingw: <https://github.com/rust-lang/rust/commit/3f1d3948d6d434b34dd47f132c126a6cb6b8a4ab>
+*/
+#![feature(no_core, lang_items)]
+#![no_core]
+
+extern crate minicore;
+
+// CHECK: i32 @peach{{.*}}[[PEACH_ATTRS:\#[0-9]+]] {
+#[no_mangle]
+pub fn peach(x: u32) -> u32 {
+    x
+}
+
+// CHECK: attributes [[PEACH_ATTRS]] = {
+// force-on-SAME: {{.*}}"frame-pointer"="all"
+// aarch64-apple-SAME: {{.*}}"frame-pointer"="non-leaf"
+// aarch64-apple-on-SAME: {{.*}}"frame-pointer"="all"
+//
+// yes, we are testing this doesn't do anything:
+// aarch64-apple-off-SAME: {{.*}}"frame-pointer"="non-leaf"
+// CHECK-SAME: }
diff --git a/tests/crashes/111419.rs b/tests/crashes/111419.rs
index 3a1a13df1985a..36f15e1d0a26e 100644
--- a/tests/crashes/111419.rs
+++ b/tests/crashes/111419.rs
@@ -1,6 +1,6 @@
 //@ known-bug: #111419
 #![allow(incomplete_features)]
-#![feature(generic_const_exprs, generic_arg_infer)]
+#![feature(generic_const_exprs)]
 
 pub trait Example<const X: usize, const Y: usize, const Z: usize = { X + Y }>
 where
diff --git a/tests/rustdoc-json/generic-args.rs b/tests/rustdoc-json/generic-args.rs
new file mode 100644
index 0000000000000..0f588820da75d
--- /dev/null
+++ b/tests/rustdoc-json/generic-args.rs
@@ -0,0 +1,20 @@
+pub struct MyStruct(u32);
+
+pub trait MyTrait {
+    type MyType;
+    fn my_fn(&self);
+}
+
+impl MyTrait for MyStruct {
+    type MyType = u32;
+    fn my_fn(&self) {}
+}
+
+//@ is "$.index[?(@.name=='my_fn1')].inner.function.sig.inputs[0][1].qualified_path.args" null
+//@ is "$.index[?(@.name=='my_fn1')].inner.function.sig.inputs[0][1].qualified_path.self_type.resolved_path.args" null
+pub fn my_fn1(_: <MyStruct as MyTrait>::MyType) {}
+
+//@ is "$.index[?(@.name=='my_fn2')].inner.function.sig.inputs[0][1].dyn_trait.traits[0].trait.args.angle_bracketed.constraints[0].args" null
+pub fn my_fn2(_: IntoIterator<Item = MyStruct, IntoIter = impl Clone>) {}
+
+fn main() {}
diff --git a/tests/ui/array-slice-vec/suggest-array-length.fixed b/tests/ui/array-slice-vec/suggest-array-length.fixed
index 2eacc2517d310..ae1c6583c238b 100644
--- a/tests/ui/array-slice-vec/suggest-array-length.fixed
+++ b/tests/ui/array-slice-vec/suggest-array-length.fixed
@@ -10,14 +10,9 @@ fn main() {
     //~^ ERROR the placeholder `_` is not allowed within types on item signatures for static variables
     static REF_STATIK: &[u8; 1] = &[1];
     //~^ ERROR the placeholder `_` is not allowed within types on item signatures for static variables
-    let foo: [i32; 3] = [1, 2, 3];
-    //~^ ERROR using `_` for array lengths is unstable
-    let bar: [i32; 3] = [0; 3];
-    //~^ ERROR using `_` for array lengths is unstable
-    let ref_foo: &[i32; 3] = &[1, 2, 3];
-    //~^ ERROR using `_` for array lengths is unstable
-    let ref_bar: &[i32; 3] = &[0; 3];
-    //~^ ERROR using `_` for array lengths is unstable
-    let multiple_ref_foo: &&[i32; 3] = &&[1, 2, 3];
-    //~^ ERROR using `_` for array lengths is unstable
+    let foo: [i32; _] = [1, 2, 3];
+    let bar: [i32; _] = [0; 3];
+    let ref_foo: &[i32; _] = &[1, 2, 3];
+    let ref_bar: &[i32; _] = &[0; 3];
+    let multiple_ref_foo: &&[i32; _] = &&[1, 2, 3];
 }
diff --git a/tests/ui/array-slice-vec/suggest-array-length.rs b/tests/ui/array-slice-vec/suggest-array-length.rs
index fb4424cfed99d..e53118014b2a4 100644
--- a/tests/ui/array-slice-vec/suggest-array-length.rs
+++ b/tests/ui/array-slice-vec/suggest-array-length.rs
@@ -11,13 +11,8 @@ fn main() {
     static REF_STATIK: &[u8; _] = &[1];
     //~^ ERROR the placeholder `_` is not allowed within types on item signatures for static variables
     let foo: [i32; _] = [1, 2, 3];
-    //~^ ERROR using `_` for array lengths is unstable
     let bar: [i32; _] = [0; 3];
-    //~^ ERROR using `_` for array lengths is unstable
     let ref_foo: &[i32; _] = &[1, 2, 3];
-    //~^ ERROR using `_` for array lengths is unstable
     let ref_bar: &[i32; _] = &[0; 3];
-    //~^ ERROR using `_` for array lengths is unstable
     let multiple_ref_foo: &&[i32; _] = &&[1, 2, 3];
-    //~^ ERROR using `_` for array lengths is unstable
 }
diff --git a/tests/ui/array-slice-vec/suggest-array-length.stderr b/tests/ui/array-slice-vec/suggest-array-length.stderr
index 14d10832e3608..e498f2ca4f580 100644
--- a/tests/ui/array-slice-vec/suggest-array-length.stderr
+++ b/tests/ui/array-slice-vec/suggest-array-length.stderr
@@ -46,57 +46,6 @@ LL -     static REF_STATIK: &[u8; _] = &[1];
 LL +     static REF_STATIK: &[u8; 1] = &[1];
    |
 
-error[E0658]: using `_` for array lengths is unstable
-  --> $DIR/suggest-array-length.rs:13:20
-   |
-LL |     let foo: [i32; _] = [1, 2, 3];
-   |                    ^ help: consider specifying the array length: `3`
-   |
-   = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
-   = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: using `_` for array lengths is unstable
-  --> $DIR/suggest-array-length.rs:15:20
-   |
-LL |     let bar: [i32; _] = [0; 3];
-   |                    ^ help: consider specifying the array length: `3`
-   |
-   = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
-   = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: using `_` for array lengths is unstable
-  --> $DIR/suggest-array-length.rs:17:25
-   |
-LL |     let ref_foo: &[i32; _] = &[1, 2, 3];
-   |                         ^ help: consider specifying the array length: `3`
-   |
-   = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
-   = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: using `_` for array lengths is unstable
-  --> $DIR/suggest-array-length.rs:19:25
-   |
-LL |     let ref_bar: &[i32; _] = &[0; 3];
-   |                         ^ help: consider specifying the array length: `3`
-   |
-   = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
-   = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: using `_` for array lengths is unstable
-  --> $DIR/suggest-array-length.rs:21:35
-   |
-LL |     let multiple_ref_foo: &&[i32; _] = &&[1, 2, 3];
-   |                                   ^ help: consider specifying the array length: `3`
-   |
-   = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
-   = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error: aborting due to 9 previous errors
+error: aborting due to 4 previous errors
 
