rust/tests/ui/regions/regions-outlives-projection-trait-def.rs
2024-02-16 20:02:50 +00:00

22 lines
597 B
Rust

// Test that `<F as Foo<'a>>::Type: 'b`, where `trait Foo<'a> { Type:
// 'a; }`, does not require that `F: 'b`.
//@ check-pass
#![allow(dead_code)]
trait SomeTrait<'a> {
type Type: 'a;
}
impl<'a: 'c, 'c, T> SomeTrait<'a> for &'c T where T: SomeTrait<'a> {
type Type = <T as SomeTrait<'a>>::Type;
// ~~~~~~~~~~~~~~~~~~~~~~~~~~
// |
// Note that this type must outlive 'a, due to the trait
// definition. If we fall back to OutlivesProjectionComponents
// here, then we would require that `T:'a`, which is too strong.
}
fn main() { }