Correctly handle body scope

Author: GuillaumeGomez

clippy_lints/src/transmute/missing_transmute_annotations.rs

@@ -1,6 +1,6 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
 use rustc_errors::Applicability;
-use rustc_hir::{GenericArg, HirId, ItemKind, Local, Node, Path, TyKind};
+use rustc_hir::{GenericArg, HirId, Local, Node, Path, TyKind};
 use rustc_lint::LateContext;
 use rustc_middle::lint::in_external_macro;
 use rustc_middle::ty::Ty;
@@ -29,13 +29,10 @@ fn get_parent_local_binding_ty<'tcx>(cx: &LateContext<'tcx>, expr_hir_id: HirId)
 }
 
 fn is_function_block(cx: &LateContext<'_>, expr_hir_id: HirId) -> bool {
-    for (_, node) in cx.tcx.hir().parent_iter(expr_hir_id) {
-        if let Node::Item(item) = node
-            && let ItemKind::Fn(_, _, body_id) = item.kind
-        {
-            let body = cx.tcx.hir().body(body_id);
-            return body.value.peel_blocks().hir_id == expr_hir_id;
-        }
+    let def_id = cx.tcx.hir().enclosing_body_owner(expr_hir_id);
+    if let Some(body_id) = cx.tcx.hir().maybe_body_owned_by(def_id) {
+        let body = cx.tcx.hir().body(body_id);
+        return body.value.peel_blocks().hir_id == expr_hir_id;
     }
     false
 }

tests/ui/missing_transmute_annotations.fixed

@@ -22,6 +22,9 @@ unsafe fn foo1() -> i32 {
     std::mem::transmute([1u16, 2u16])
 }
 
+// Should not warn!
+const _: i32 = unsafe { std::mem::transmute([1u16, 2u16]) };
+
 #[repr(i32)]
 enum Foo {
     A = 0,

tests/ui/missing_transmute_annotations.rs

@@ -22,6 +22,9 @@ unsafe fn foo1() -> i32 {
     std::mem::transmute([1u16, 2u16])
 }
 
+// Should not warn!
+const _: i32 = unsafe { std::mem::transmute([1u16, 2u16]) };
+
 #[repr(i32)]
 enum Foo {
     A = 0,

tests/ui/missing_transmute_annotations.stderr

@@ -1,5 +1,5 @@
 error: transmute used without annotations
-  --> tests/ui/missing_transmute_annotations.rs:32:19
+  --> tests/ui/missing_transmute_annotations.rs:35:19
    |
 LL |     i = std::mem::transmute([1u16, 2u16]);
    |                   ^^^^^^^^^ help: consider adding missing annotations: `transmute::<[u16; 2], i32>`
@@ -8,31 +8,31 @@ LL |     i = std::mem::transmute([1u16, 2u16]);
    = help: to override `-D warnings` add `#[allow(clippy::missing_transmute_annotations)]`
 
 error: transmute used without annotations
-  --> tests/ui/missing_transmute_annotations.rs:34:19
+  --> tests/ui/missing_transmute_annotations.rs:37:19
    |
 LL |     i = std::mem::transmute::<_, _>([1u16, 2u16]);
    |                   ^^^^^^^^^^^^^^^^^ help: consider adding missing annotations: `transmute::<[u16; 2], i32>`
 
 error: transmute used without annotations
-  --> tests/ui/missing_transmute_annotations.rs:36:19
+  --> tests/ui/missing_transmute_annotations.rs:39:19
    |
 LL |     i = std::mem::transmute::<_, i32>([1u16, 2u16]);
    |                   ^^^^^^^^^^^^^^^^^^^ help: consider adding missing annotations: `transmute::<[u16; 2], i32>`
 
 error: transmute used without annotations
-  --> tests/ui/missing_transmute_annotations.rs:38:19
+  --> tests/ui/missing_transmute_annotations.rs:41:19
    |
 LL |     i = std::mem::transmute::<[u16; 2], _>([1u16, 2u16]);
    |                   ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider adding missing annotations: `transmute::<[u16; 2], i32>`
 
 error: transmute used without annotations
-  --> tests/ui/missing_transmute_annotations.rs:41:32
+  --> tests/ui/missing_transmute_annotations.rs:44:32
    |
 LL |     let x: i32 = bar(std::mem::transmute::<[u16; 2], _>([1u16, 2u16]));
    |                                ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider adding missing annotations: `transmute::<[u16; 2], i32>`
 
 error: transmute used without annotations
-  --> tests/ui/missing_transmute_annotations.rs:43:19
+  --> tests/ui/missing_transmute_annotations.rs:46:19
    |
 LL |     bar(std::mem::transmute::<[u16; 2], _>([1u16, 2u16]));
    |                   ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider adding missing annotations: `transmute::<[u16; 2], i32>`
@@ -49,25 +49,25 @@ LL |     i = local_bad_transmute!([1u16, 2u16]);
    = note: this error originates in the macro `local_bad_transmute` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: transmute used without annotations
-  --> tests/ui/missing_transmute_annotations.rs:51:19
+  --> tests/ui/missing_transmute_annotations.rs:54:19
    |
 LL |     i = std::mem::transmute([0i16, 0i16]);
    |                   ^^^^^^^^^ help: consider adding missing annotations: `transmute::<[i16; 2], i32>`
 
 error: transmute used without annotations
-  --> tests/ui/missing_transmute_annotations.rs:54:19
+  --> tests/ui/missing_transmute_annotations.rs:57:19
    |
 LL |     i = std::mem::transmute(Foo::A);
    |                   ^^^^^^^^^ help: consider adding missing annotations: `transmute::<Foo, i32>`
 
 error: transmute used without annotations
-  --> tests/ui/missing_transmute_annotations.rs:61:35
+  --> tests/ui/missing_transmute_annotations.rs:64:35
    |
 LL |     let x: _ = unsafe { std::mem::transmute::<_, i32>([1u16, 2u16]) };
    |                                   ^^^^^^^^^^^^^^^^^^^ help: consider adding missing annotations: `transmute::<[u16; 2], i32>`
 
 error: transmute used without annotations
-  --> tests/ui/missing_transmute_annotations.rs:64:30
+  --> tests/ui/missing_transmute_annotations.rs:67:30
    |
 LL |         let x: _ = std::mem::transmute::<_, i32>([1u16, 2u16]);
    |                              ^^^^^^^^^^^^^^^^^^^ help: consider adding missing annotations: `transmute::<[u16; 2], i32>`