-Some errors have detailed explanations: E0121, E0658.
-For more information about an error, try `rustc --explain E0121`.
+For more information about this error, try `rustc --explain E0121`.
diff --git a/tests/ui/async-await/async-drop/async-without-sync.rs b/tests/ui/async-await/async-drop/async-without-sync.rs
new file mode 100644
index 0000000000000..8a748636cc783
--- /dev/null
+++ b/tests/ui/async-await/async-drop/async-without-sync.rs
@@ -0,0 +1,19 @@
+//@ edition: 2024
+#![feature(async_drop)]
+#![allow(incomplete_features)]
+#![crate_type = "lib"]
+
+use std::future::AsyncDrop;
+use std::pin::Pin;
+
+async fn foo() {
+    let _st = St;
+}
+
+struct St;
+
+impl AsyncDrop for St { //~ ERROR: `AsyncDrop` impl without `Drop` impl
+    async fn drop(self: Pin<&mut Self>) {
+        println!("123");
+    }
+}
diff --git a/tests/ui/async-await/async-drop/async-without-sync.stderr b/tests/ui/async-await/async-drop/async-without-sync.stderr
new file mode 100644
index 0000000000000..0eaca322dc034
--- /dev/null
+++ b/tests/ui/async-await/async-drop/async-without-sync.stderr
@@ -0,0 +1,10 @@
+error: `AsyncDrop` impl without `Drop` impl
+  --> $DIR/async-without-sync.rs:15:1
+   |
+LL | impl AsyncDrop for St {
+   | ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: type implementing `AsyncDrop` trait must also implement `Drop` trait to be used in sync context and unwinds
+
+error: aborting due to 1 previous error
+
diff --git a/tests/ui/async-await/issues/issue-95307.rs b/tests/ui/async-await/issues/issue-95307.rs
index 27903a667fb5c..83df65612b486 100644
--- a/tests/ui/async-await/issues/issue-95307.rs
+++ b/tests/ui/async-await/issues/issue-95307.rs
@@ -6,7 +6,6 @@
 pub trait C {
     async fn new() -> [u8; _];
     //~^ ERROR: the placeholder `_` is not allowed within types on item signatures for functions
-    //~| ERROR using `_` for array lengths is unstable
 }
 
 fn main() {}
diff --git a/tests/ui/async-await/issues/issue-95307.stderr b/tests/ui/async-await/issues/issue-95307.stderr
index 90100f391637a..c670686f7c9d5 100644
--- a/tests/ui/async-await/issues/issue-95307.stderr
+++ b/tests/ui/async-await/issues/issue-95307.stderr
@@ -4,17 +4,6 @@ error[E0121]: the placeholder `_` is not allowed within types on item signatures
 LL |     async fn new() -> [u8; _];
    |                            ^ not allowed in type signatures
 
-error[E0658]: using `_` for array lengths is unstable
-  --> $DIR/issue-95307.rs:7:28
-   |
-LL |     async fn new() -> [u8; _];
-   |                            ^
-   |
-   = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
-   = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error: aborting due to 2 previous errors
+error: aborting due to 1 previous error
 
-Some errors have detailed explanations: E0121, E0658.
-For more information about an error, try `rustc --explain E0121`.
+For more information about this error, try `rustc --explain E0121`.
diff --git a/tests/ui/closures/binder/forbid_ambig_const_infers.rs b/tests/ui/closures/binder/forbid_ambig_const_infers.rs
index e9d783711ee3e..eb258e0ed9f75 100644
--- a/tests/ui/closures/binder/forbid_ambig_const_infers.rs
+++ b/tests/ui/closures/binder/forbid_ambig_const_infers.rs
@@ -1,4 +1,4 @@
-#![feature(generic_arg_infer, closure_lifetime_binder)]
+#![feature(closure_lifetime_binder)]
 
 struct Foo<const N: usize>([u32; N]);
 
diff --git a/tests/ui/closures/binder/forbid_ambig_type_infers.rs b/tests/ui/closures/binder/forbid_ambig_type_infers.rs
index 4e717ef3a179d..ca44a5db96d0f 100644
--- a/tests/ui/closures/binder/forbid_ambig_type_infers.rs
+++ b/tests/ui/closures/binder/forbid_ambig_type_infers.rs
@@ -1,4 +1,4 @@
-#![feature(generic_arg_infer, closure_lifetime_binder)]
+#![feature(closure_lifetime_binder)]
 
 struct Foo<T>(T);
 
diff --git a/tests/ui/closures/binder/forbid_const_infer.rs b/tests/ui/closures/binder/forbid_const_infer.rs
index f5b8bf188dfee..8c8f0456f503e 100644
--- a/tests/ui/closures/binder/forbid_const_infer.rs
+++ b/tests/ui/closures/binder/forbid_const_infer.rs
@@ -1,4 +1,4 @@
-#![feature(generic_arg_infer, closure_lifetime_binder)]
+#![feature(closure_lifetime_binder)]
 
 fn main() {
     let c = for<'a> |b: &'a [u32; _]| -> u32 { b[0] };
diff --git a/tests/ui/const-generics/associated_const_equality/equality_bound_with_infer.rs b/tests/ui/const-generics/associated_const_equality/equality_bound_with_infer.rs
index f45b7c3268b17..dc42e00c2e834 100644
--- a/tests/ui/const-generics/associated_const_equality/equality_bound_with_infer.rs
+++ b/tests/ui/const-generics/associated_const_equality/equality_bound_with_infer.rs
@@ -1,4 +1,4 @@
-#![feature(generic_arg_infer, associated_const_equality, generic_const_items)]
+#![feature(associated_const_equality, generic_const_items)]
 #![expect(incomplete_features)]
 
 // Regression test for #133066 where we would try to evaluate `<() as Foo>::ASSOC<_>` even
diff --git a/tests/ui/const-generics/generic_arg_infer/array-repeat-expr-lib.rs b/tests/ui/const-generics/generic_arg_infer/array-repeat-expr-lib.rs
index c1f725db126a0..c3a6767011483 100644
--- a/tests/ui/const-generics/generic_arg_infer/array-repeat-expr-lib.rs
+++ b/tests/ui/const-generics/generic_arg_infer/array-repeat-expr-lib.rs
@@ -1,6 +1,5 @@
 //@ check-pass
 
-#![feature(generic_arg_infer)]
 #![crate_type = "lib"]
 
 // Test that encoding the hallucinated `DefId` for the `_` const argument doesn't
diff --git a/tests/ui/const-generics/generic_arg_infer/array-repeat-expr.rs b/tests/ui/const-generics/generic_arg_infer/array-repeat-expr.rs
index 34091badfa7f1..fff9f2cc94d84 100644
--- a/tests/ui/const-generics/generic_arg_infer/array-repeat-expr.rs
+++ b/tests/ui/const-generics/generic_arg_infer/array-repeat-expr.rs
@@ -1,7 +1,6 @@
 //@ run-pass
 
