tests/ui/regions/regions-outlives-projection-trait-def.rs


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21

// 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() { }