diff options
4 files changed, 44 insertions, 0 deletions
diff --git a/compiler/rustc_hir_typeck/src/writeback.rs b/compiler/rustc_hir_typeck/src/writeback.rs index 31caa52d267..e337105f011 100644 --- a/compiler/rustc_hir_typeck/src/writeback.rs +++ b/compiler/rustc_hir_typeck/src/writeback.rs @@ -865,6 +865,7 @@ impl<'cx, 'tcx> TypeFolder<TyCtxt<'tcx>> for Resolver<'cx, 'tcx> { self.handle_term(ct, ty::Const::outer_exclusive_binder, |tcx, guar| { ty::Const::new_error(tcx, guar, ct.ty()) }) + .super_fold_with(self) } fn fold_predicate(&mut self, predicate: ty::Predicate<'tcx>) -> ty::Predicate<'tcx> { diff --git a/tests/ui/type-alias-impl-trait/const_generic_type.infer.stderr b/tests/ui/type-alias-impl-trait/const_generic_type.infer.stderr new file mode 100644 index 00000000000..6a1a770228d --- /dev/null +++ b/tests/ui/type-alias-impl-trait/const_generic_type.infer.stderr @@ -0,0 +1,10 @@ +error: `Bar` is forbidden as the type of a const generic parameter + --> $DIR/const_generic_type.rs:7:24 + | +LL | async fn test<const N: crate::Bar>() { + | ^^^^^^^^^^ + | + = note: the only supported types are integers, `bool` and `char` + +error: aborting due to 1 previous error + diff --git a/tests/ui/type-alias-impl-trait/const_generic_type.no_infer.stderr b/tests/ui/type-alias-impl-trait/const_generic_type.no_infer.stderr new file mode 100644 index 00000000000..a1a69bfaca3 --- /dev/null +++ b/tests/ui/type-alias-impl-trait/const_generic_type.no_infer.stderr @@ -0,0 +1,19 @@ +error[E0283]: type annotations needed + --> $DIR/const_generic_type.rs:7:1 + | +LL | async fn test<const N: crate::Bar>() { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type + | + = note: cannot satisfy `_: std::fmt::Display` + +error: `Bar` is forbidden as the type of a const generic parameter + --> $DIR/const_generic_type.rs:7:24 + | +LL | async fn test<const N: crate::Bar>() { + | ^^^^^^^^^^ + | + = note: the only supported types are integers, `bool` and `char` + +error: aborting due to 2 previous errors + +For more information about this error, try `rustc --explain E0283`. diff --git a/tests/ui/type-alias-impl-trait/const_generic_type.rs b/tests/ui/type-alias-impl-trait/const_generic_type.rs new file mode 100644 index 00000000000..95a5e1c6286 --- /dev/null +++ b/tests/ui/type-alias-impl-trait/const_generic_type.rs @@ -0,0 +1,14 @@ +//@edition: 2021 +//@revisions: infer no_infer + +#![feature(type_alias_impl_trait)] +type Bar = impl std::fmt::Display; + +async fn test<const N: crate::Bar>() { + //[no_infer]~^ ERROR: type annotations needed + //~^^ ERROR: `Bar` is forbidden as the type of a const generic parameter + #[cfg(infer)] + let x: u32 = N; +} + +fn main() {} |