 // To avoid having to `or` gate `_` as an expr.
-#![feature(generic_arg_infer)]
 
 fn foo() -> [u8; 3] {
     let x: [u8; _] = [0; _];
diff --git a/tests/ui/const-generics/generic_arg_infer/dont-use-defaults.rs b/tests/ui/const-generics/generic_arg_infer/dont-use-defaults.rs
index 613ea9da99da3..d4a1468c04965 100644
--- a/tests/ui/const-generics/generic_arg_infer/dont-use-defaults.rs
+++ b/tests/ui/const-generics/generic_arg_infer/dont-use-defaults.rs
@@ -1,7 +1,4 @@
 //@ run-pass
-#![feature(generic_arg_infer)]
-
-// test that we dont use defaults to aide in type inference
 
 struct Foo<const N: usize = 2>;
 impl<const N: usize> Foo<N> {
diff --git a/tests/ui/const-generics/generic_arg_infer/in-signature.rs b/tests/ui/const-generics/generic_arg_infer/in-signature.rs
index cd852a269435e..cd0235bf45aa8 100644
--- a/tests/ui/const-generics/generic_arg_infer/in-signature.rs
+++ b/tests/ui/const-generics/generic_arg_infer/in-signature.rs
@@ -1,5 +1,4 @@
 #![crate_type = "rlib"]
-#![feature(generic_arg_infer)]
 
 struct Foo<const N: usize>;
 struct Bar<T, const N: usize>(T);
diff --git a/tests/ui/const-generics/generic_arg_infer/in-signature.stderr b/tests/ui/const-generics/generic_arg_infer/in-signature.stderr
index 12d84268f955c..f964fc8d2f2c5 100644
--- a/tests/ui/const-generics/generic_arg_infer/in-signature.stderr
+++ b/tests/ui/const-generics/generic_arg_infer/in-signature.stderr
@@ -1,5 +1,5 @@
 error[E0121]: the placeholder `_` is not allowed within types on item signatures for return types
-  --> $DIR/in-signature.rs:7:21
+  --> $DIR/in-signature.rs:6:21
    |
 LL | fn arr_fn() -> [u8; _] {
    |                -----^-
@@ -8,7 +8,7 @@ LL | fn arr_fn() -> [u8; _] {
    |                help: replace with the correct return type: `[u8; 3]`
 
 error[E0121]: the placeholder `_` is not allowed within types on item signatures for return types
-  --> $DIR/in-signature.rs:12:24
+  --> $DIR/in-signature.rs:11:24
    |
 LL | fn ty_fn() -> Bar<i32, _> {
    |               ---------^-
@@ -17,7 +17,7 @@ LL | fn ty_fn() -> Bar<i32, _> {
    |               help: replace with the correct return type: `Bar<i32, 3>`
 
 error[E0121]: the placeholder `_` is not allowed within types on item signatures for return types
-  --> $DIR/in-signature.rs:17:25
+  --> $DIR/in-signature.rs:16:25
    |
 LL | fn ty_fn_mixed() -> Bar<_, _> {
    |                     ----^--^-
@@ -27,7 +27,7 @@ LL | fn ty_fn_mixed() -> Bar<_, _> {
    |                     help: replace with the correct return type: `Bar<i32, 3>`
 
 error[E0121]: the placeholder `_` is not allowed within types on item signatures for constants
-  --> $DIR/in-signature.rs:22:20
+  --> $DIR/in-signature.rs:21:20
    |
 LL | const ARR_CT: [u8; _] = [0; 3];
    |                    ^ not allowed in type signatures
@@ -39,7 +39,7 @@ LL + const ARR_CT: [u8; 3] = [0; 3];
    |
 
 error[E0121]: the placeholder `_` is not allowed within types on item signatures for static variables
-  --> $DIR/in-signature.rs:24:25
+  --> $DIR/in-signature.rs:23:25
    |
 LL | static ARR_STATIC: [u8; _] = [0; 3];
    |                         ^ not allowed in type signatures
@@ -51,7 +51,7 @@ LL + static ARR_STATIC: [u8; 3] = [0; 3];
    |
 
 error[E0121]: the placeholder `_` is not allowed within types on item signatures for constants
-  --> $DIR/in-signature.rs:26:23
+  --> $DIR/in-signature.rs:25:23
    |
 LL | const TY_CT: Bar<i32, _> = Bar::<i32, 3>(0);
    |                       ^ not allowed in type signatures
@@ -63,7 +63,7 @@ LL + const TY_CT: Bar<i32, 3> = Bar::<i32, 3>(0);
    |
 
 error[E0121]: the placeholder `_` is not allowed within types on item signatures for static variables
-  --> $DIR/in-signature.rs:28:28
+  --> $DIR/in-signature.rs:27:28
    |
 LL | static TY_STATIC: Bar<i32, _> = Bar::<i32, 3>(0);
    |                            ^ not allowed in type signatures
@@ -75,7 +75,7 @@ LL + static TY_STATIC: Bar<i32, 3> = Bar::<i32, 3>(0);
    |
 
 error[E0121]: the placeholder `_` is not allowed within types on item signatures for constants
-  --> $DIR/in-signature.rs:30:24
+  --> $DIR/in-signature.rs:29:24
    |
 LL | const TY_CT_MIXED: Bar<_, _> = Bar::<i32, 3>(0);
    |                        ^  ^ not allowed in type signatures
@@ -89,7 +89,7 @@ LL + const TY_CT_MIXED: Bar<i32, 3> = Bar::<i32, 3>(0);
    |
 
 error[E0121]: the placeholder `_` is not allowed within types on item signatures for static variables
-  --> $DIR/in-signature.rs:32:29
+  --> $DIR/in-signature.rs:31:29
    |
 LL | static TY_STATIC_MIXED: Bar<_, _> = Bar::<i32, 3>(0);
    |                             ^  ^ not allowed in type signatures
@@ -103,19 +103,19 @@ LL + static TY_STATIC_MIXED: Bar<i32, 3> = Bar::<i32, 3>(0);
    |
 
 error[E0121]: the placeholder `_` is not allowed within types on item signatures for associated types
-  --> $DIR/in-signature.rs:51:23
+  --> $DIR/in-signature.rs:50:23
    |
 LL |     type Assoc = [u8; _];
    |                       ^ not allowed in type signatures
 
 error[E0121]: the placeholder `_` is not allowed within types on item signatures for associated types
-  --> $DIR/in-signature.rs:55:27
+  --> $DIR/in-signature.rs:54:27
    |
 LL |     type Assoc = Bar<i32, _>;
    |                           ^ not allowed in type signatures
 
 error[E0121]: the placeholder `_` is not allowed within types on item signatures for associated types
-  --> $DIR/in-signature.rs:59:22
+  --> $DIR/in-signature.rs:58:22
    |
 LL |     type Assoc = Bar<_, _>;
    |                      ^  ^ not allowed in type signatures
@@ -123,19 +123,19 @@ LL |     type Assoc = Bar<_, _>;
    |                      not allowed in type signatures
 
 error[E0121]: the placeholder `_` is not allowed within types on item signatures for associated constants
-  --> $DIR/in-signature.rs:35:21
+  --> $DIR/in-signature.rs:34:21
    |
 LL |     const ARR: [u8; _];
    |                     ^ not allowed in type signatures
 
 error[E0121]: the placeholder `_` is not allowed within types on item signatures for associated constants
-  --> $DIR/in-signature.rs:39:25
+  --> $DIR/in-signature.rs:38:25
    |
 LL |     const ARR: Bar<i32, _>;
    |                         ^ not allowed in type signatures
 
 error[E0121]: the placeholder `_` is not allowed within types on item signatures for associated constants
-  --> $DIR/in-signature.rs:43:20
+  --> $DIR/in-signature.rs:42:20
    |
 LL |     const ARR: Bar<_, _>;
    |                    ^  ^ not allowed in type signatures
diff --git a/tests/ui/const-generics/generic_arg_infer/infer-arg-test.rs b/tests/ui/const-generics/generic_arg_infer/infer-arg-test.rs
index c254b4ee09d2e..dcdcd250ea926 100644
--- a/tests/ui/const-generics/generic_arg_infer/infer-arg-test.rs
+++ b/tests/ui/const-generics/generic_arg_infer/infer-arg-test.rs
@@ -1,5 +1,3 @@
-#![feature(generic_arg_infer)]
-
 struct All<'a, T, const N: usize> {
   v: &'a T,
 }
diff --git a/tests/ui/const-generics/generic_arg_infer/infer-arg-test.stderr b/tests/ui/const-generics/generic_arg_infer/infer-arg-test.stderr
index a9c57dbf26a0e..88645f839fc57 100644
--- a/tests/ui/const-generics/generic_arg_infer/infer-arg-test.stderr
+++ b/tests/ui/const-generics/generic_arg_infer/infer-arg-test.stderr
@@ -1,17 +1,17 @@
 error: expected identifier, found reserved identifier `_`
-  --> $DIR/infer-arg-test.rs:7:17
+  --> $DIR/infer-arg-test.rs:5:17
    |
 LL | struct BadInfer<_>;
    |                 ^ expected identifier, found reserved identifier
 
