rust/tests/ui/impl-header-lifetime-elision/path-underscore.rs

35 lines
606 B
Rust

// Test that `impl MyTrait for Foo<'_>` works.
//@ run-pass
#![allow(warnings)]
trait MyTrait { }
struct Foo<'a> { x: &'a u32 }
impl MyTrait for Foo<'_> {
}
fn impls_my_trait<T: MyTrait>() { }
fn impls_my_trait_val<T: MyTrait>(_: T) {
impls_my_trait::<T>();
}
fn random_where_clause()
where for<'a> Foo<'a>: MyTrait { }
fn main() {
let x = 22;
let f = Foo { x: &x };
// This type is `Foo<'x>` for a local lifetime `'x`; so the impl
// must apply to any lifetime to apply to this.
impls_my_trait_val(f);
impls_my_trait::<Foo<'static>>();
random_where_clause();
}