| use std::mem; |
| |
| trait Trait1<T> {} |
| trait Trait2<'a> { |
| type Ty; |
| } |
| |
| fn _ice(param: Box<dyn for <'a> Trait1<<() as Trait2<'a>>::Ty>>) { |
| //~^ ERROR the trait bound `for<'a> (): Trait2<'a>` is not satisfied |
| //~| ERROR the trait bound `for<'a> (): Trait2<'a>` is not satisfied |
| let _e: (usize, usize) = unsafe{mem::transmute(param)}; |
| } |
| |
| trait Lifetime<'a> { |
| type Out; |
| } |
| impl<'a> Lifetime<'a> for () { |
| type Out = &'a (); |
| } |
| fn foo<'a>(x: &'a ()) -> <() as Lifetime<'a>>::Out { |
| x |
| } |
| |
| fn takes_lifetime(_f: for<'a> fn(&'a ()) -> <() as Lifetime<'a>>::Out) { |
| } |
| |
| fn main() { |
| takes_lifetime(foo); |
| } |