 error: expected identifier, found reserved identifier `_`
-  --> $DIR/infer-arg-test.rs:13:17
+  --> $DIR/infer-arg-test.rs:11:17
    |
 LL | fn bad_infer_fn<_>() {}
    |                 ^ expected identifier, found reserved identifier
 
 error[E0392]: type parameter `_` is never used
-  --> $DIR/infer-arg-test.rs:7:17
+  --> $DIR/infer-arg-test.rs:5:17
    |
 LL | struct BadInfer<_>;
    |                 ^ unused type parameter
@@ -20,7 +20,7 @@ LL | struct BadInfer<_>;
    = help: if you intended `_` to be a const parameter, use `const _: /* Type */` instead
 
 error[E0107]: struct takes 2 generic arguments but 3 generic arguments were supplied
-  --> $DIR/infer-arg-test.rs:18:10
+  --> $DIR/infer-arg-test.rs:16:10
    |
 LL |   let a: All<_, _, _>;
    |          ^^^     --- help: remove the unnecessary generic argument
@@ -28,7 +28,7 @@ LL |   let a: All<_, _, _>;
    |          expected 2 generic arguments
    |
 note: struct defined here, with 2 generic parameters: `T`, `N`
-  --> $DIR/infer-arg-test.rs:3:8
+  --> $DIR/infer-arg-test.rs:1:8
    |
 LL | struct All<'a, T, const N: usize> {
    |        ^^^     -  --------------
diff --git a/tests/ui/const-generics/generic_arg_infer/infer_arg_and_const_arg.rs b/tests/ui/const-generics/generic_arg_infer/infer_arg_and_const_arg.rs
index 35b3fe4f4359b..e82250444d93f 100644
--- a/tests/ui/const-generics/generic_arg_infer/infer_arg_and_const_arg.rs
+++ b/tests/ui/const-generics/generic_arg_infer/infer_arg_and_const_arg.rs
@@ -1,5 +1,4 @@
 //@ check-pass
-#![feature(generic_arg_infer)]
 
 struct Foo<const N: bool, const M: u8>;
 struct Bar<const N: u8, const M: u32>;
diff --git a/tests/ui/const-generics/generic_arg_infer/issue-91614.rs b/tests/ui/const-generics/generic_arg_infer/issue-91614.rs
index a386b1e5c2bf5..4a3d85499da81 100644
--- a/tests/ui/const-generics/generic_arg_infer/issue-91614.rs
+++ b/tests/ui/const-generics/generic_arg_infer/issue-91614.rs
@@ -1,5 +1,4 @@
 #![feature(portable_simd)]
-#![feature(generic_arg_infer)]
 use std::simd::Mask;
 
 fn main() {
diff --git a/tests/ui/const-generics/generic_arg_infer/issue-91614.stderr b/tests/ui/const-generics/generic_arg_infer/issue-91614.stderr
index b07e1f29d0d90..164bcc7111ca6 100644
--- a/tests/ui/const-generics/generic_arg_infer/issue-91614.stderr
+++ b/tests/ui/const-generics/generic_arg_infer/issue-91614.stderr
@@ -1,5 +1,5 @@
 error[E0284]: type annotations needed for `Mask<_, _>`
-  --> $DIR/issue-91614.rs:6:9
+  --> $DIR/issue-91614.rs:5:9
    |
 LL |     let y = Mask::<_, _>::splat(false);
    |         ^   ------------ type must be known at this point
@@ -12,7 +12,7 @@ LL |     let y: Mask<_, N> = Mask::<_, _>::splat(false);
    |          ++++++++++++
 
 error[E0284]: type annotations needed for `Mask<_, _>`
-  --> $DIR/issue-91614.rs:6:9
+  --> $DIR/issue-91614.rs:5:9
    |
 LL |     let y = Mask::<_, _>::splat(false);
    |         ^   -------------------------- type must be known at this point
diff --git a/tests/ui/const-generics/generic_arg_infer/parend_infer.nogate.stderr b/tests/ui/const-generics/generic_arg_infer/parend_infer.nogate.stderr
deleted file mode 100644
index d0a5da9676df4..0000000000000
--- a/tests/ui/const-generics/generic_arg_infer/parend_infer.nogate.stderr
+++ /dev/null
@@ -1,53 +0,0 @@
-error[E0658]: const arguments cannot yet be inferred with `_`
-  --> $DIR/parend_infer.rs:24:16
-   |
-LL |     let c: Foo<_> = Foo::<1>;
-   |                ^
-   |
-   = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
-   = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: const arguments cannot yet be inferred with `_`
-  --> $DIR/parend_infer.rs:26:16
-   |
-LL |     let c: Foo<(_)> = Foo::<1>;
-   |                ^^^
-   |
-   = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
-   = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: const arguments cannot yet be inferred with `_`
-  --> $DIR/parend_infer.rs:28:16
-   |
-LL |     let c: Foo<(((_)))> = Foo::<1>;
-   |                ^^^^^^^
-   |
-   = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
-   = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: using `_` for array lengths is unstable
-  --> $DIR/parend_infer.rs:17:17
-   |
-LL |     let b: [u8; (_)] = [1; (((((_)))))];
-   |                 ^^^
-   |
-   = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
-   = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: using `_` for array lengths is unstable
-  --> $DIR/parend_infer.rs:17:28
-   |
-LL |     let b: [u8; (_)] = [1; (((((_)))))];
-   |                            ^^^^^^^^^^^
-   |
-   = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
-   = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error: aborting due to 5 previous errors
-
-For more information about this error, try `rustc --explain E0658`.
diff --git a/tests/ui/const-generics/generic_arg_infer/parend_infer.rs b/tests/ui/const-generics/generic_arg_infer/parend_infer.rs
index 3dc27a702de40..9d7df8016cb1e 100644
--- a/tests/ui/const-generics/generic_arg_infer/parend_infer.rs
+++ b/tests/ui/const-generics/generic_arg_infer/parend_infer.rs
@@ -1,6 +1,4 @@
-//@[gate] check-pass
-//@ revisions: gate nogate
-#![cfg_attr(gate, feature(generic_arg_infer))]
+//@ check-pass
 
 struct Foo<const N: usize>;
 
@@ -15,16 +13,11 @@ fn main() {
     // AST Exprs similarly preserve parens for pretty printing reasons.
     #[rustfmt::skip]
     let b: [u8; (_)] = [1; (((((_)))))];
-    //[nogate]~^ error: using `_` for array lengths is unstable
-    //[nogate]~| error: using `_` for array lengths is unstable
     let b: [u8; 2] = b;
 
     // This is the same case as AST types as the parser doesn't distinguish between const
     // and type args when they share syntax
     let c: Foo<_> = Foo::<1>;
-    //[nogate]~^ error: const arguments cannot yet be inferred with `_`
     let c: Foo<(_)> = Foo::<1>;
-    //[nogate]~^ error: const arguments cannot yet be inferred with `_`
     let c: Foo<(((_)))> = Foo::<1>;
-    //[nogate]~^ error: const arguments cannot yet be inferred with `_`
 }
diff --git a/tests/ui/const-generics/generic_const_exprs/const_kind_expr/wf_obligation.rs b/tests/ui/const-generics/generic_const_exprs/const_kind_expr/wf_obligation.rs
index 6093fc70b1696..a82ea45b1232c 100644
--- a/tests/ui/const-generics/generic_const_exprs/const_kind_expr/wf_obligation.rs
+++ b/tests/ui/const-generics/generic_const_exprs/const_kind_expr/wf_obligation.rs
@@ -1,4 +1,4 @@
-#![feature(generic_const_exprs, generic_arg_infer)]
+#![feature(generic_const_exprs)]
 #![allow(incomplete_features)]
 
