| // check-pass | |
| trait Foo<Args> { | |
| type Output; | |
| } | |
| trait Bar<'a, T>: for<'s> Foo<&'s T, Output=bool> { | |
| fn cb(&self) -> Box<dyn Bar<'a, T, Output=bool>>; | |
| } | |
| impl<'s> Foo<&'s ()> for () { | |
| type Output = bool; | |
| } | |
| impl<'a> Bar<'a, ()> for () { | |
| fn cb(&self) -> Box<dyn Bar<'a, (), Output=bool>> { | |
| Box::new(*self) | |
| } | |
| } | |
| fn main() { | |
| let _t = ().cb(); | |
| } |