rust/tests/ui/fn/implied-bounds-impl-header-projections.rs

32 lines
629 B
Rust

// check-pass
// known-bug: #100051
// Should fail. Implied bounds from projections in impl headers can create
// improper lifetimes. Variant of issue #98543 which was fixed by #99217.
trait Trait {
type Type;
}
impl<T> Trait for T {
type Type = ();
}
trait Extend<'a, 'b> {
fn extend(self, s: &'a str) -> &'b str;
}
impl<'a, 'b> Extend<'a, 'b> for <&'b &'a () as Trait>::Type
where
for<'what, 'ever> &'what &'ever (): Trait,
{
fn extend(self, s: &'a str) -> &'b str {
s
}
}
fn main() {
let y = <() as Extend<'_, '_>>::extend((), &String::from("Hello World"));
println!("{}", y);
}