 // minimized repro for #105205
diff --git a/tests/ui/const-generics/generic_const_exprs/poly-const-uneval-ice-106423.rs b/tests/ui/const-generics/generic_const_exprs/poly-const-uneval-ice-106423.rs
index ed5ba32b62105..eca0404fcd01b 100644
--- a/tests/ui/const-generics/generic_const_exprs/poly-const-uneval-ice-106423.rs
+++ b/tests/ui/const-generics/generic_const_exprs/poly-const-uneval-ice-106423.rs
@@ -3,7 +3,7 @@
 //@ edition:2021
 //@ check-pass
 
-#![feature(generic_const_exprs, generic_arg_infer)]
+#![feature(generic_const_exprs)]
 #![allow(incomplete_features)]
 #![allow(unused)]
 
@@ -41,17 +41,13 @@ where
     DigitalFilter::Ba(zpk)
 }
 
-pub fn zpk2tf_st<const N: usize>(
-    _z: &Arr<f32, N>,
-    _p: &Arr<f32, N>,
-) -> BaFormatFilter<{ N + 1 }>
+pub fn zpk2tf_st<const N: usize>(_z: &Arr<f32, N>, _p: &Arr<f32, N>) -> BaFormatFilter<{ N + 1 }>
 where
     [(); N + 1]: Sized,
 {
     BaFormatFilter {}
 }
 
-
 fn main() {
-    iirfilter_st_copy::<4, 2>([10., 50.,]);
+    iirfilter_st_copy::<4, 2>([10., 50.]);
 }
diff --git a/tests/ui/const-generics/generic_const_parameter_types/bad_inference.rs b/tests/ui/const-generics/generic_const_parameter_types/bad_inference.rs
index de2e687e870c4..9748c14d655df 100644
--- a/tests/ui/const-generics/generic_const_parameter_types/bad_inference.rs
+++ b/tests/ui/const-generics/generic_const_parameter_types/bad_inference.rs
@@ -1,9 +1,4 @@
-#![feature(
-    adt_const_params,
-    unsized_const_params,
-    generic_const_parameter_types,
-    generic_arg_infer
-)]
+#![feature(adt_const_params, unsized_const_params, generic_const_parameter_types)]
 #![allow(incomplete_features)]
 
 use std::marker::ConstParamTy_;
diff --git a/tests/ui/const-generics/generic_const_parameter_types/bad_inference.stderr b/tests/ui/const-generics/generic_const_parameter_types/bad_inference.stderr
index 1ac67fe622b55..4652187b9ce18 100644
--- a/tests/ui/const-generics/generic_const_parameter_types/bad_inference.stderr
+++ b/tests/ui/const-generics/generic_const_parameter_types/bad_inference.stderr
@@ -1,11 +1,11 @@
 error: anonymous constants with inferred types are not yet supported
-  --> $DIR/bad_inference.rs:17:25
+  --> $DIR/bad_inference.rs:12:25
    |
 LL |     let a = foo::<_, _, { [12_u8; 2] }>();
    |                         ^^^^^^^^^^^^^^
 
 error: anonymous constants with inferred types are not yet supported
-  --> $DIR/bad_inference.rs:21:34
+  --> $DIR/bad_inference.rs:16:34
    |
 LL |     let b: [u8; 2] = foo::<_, _, { [12; _] }>();
    |                                  ^^^^^^^^^^^
diff --git a/tests/ui/const-generics/generic_const_parameter_types/evaluate_const_parameter_in_mir.rs b/tests/ui/const-generics/generic_const_parameter_types/evaluate_const_parameter_in_mir.rs
index 910deb6632d73..9f3ab1be2502e 100644
--- a/tests/ui/const-generics/generic_const_parameter_types/evaluate_const_parameter_in_mir.rs
+++ b/tests/ui/const-generics/generic_const_parameter_types/evaluate_const_parameter_in_mir.rs
@@ -1,11 +1,6 @@
 //@ check-pass
 
-#![feature(
-    adt_const_params,
-    unsized_const_params,
-    generic_const_parameter_types,
-    generic_arg_infer
-)]
+#![feature(adt_const_params, unsized_const_params, generic_const_parameter_types)]
 #![allow(incomplete_features)]
 
 use std::marker::ConstParamTy_;
diff --git a/tests/ui/const-generics/generic_const_parameter_types/inferred_from_arg.rs b/tests/ui/const-generics/generic_const_parameter_types/inferred_from_arg.rs
index d655fc174ee5c..a4e9aa54c01bb 100644
--- a/tests/ui/const-generics/generic_const_parameter_types/inferred_from_arg.rs
+++ b/tests/ui/const-generics/generic_const_parameter_types/inferred_from_arg.rs
@@ -1,6 +1,6 @@
 //@ check-pass
 
-#![feature(adt_const_params, generic_arg_infer, generic_const_parameter_types)]
+#![feature(adt_const_params, generic_const_parameter_types)]
 #![expect(incomplete_features)]
 
 struct Bar<const N: usize, const M: [u8; N]>;
diff --git a/tests/ui/const-generics/generic_const_parameter_types/unrelated_inferred_arg.rs b/tests/ui/const-generics/generic_const_parameter_types/unrelated_inferred_arg.rs
index b389e12884ea5..80117a27a23d2 100644
--- a/tests/ui/const-generics/generic_const_parameter_types/unrelated_inferred_arg.rs
+++ b/tests/ui/const-generics/generic_const_parameter_types/unrelated_inferred_arg.rs
@@ -1,11 +1,6 @@
 //@ check-pass
 
-#![feature(
-    adt_const_params,
-    unsized_const_params,
-    generic_const_parameter_types,
-    generic_arg_infer
-)]
+#![feature(adt_const_params, unsized_const_params, generic_const_parameter_types)]
 #![allow(incomplete_features)]
 
 use std::marker::ConstParamTy_;
diff --git a/tests/ui/const-generics/issues/issue-62878.min.stderr b/tests/ui/const-generics/issues/issue-62878.min.stderr
index d3d4fa4387109..d7ca0e1e2db59 100644
--- a/tests/ui/const-generics/issues/issue-62878.min.stderr
+++ b/tests/ui/const-generics/issues/issue-62878.min.stderr
@@ -16,17 +16,6 @@ help: add `#![feature(adt_const_params)]` to the crate attributes to enable more
 LL + #![feature(adt_const_params)]
    |
 
-error[E0658]: const arguments cannot yet be inferred with `_`
-  --> $DIR/issue-62878.rs:10:11
-   |
-LL |     foo::<_, { [1] }>();
-   |           ^
-   |
-   = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
-   = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error: aborting due to 3 previous errors
+error: aborting due to 2 previous errors
 
