mirror of https://github.com/rust-lang/rust
24 lines
666 B
Rust
24 lines
666 B
Rust
//@ run-pass
|
|
#![allow(dead_code)]
|
|
// Test that a type which is covariant with respect to its region
|
|
// parameter is successful when used in a covariant way.
|
|
//
|
|
// Note: see ui/variance/variance-regions-*.rs for the tests that
|
|
// check that the variance inference works in the first place.
|
|
|
|
// This is covariant with respect to 'a, meaning that
|
|
// Covariant<'foo> <: Covariant<'static> because
|
|
// 'foo <= 'static
|
|
//@ pretty-expanded FIXME #23616
|
|
|
|
struct Covariant<'a> {
|
|
f: extern "Rust" fn(&'a isize)
|
|
}
|
|
|
|
fn use_<'a>(c: Covariant<'a>) {
|
|
// OK Because Covariant<'a> <: Covariant<'static> iff 'a <= 'static
|
|
let _: Covariant<'static> = c;
|
|
}
|
|
|
|
pub fn main() {}
|