mirror of https://github.com/rust-lang/rust
28 lines
612 B
Rust
28 lines
612 B
Rust
#![allow(dead_code)]
|
|
|
|
// Test that even when `T` is only used in contravariant position, it
|
|
// is treated as invariant.
|
|
|
|
trait Get<T> : 'static {
|
|
fn get(&self, t: T);
|
|
}
|
|
|
|
fn get_min_from_max<'min, 'max>(v: Box<dyn Get<&'max i32>>)
|
|
-> Box<dyn Get<&'min i32>>
|
|
where 'max : 'min
|
|
{
|
|
v
|
|
//~^ ERROR lifetime may not live long enough
|
|
}
|
|
|
|
fn get_max_from_min<'min, 'max>(v: Box<dyn Get<&'min i32>>)
|
|
-> Box<dyn Get<&'max i32>>
|
|
where 'max : 'min
|
|
{
|
|
// Previously OK:
|
|
v
|
|
//~^ ERROR lifetime may not live long enough
|
|
}
|
|
|
|
fn main() { }
|