-Some errors have detailed explanations: E0658, E0770.
-For more information about an error, try `rustc --explain E0658`.
+For more information about this error, try `rustc --explain E0770`.
diff --git a/tests/ui/const-generics/issues/issue-62878.rs b/tests/ui/const-generics/issues/issue-62878.rs
index c80b46ddbc440..0c143b34ce91e 100644
--- a/tests/ui/const-generics/issues/issue-62878.rs
+++ b/tests/ui/const-generics/issues/issue-62878.rs
@@ -1,5 +1,5 @@
 //@ revisions: full min
-#![cfg_attr(full, feature(adt_const_params, generic_arg_infer))]
+#![cfg_attr(full, feature(adt_const_params))]
 #![cfg_attr(full, allow(incomplete_features))]
 
 fn foo<const N: usize, const A: [u8; N]>() {}
@@ -8,5 +8,4 @@ fn foo<const N: usize, const A: [u8; N]>() {}
 
 fn main() {
     foo::<_, { [1] }>();
-    //[min]~^ ERROR: const arguments cannot yet be inferred with `_`
 }
diff --git a/tests/ui/const-generics/min_const_generics/inferred_const.rs b/tests/ui/const-generics/min_const_generics/inferred_const.rs
index 0256ef732a346..4a4fb417ab1dd 100644
--- a/tests/ui/const-generics/min_const_generics/inferred_const.rs
+++ b/tests/ui/const-generics/min_const_generics/inferred_const.rs
@@ -1,4 +1,3 @@
-#![feature(generic_arg_infer)]
 //@ run-pass
 
 fn foo<const N: usize, const K: usize>(_data: [u32; N]) -> [u32; K] {
diff --git a/tests/ui/feature-gates/feature-gate-generic_arg_infer.normal.stderr b/tests/ui/feature-gates/feature-gate-generic_arg_infer.normal.stderr
deleted file mode 100644
index 73e6988b09cc8..0000000000000
--- a/tests/ui/feature-gates/feature-gate-generic_arg_infer.normal.stderr
+++ /dev/null
@@ -1,33 +0,0 @@
-error[E0658]: using `_` for array lengths is unstable
-  --> $DIR/feature-gate-generic_arg_infer.rs:13:18
-   |
-LL |     let _y: [u8; _] = [0; 3];
-   |                  ^ help: consider specifying the array length: `3`
-   |
-   = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
-   = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: const arguments cannot yet be inferred with `_`
-  --> $DIR/feature-gate-generic_arg_infer.rs:18:20
-   |
-LL |     let _x = foo::<_>([1, 2]);
-   |                    ^
-   |
-   = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
-   = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: using `_` for array lengths is unstable
-  --> $DIR/feature-gate-generic_arg_infer.rs:11:27
-   |
-LL |     let _x: [u8; 3] = [0; _];
-   |                           ^
-   |
-   = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
-   = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error: aborting due to 3 previous errors
-
-For more information about this error, try `rustc --explain E0658`.
diff --git a/tests/ui/feature-gates/feature-gate-generic_arg_infer.rs b/tests/ui/feature-gates/feature-gate-generic_arg_infer.rs
deleted file mode 100644
index 147978b0557a6..0000000000000
--- a/tests/ui/feature-gates/feature-gate-generic_arg_infer.rs
+++ /dev/null
@@ -1,21 +0,0 @@
-//@ [feature] run-pass
-//@ revisions: normal feature
-
-#![cfg_attr(feature, feature(generic_arg_infer))]
-
-fn foo<const N: usize>(_: [u8; N]) -> [u8; N] {
-    [0; N]
-}
-
-fn bar() {
-    let _x: [u8; 3] = [0; _];
-    //[normal]~^ ERROR: using `_` for array lengths is unstable
-    let _y: [u8; _] = [0; 3];
-    //[normal]~^ ERROR: using `_` for array lengths is unstable
-}
-
-fn main() {
-    let _x = foo::<_>([1, 2]);
-    //[normal]~^ ERROR: const arguments cannot yet be inferred with `_`
-    bar();
-}
diff --git a/tests/ui/lang-items/lang-item-generic-requirements.rs b/tests/ui/lang-items/lang-item-generic-requirements.rs
index 168e22ad7db68..2f80567d9e71a 100644
--- a/tests/ui/lang-items/lang-item-generic-requirements.rs
+++ b/tests/ui/lang-items/lang-item-generic-requirements.rs
@@ -56,14 +56,14 @@ fn ice() {
     let arr = [0; 5];
     //~^ ERROR requires `copy` lang_item
     let _ = arr[2];
-    //~^ ERROR cannot index into a value of type `[{integer}; 5]`
+    //~^ ERROR: cannot index into a value of type `[{integer}; 5]`
 
     // Use phantomdata
     let _ = MyPhantomData::<(), i32>;
 
     // Use Foo
     let _: () = Foo;
-    //~^ ERROR mismatched types
+    //~^ ERROR: mismatched types
 }
 
 // use `start`
diff --git a/tests/ui/object-lifetime/object-lifetime-default-inferred.rs b/tests/ui/object-lifetime/object-lifetime-default-inferred.rs
index 5abe09e272920..1ab821764de08 100644
--- a/tests/ui/object-lifetime/object-lifetime-default-inferred.rs
+++ b/tests/ui/object-lifetime/object-lifetime-default-inferred.rs
@@ -4,7 +4,6 @@
 
 
 #![allow(dead_code)]
-#![feature(generic_arg_infer)]
 
 trait Test {
     fn foo(&self) { }
diff --git a/tests/ui/parser/issues/issue-14303-fncall.rs b/tests/ui/parser/issues/issue-14303-fncall.rs
index 8f7fbec947067..1e8ef6af3fa93 100644
--- a/tests/ui/parser/issues/issue-14303-fncall.rs
+++ b/tests/ui/parser/issues/issue-14303-fncall.rs
@@ -1,7 +1,5 @@
-//@ revisions: full generic_arg
 // can't run rustfix because it doesn't handle multipart suggestions correctly
 // we need the above to avoid ast borrowck failure in recovered code
-#![cfg_attr(generic_arg, feature(generic_arg_infer))]
 
 struct S<'a, T> {
     a: &'a T,
@@ -10,8 +8,7 @@ struct S<'a, T> {
 
 fn foo<'a, 'b>(start: &'a usize, end: &'a usize) {
     let _x = (*start..*end).map(|x| S { a: start, b: end }).collect::<Vec<S<_, 'a>>>();
-    //[generic_arg]~^ ERROR placeholder provided when a lifetime was expected
-    //[full]~^^ ERROR placeholder provided when a lifetime was expected
+    //~^ ERROR placeholder provided when a lifetime was expected
 }
 
 fn main() {}
diff --git a/tests/ui/parser/issues/issue-14303-fncall.stderr b/tests/ui/parser/issues/issue-14303-fncall.stderr
new file mode 100644
index 0000000000000..c42a23fa9d3e9
--- /dev/null
+++ b/tests/ui/parser/issues/issue-14303-fncall.stderr
@@ -0,0 +1,9 @@
+error[E0747]: placeholder provided when a lifetime was expected
+  --> $DIR/issue-14303-fncall.rs:10:77
+   |
+LL |     let _x = (*start..*end).map(|x| S { a: start, b: end }).collect::<Vec<S<_, 'a>>>();
+   |                                                                             ^
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0747`.
diff --git a/tests/ui/pattern/slice-array-infer.rs b/tests/ui/pattern/slice-array-infer.rs
index fdead488ea11d..8d471b31beaf6 100644
--- a/tests/ui/pattern/slice-array-infer.rs
+++ b/tests/ui/pattern/slice-array-infer.rs
@@ -1,7 +1,6 @@
 //@ check-pass
 
