error: lifetime may not live long enough
--> tests/ui/covariant.rs:11:5
|
10 | fn require_contravariant<'a>(phantom: CovariantPhantom<&'a str>) -> CovariantPhantom<&'static str> {
| -- lifetime `'a` defined here
11 | phantom
| ^^^^^^^ returning this value requires that `'a` must outlive `'static`