ignore type flags insertion in default_anon_const_substs if error occurred

Author: b-naber

compiler/rustc_typeck/src/collect/type_of.rs

@@ -292,7 +292,8 @@ pub(super) fn default_anon_const_substs(tcx: TyCtxt<'_>, def_id: DefId) -> Subst
     // Getting this wrong can lead to ICE and unsoundness, so we assert it here.
     for arg in substs.iter() {
         let allowed_flags = ty::TypeFlags::MAY_NEED_DEFAULT_CONST_SUBSTS
-            | ty::TypeFlags::STILL_FURTHER_SPECIALIZABLE;
+            | ty::TypeFlags::STILL_FURTHER_SPECIALIZABLE
+            | ty::TypeFlags::HAS_ERROR;
         assert!(!arg.has_type_flags(!allowed_flags));
     }
     substs

src/test/ui/const-generics/issues/issue-88997.rs

@@ -0,0 +1,14 @@
+#![allow(incomplete_features)]
+#![feature(generic_const_exprs)]
+
+struct ConstAssert<const COND: bool>;
+trait True {}
+impl True for ConstAssert<true> {}
+
+struct Range<T: PartialOrd, const MIN: T, const MAX: T>(T)
+//~^ ERROR the type of const parameters must not depend on other generic parameters
+//~| ERROR the type of const parameters must not depend on other generic parameters
+where
+    ConstAssert<{ MIN <= MAX }>: True;
+
+fn main() {}

src/test/ui/const-generics/issues/issue-88997.stderr

@@ -0,0 +1,15 @@
+error[E0770]: the type of const parameters must not depend on other generic parameters
+  --> $DIR/issue-88997.rs:8:40
+   |
+LL | struct Range<T: PartialOrd, const MIN: T, const MAX: T>(T)
+   |                                        ^ the type must not depend on the parameter `T`
+
+error[E0770]: the type of const parameters must not depend on other generic parameters
+  --> $DIR/issue-88997.rs:8:54
+   |
+LL | struct Range<T: PartialOrd, const MIN: T, const MAX: T>(T)
+   |                                                      ^ the type must not depend on the parameter `T`
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0770`.

src/test/ui/const-generics/issues/issue-90364.rs

@@ -0,0 +1,9 @@
+#![feature(generic_const_exprs)]
+#![allow(incomplete_features)]
+
+pub struct Foo<T, const H: T>(T)
+//~^ ERROR the type of const parameters must not depend on other generic parameters
+where
+    [(); 1]:;
+
+fn main() {}

src/test/ui/const-generics/issues/issue-90364.stderr

@@ -0,0 +1,9 @@
+error[E0770]: the type of const parameters must not depend on other generic parameters
+  --> $DIR/issue-90364.rs:4:28
+   |
+LL | pub struct Foo<T, const H: T>(T)
+   |                            ^ the type must not depend on the parameter `T`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0770`.