 #![allow(unused_variables)]
-#![feature(generic_arg_infer)]
 
 struct Zeroes;
 impl Into<&'static [usize; 3]> for Zeroes {
diff --git a/tests/ui/repeat-expr/copy-check-const-element-uninferred-count.rs b/tests/ui/repeat-expr/copy-check-const-element-uninferred-count.rs
index 6115146539c19..722fdae6c99a2 100644
--- a/tests/ui/repeat-expr/copy-check-const-element-uninferred-count.rs
+++ b/tests/ui/repeat-expr/copy-check-const-element-uninferred-count.rs
@@ -1,5 +1,3 @@
-#![feature(generic_arg_infer)]
-
 // Test when deferring repeat expr copy checks to end of typechecking whether elements
 // that are const items allow for repeat counts to go uninferred without an error being
 // emitted if they would later wind up inferred by integer fallback.
diff --git a/tests/ui/repeat-expr/copy-check-const-element-uninferred-count.stderr b/tests/ui/repeat-expr/copy-check-const-element-uninferred-count.stderr
index 2f52537fa9407..9c9cfefd66383 100644
--- a/tests/ui/repeat-expr/copy-check-const-element-uninferred-count.stderr
+++ b/tests/ui/repeat-expr/copy-check-const-element-uninferred-count.stderr
@@ -1,5 +1,5 @@
 error[E0284]: type annotations needed for `[String; _]`
-  --> $DIR/copy-check-const-element-uninferred-count.rs:64:9
+  --> $DIR/copy-check-const-element-uninferred-count.rs:62:9
    |
 LL |     let a = [const { String::new() }; _];
    |         ^   ---------------------------- type must be known at this point
diff --git a/tests/ui/repeat-expr/copy-check-deferred-after-fallback.rs b/tests/ui/repeat-expr/copy-check-deferred-after-fallback.rs
index 3f310f07de0fe..a6bd5b299c96a 100644
--- a/tests/ui/repeat-expr/copy-check-deferred-after-fallback.rs
+++ b/tests/ui/repeat-expr/copy-check-deferred-after-fallback.rs
@@ -1,5 +1,3 @@
-#![feature(generic_arg_infer)]
-
 // Test when deferring repeat expr copy checks to end of typechecking whether they're
 // checked before integer fallback occurs or not. We accomplish this by having a repeat
 // count that can only be inferred after integer fallback has occured. This test will
diff --git a/tests/ui/repeat-expr/copy-check-deferred-after-fallback.stderr b/tests/ui/repeat-expr/copy-check-deferred-after-fallback.stderr
index 103b074dda7c8..0cd7ebe7494ff 100644
--- a/tests/ui/repeat-expr/copy-check-deferred-after-fallback.stderr
+++ b/tests/ui/repeat-expr/copy-check-deferred-after-fallback.stderr
@@ -1,5 +1,5 @@
 error[E0282]: type annotations needed for `[Foo<{integer}>; _]`
-  --> $DIR/copy-check-deferred-after-fallback.rs:39:9
+  --> $DIR/copy-check-deferred-after-fallback.rs:37:9
    |
 LL |     let b = [Foo(PhantomData); _];
    |         ^    ---------------- type must be known at this point
diff --git a/tests/ui/repeat-expr/copy-check-deferred-before-fallback.rs b/tests/ui/repeat-expr/copy-check-deferred-before-fallback.rs
index 4fbb8f0a00caf..23b13348f5a67 100644
--- a/tests/ui/repeat-expr/copy-check-deferred-before-fallback.rs
+++ b/tests/ui/repeat-expr/copy-check-deferred-before-fallback.rs
@@ -1,5 +1,4 @@
 //@ check-pass
-#![feature(generic_arg_infer)]
 
 // Test when deferring repeat expr checks to end of typechecking whether they're
 // checked before integer fallback occurs. We accomplish this by having the repeat
diff --git a/tests/ui/repeat-expr/copy-check-inference-side-effects.rs b/tests/ui/repeat-expr/copy-check-inference-side-effects.rs
index 4e3bfdead26b4..8587f1f9ce91c 100644
--- a/tests/ui/repeat-expr/copy-check-inference-side-effects.rs
+++ b/tests/ui/repeat-expr/copy-check-inference-side-effects.rs
@@ -1,5 +1,3 @@
-#![feature(generic_arg_infer)]
-
 struct Foo<const N: usize>;
 
 impl Clone for Foo<1> {
diff --git a/tests/ui/repeat-expr/copy-check-inference-side-effects.stderr b/tests/ui/repeat-expr/copy-check-inference-side-effects.stderr
index 505beff0f6b2e..bf4ae9b60bb31 100644
--- a/tests/ui/repeat-expr/copy-check-inference-side-effects.stderr
+++ b/tests/ui/repeat-expr/copy-check-inference-side-effects.stderr
@@ -1,5 +1,5 @@
 error[E0282]: type annotations needed for `[Foo<_>; 2]`
-  --> $DIR/copy-check-inference-side-effects.rs:17:9
+  --> $DIR/copy-check-inference-side-effects.rs:15:9
    |
 LL |     let a /* : [Foo<?x>; 2] */ = [Foo::<_>; 2];
    |         ^
@@ -13,7 +13,7 @@ LL |     let a: [Foo<N>; 2] /* : [Foo<?x>; 2] */ = [Foo::<_>; 2];
    |          +++++++++++++
 
 error[E0282]: type annotations needed for `[String; _]`
-  --> $DIR/copy-check-inference-side-effects.rs:27:9
+  --> $DIR/copy-check-inference-side-effects.rs:25:9
    |
 LL |     let b /* : [String; ?x] */ = ["string".to_string(); _];
    |         ^                         -------------------- type must be known at this point
diff --git a/tests/ui/repeat-expr/copy-check-when-count-inferred-later.rs b/tests/ui/repeat-expr/copy-check-when-count-inferred-later.rs
index b9d123cbefae6..72467e6f32e24 100644
--- a/tests/ui/repeat-expr/copy-check-when-count-inferred-later.rs
+++ b/tests/ui/repeat-expr/copy-check-when-count-inferred-later.rs
@@ -1,5 +1,3 @@
-#![feature(generic_arg_infer)]
-
 // Test that we enforce repeat expr element types are `Copy` even
 // when the repeat count is only inferred at a later point in type
 // checking.
diff --git a/tests/ui/repeat-expr/copy-check-when-count-inferred-later.stderr b/tests/ui/repeat-expr/copy-check-when-count-inferred-later.stderr
index 1c862f2b606a8..6b8049e77cc51 100644
--- a/tests/ui/repeat-expr/copy-check-when-count-inferred-later.stderr
+++ b/tests/ui/repeat-expr/copy-check-when-count-inferred-later.stderr
@@ -1,5 +1,5 @@
 error[E0277]: the trait bound `String: Copy` is not satisfied
-  --> $DIR/copy-check-when-count-inferred-later.rs:8:14
+  --> $DIR/copy-check-when-count-inferred-later.rs:6:14
    |
 LL |     let a = [String::new(); _];
    |              ^^^^^^^^^^^^^ the trait `Copy` is not implemented for `String`
diff --git a/tests/ui/repeat-expr/dont-require-copy-on-infer.rs b/tests/ui/repeat-expr/dont-require-copy-on-infer.rs
index e81bf1595be1f..ad0e4bd2be0ce 100644
--- a/tests/ui/repeat-expr/dont-require-copy-on-infer.rs
+++ b/tests/ui/repeat-expr/dont-require-copy-on-infer.rs
@@ -1,5 +1,4 @@
 //@ check-pass
-#![feature(generic_arg_infer)]
 
 fn main() {
     let a: [_; 1] = [String::new(); _];
diff --git a/tests/ui/repeat-expr/no-conservative-copy-impl-requirement.rs b/tests/ui/repeat-expr/no-conservative-copy-impl-requirement.rs
index eb70df62996fb..df79ad51b4215 100644
--- a/tests/ui/repeat-expr/no-conservative-copy-impl-requirement.rs
+++ b/tests/ui/repeat-expr/no-conservative-copy-impl-requirement.rs
@@ -1,5 +1,3 @@
-#![feature(generic_arg_infer)]
-
 struct Foo<const N: usize>;
 
