diff options
Diffstat (limited to 'src/test/ui/type-alias-impl-trait/issue-63677-type-alias-coherence.rs')
-rw-r--r-- | src/test/ui/type-alias-impl-trait/issue-63677-type-alias-coherence.rs | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/test/ui/type-alias-impl-trait/issue-63677-type-alias-coherence.rs b/src/test/ui/type-alias-impl-trait/issue-63677-type-alias-coherence.rs new file mode 100644 index 000000000..28f4a85c9 --- /dev/null +++ b/src/test/ui/type-alias-impl-trait/issue-63677-type-alias-coherence.rs @@ -0,0 +1,21 @@ +// check-pass +// Regression test for issue #63677 - ensure that +// coherence checking can properly handle 'impl trait' +// in type aliases +#![feature(type_alias_impl_trait)] + +pub trait Trait {} +pub struct S1<T>(T); +pub struct S2<T>(T); + +pub type T1 = impl Trait; +pub type T2 = S1<T1>; +pub type T3 = S2<T2>; + +impl<T> Trait for S1<T> {} +impl<T: Trait> S2<T> {} +impl T3 {} + +pub fn use_t1() -> T1 { S1(()) } + +fn main() {} |