| //@ run-rustfix |
| // |
| #![allow(warnings)] |
| struct Wrapper<'a, T: ?Sized>(&'a T); |
| |
| trait Project { |
| type Projected<'a> where Self: 'a; |
| fn project(this: Wrapper<'_, Self>) -> Self::Projected<'_>; |
| } |
| trait MyTrait {} |
| trait ProjectedMyTrait {} |
| |
| impl<T> Project for Option<T> { |
| type Projected<'a> = Option<Wrapper<'a, T>> where T: 'a; |
| fn project(this: Wrapper<'_, Self>) -> Self::Projected<'_> { |
| this.0.as_ref().map(Wrapper) |
| } |
| } |
| |
| impl<T: MyTrait> MyTrait for Option<Wrapper<'_, T>> {} |
| |
| impl<T: ProjectedMyTrait> MyTrait for Wrapper<'_, T> {} |
| |
| impl<T> ProjectedMyTrait for T |
| where |
| T: Project, |
| for<'a> T::Projected<'a>: MyTrait, |
| //~^ NOTE due to current limitations in the borrow checker, this implies a `'static` lifetime |
| //~| NOTE due to current limitations in the borrow checker, this implies a `'static` lifetime |
| {} |
| |
| fn require_trait<T: MyTrait>(_: T) {} |
| |
| fn foo<T : MyTrait + 'static + 'static, U : MyTrait + 'static + 'static>(wrap: Wrapper<'_, Option<T>>, wrap1: Wrapper<'_, Option<U>>) { |
| //~^ HELP consider restricting the type parameter to the `'static` lifetime |
| //~| HELP consider restricting the type parameter to the `'static` lifetime |
| require_trait(wrap); |
| //~^ ERROR `T` does not live long enough |
| require_trait(wrap1); |
| //~^ ERROR `U` does not live long enough |
| } |
| |
| fn main() {} |