| // 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() {} |