| // Regression test for #47511: anonymous lifetimes can appear |
| // unconstrained in a return type, but only if they appear just once |
| // in the input, as the input to a projection. |
| |
| fn f(_: X) -> X { |
| //~^ ERROR return type references an anonymous lifetime |
| unimplemented!() |
| } |
| |
| fn g<'a>(_: X<'a>) -> X<'a> { |
| //~^ ERROR return type references lifetime `'a`, which is not constrained |
| unimplemented!() |
| } |
| |
| type X<'a> = <&'a () as Trait>::Value; |
| |
| trait Trait { |
| type Value; |
| } |
| |
| impl<'a> Trait for &'a () { |
| type Value = (); |
| } |
| |
| fn main() {} |
