diff options
3 files changed, 33 insertions, 1 deletions
diff --git a/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs b/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs index c7e71a626dc..0ff00e752a2 100644 --- a/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs +++ b/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs @@ -136,7 +136,10 @@ pub fn suggest_restriction<'tcx, G: EmissionGuarantee>( ) { if hir_generics.where_clause_span.from_expansion() || hir_generics.where_clause_span.desugaring_kind().is_some() - || projection.is_some_and(|projection| tcx.is_impl_trait_in_trait(projection.def_id)) + || projection.is_some_and(|projection| { + tcx.is_impl_trait_in_trait(projection.def_id) + || tcx.lookup_stability(projection.def_id).is_some_and(|stab| stab.is_unstable()) + }) { return; } diff --git a/tests/ui/async-await/async-fn/suggest-constrain.rs b/tests/ui/async-await/async-fn/suggest-constrain.rs new file mode 100644 index 00000000000..319dcc0084a --- /dev/null +++ b/tests/ui/async-await/async-fn/suggest-constrain.rs @@ -0,0 +1,11 @@ +// Ensure that we don't suggest constraining `CallRefFuture` here, +// since that isn't stable. + +fn spawn<F: AsyncFn() + Send>(f: F) { + check_send(f()); + //~^ ERROR cannot be sent between threads safely +} + +fn check_send<T: Send>(_: T) {} + +fn main() {} diff --git a/tests/ui/async-await/async-fn/suggest-constrain.stderr b/tests/ui/async-await/async-fn/suggest-constrain.stderr new file mode 100644 index 00000000000..94270aad63e --- /dev/null +++ b/tests/ui/async-await/async-fn/suggest-constrain.stderr @@ -0,0 +1,18 @@ +error[E0277]: `<F as AsyncFnMut<()>>::CallRefFuture<'_>` cannot be sent between threads safely + --> $DIR/suggest-constrain.rs:5:16 + | +LL | check_send(f()); + | ---------- ^^^ `<F as AsyncFnMut<()>>::CallRefFuture<'_>` cannot be sent between threads safely + | | + | required by a bound introduced by this call + | + = help: the trait `Send` is not implemented for `<F as AsyncFnMut<()>>::CallRefFuture<'_>` +note: required by a bound in `check_send` + --> $DIR/suggest-constrain.rs:9:18 + | +LL | fn check_send<T: Send>(_: T) {} + | ^^^^ required by this bound in `check_send` + +error: aborting due to 1 previous error + +For more information about this error, try `rustc --explain E0277`. |