diff --git a/tests/ui/type-alias-impl-trait/closure-normalization-ice-109020.rs b/tests/ui/type-alias-impl-trait/closure-normalization-ice-109020.rs new file mode 100644 index 000000000000..c5ee46024f98 --- /dev/null +++ b/tests/ui/type-alias-impl-trait/closure-normalization-ice-109020.rs @@ -0,0 +1,41 @@ +// ICE Failed to normalize closure with TAIT +// issue: rust-lang/rust#109020 +//@ check-pass + +#![feature(type_alias_impl_trait)] + +use std::marker::PhantomData; + +type WithEmplacableForFn<'a> = impl EmplacableFn + 'a; + +fn with_emplacable_for<'a, F, R>(mut f: F) -> R +where + F: for<'b> FnMut(Emplacable>) -> R, +{ + fn with_emplacable_for_inner<'a, R>( + _: &'a (), + _: &mut dyn FnMut(Emplacable>) -> R, + ) -> R { + fn _constrain(_: &mut ()) -> WithEmplacableForFn<'_> { + () + } + loop {} + } + + with_emplacable_for_inner(&(), &mut f) +} + +trait EmplacableFn {} + +impl EmplacableFn for () {} + +struct Emplacable +where + F: EmplacableFn, +{ + phantom: PhantomData, +} + +fn main() { + with_emplacable_for(|_| {}); +}