 impl Clone for Foo<1> {
diff --git a/tests/ui/repeat-expr/no-conservative-copy-impl-requirement.stderr b/tests/ui/repeat-expr/no-conservative-copy-impl-requirement.stderr
index 04f8ff33fdab3..bf1e46e4ef829 100644
--- a/tests/ui/repeat-expr/no-conservative-copy-impl-requirement.stderr
+++ b/tests/ui/repeat-expr/no-conservative-copy-impl-requirement.stderr
@@ -1,5 +1,5 @@
 error[E0282]: type annotations needed for `&[Foo<_>; _]`
-  --> $DIR/no-conservative-copy-impl-requirement.rs:17:9
+  --> $DIR/no-conservative-copy-impl-requirement.rs:15:9
    |
 LL |     let x = &[Foo::<_>; _];
    |         ^     -------- type must be known at this point
diff --git a/tests/ui/simd/const-err-trumps-simd-err.rs b/tests/ui/simd/const-err-trumps-simd-err.rs
index 8d9870855f807..33f0abb06f3ea 100644
--- a/tests/ui/simd/const-err-trumps-simd-err.rs
+++ b/tests/ui/simd/const-err-trumps-simd-err.rs
@@ -4,7 +4,6 @@
 //! Make sure that monomorphization-time const errors from `static_assert` take priority over the
 //! error from simd_extract. Basically this checks that if a const fails to evaluate in some
 //! function, we don't bother codegen'ing the function.
-#![feature(generic_arg_infer)]
 #![feature(core_intrinsics)]
 #![feature(repr_simd)]
 
diff --git a/tests/ui/simd/const-err-trumps-simd-err.stderr b/tests/ui/simd/const-err-trumps-simd-err.stderr
index d4ba54a28da7e..93d1fce637f2f 100644
--- a/tests/ui/simd/const-err-trumps-simd-err.stderr
+++ b/tests/ui/simd/const-err-trumps-simd-err.stderr
@@ -1,17 +1,17 @@
 error[E0080]: evaluation panicked: assertion failed: LANE < 4
-  --> $DIR/const-err-trumps-simd-err.rs:18:13
+  --> $DIR/const-err-trumps-simd-err.rs:17:13
    |
 LL |     const { assert!(LANE < 4); } // the error should be here...
    |             ^^^^^^^^^^^^^^^^^ evaluation of `get_elem::<4>::{constant#0}` failed here
 
 note: erroneous constant encountered
-  --> $DIR/const-err-trumps-simd-err.rs:18:5
+  --> $DIR/const-err-trumps-simd-err.rs:17:5
    |
 LL |     const { assert!(LANE < 4); } // the error should be here...
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 note: the above error was encountered while instantiating `fn get_elem::<4>`
-  --> $DIR/const-err-trumps-simd-err.rs:24:5
+  --> $DIR/const-err-trumps-simd-err.rs:23:5
    |
 LL |     get_elem::<4>(int8x4_t([0, 0, 0, 0]));
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/tests/ui/span/issue-42234-unknown-receiver-type.rs b/tests/ui/span/issue-42234-unknown-receiver-type.rs
index 53d1e3eed820e..8f7bbf0fe5e09 100644
--- a/tests/ui/span/issue-42234-unknown-receiver-type.rs
+++ b/tests/ui/span/issue-42234-unknown-receiver-type.rs
@@ -1,6 +1,3 @@
-//@ revisions: full generic_arg
-#![cfg_attr(generic_arg, feature(generic_arg_infer))]
-
 // When the type of a method call's receiver is unknown, the span should point
 // to the receiver (and not the entire call, as was previously the case before
 // the fix of which this tests).
diff --git a/tests/ui/span/issue-42234-unknown-receiver-type.stderr b/tests/ui/span/issue-42234-unknown-receiver-type.stderr
new file mode 100644
index 0000000000000..10308ec07da5a
--- /dev/null
+++ b/tests/ui/span/issue-42234-unknown-receiver-type.stderr
@@ -0,0 +1,23 @@
+error[E0282]: type annotations needed
+  --> $DIR/issue-42234-unknown-receiver-type.rs:6:24
+   |
+LL |     let x: Option<_> = None;
+   |                        ^^^^ cannot infer type of the type parameter `T` declared on the enum `Option`
+LL |     x.unwrap().method_that_could_exist_on_some_type();
+   |     ---------- type must be known at this point
+   |
+help: consider specifying the generic argument
+   |
+LL |     let x: Option<_> = None::<T>;
+   |                            +++++
+
+error[E0282]: type annotations needed
+  --> $DIR/issue-42234-unknown-receiver-type.rs:12:10
+   |
+LL |         .sum::<_>()
+   |          ^^^ cannot infer type of the type parameter `S` declared on the method `sum`
+   |
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0282`.
diff --git a/tests/ui/traits/const-traits/tilde-const-and-const-params.rs b/tests/ui/traits/const-traits/tilde-const-and-const-params.rs
index 706c77b6200a8..428223d92c01e 100644
--- a/tests/ui/traits/const-traits/tilde-const-and-const-params.rs
+++ b/tests/ui/traits/const-traits/tilde-const-and-const-params.rs
@@ -1,5 +1,4 @@
 #![feature(const_trait_impl)]
-#![feature(generic_arg_infer)]
 #![feature(generic_const_exprs)]
 #![allow(incomplete_features)]
 
diff --git a/tests/ui/traits/const-traits/tilde-const-and-const-params.stderr b/tests/ui/traits/const-traits/tilde-const-and-const-params.stderr
index f77d63db054a0..95e684bd0c47d 100644
--- a/tests/ui/traits/const-traits/tilde-const-and-const-params.stderr
+++ b/tests/ui/traits/const-traits/tilde-const-and-const-params.stderr
@@ -1,35 +1,35 @@
 error: `~const` is not allowed here
-  --> $DIR/tilde-const-and-const-params.rs:9:15
+  --> $DIR/tilde-const-and-const-params.rs:8:15
    |
 LL |     fn add<A: ~const Add42>(self) -> Foo<{ A::add(N) }> {
    |               ^^^^^^
    |
 note: this function is not `const`, so it cannot have `~const` trait bounds
-  --> $DIR/tilde-const-and-const-params.rs:9:8
+  --> $DIR/tilde-const-and-const-params.rs:8:8
    |
 LL |     fn add<A: ~const Add42>(self) -> Foo<{ A::add(N) }> {
    |        ^^^
 
 error: `~const` is not allowed here
-  --> $DIR/tilde-const-and-const-params.rs:27:11
+  --> $DIR/tilde-const-and-const-params.rs:26:11
    |
 LL | fn bar<A: ~const Add42, const N: usize>(_: Foo<N>) -> Foo<{ A::add(N) }> {
    |           ^^^^^^
    |
 note: this function is not `const`, so it cannot have `~const` trait bounds
-  --> $DIR/tilde-const-and-const-params.rs:27:4
+  --> $DIR/tilde-const-and-const-params.rs:26:4
    |
 LL | fn bar<A: ~const Add42, const N: usize>(_: Foo<N>) -> Foo<{ A::add(N) }> {
    |    ^^^
 
 error[E0277]: the trait bound `A: const Add42` is not satisfied
-  --> $DIR/tilde-const-and-const-params.rs:27:61
+  --> $DIR/tilde-const-and-const-params.rs:26:61
    |
 LL | fn bar<A: ~const Add42, const N: usize>(_: Foo<N>) -> Foo<{ A::add(N) }> {
    |                                                             ^
 
 error[E0277]: the trait bound `A: const Add42` is not satisfied
-  --> $DIR/tilde-const-and-const-params.rs:9:44
+  --> $DIR/tilde-const-and-const-params.rs:8:44
    |
 LL |     fn add<A: ~const Add42>(self) -> Foo<{ A::add(N) }> {
    |                                            ^
diff --git a/triagebot.toml b/triagebot.toml
index e5af77b6d443f..98eb99d9c6077 100644
--- a/triagebot.toml
+++ b/triagebot.toml
@@ -1235,7 +1235,6 @@ compiler = [
 libs = [
     "@Mark-Simulacrum",
     "@workingjubilee",
-    "@joboet",
     "@jhpratt",
     "@tgross35",
     "@thomcc",