44 lines
1.3 KiB
Rust
44 lines
1.3 KiB
Rust
|
//@ 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() {}
|