rust/tests/ui/variance/variance-use-covariant-struct-2.rs
2024-02-16 20:02:50 +00:00

17 lines
321 B
Rust

// Test that a covariant struct permits the lifetime of a reference to
// be shortened.
#![allow(dead_code)]
//@ build-pass (FIXME(62277): could be check-pass?)
struct SomeStruct<T>(T);
fn foo<'min,'max>(v: SomeStruct<&'max ()>)
-> SomeStruct<&'min ()>
where 'max : 'min
{
v
}
fn main() { }