rust/tests/ui/variance/variance-use-contravariant-struct-1.rs
2023-01-11 09:32:08 +00:00

16 lines
339 B
Rust

// Test various uses of structs with distinct variances to make sure
// they permit lifetimes to be approximated as expected.
struct SomeStruct<T>(fn(T));
fn foo<'min,'max>(v: SomeStruct<&'max ()>)
-> SomeStruct<&'min ()>
where 'max : 'min
{
v
//~^ ERROR lifetime may not live long enough
}
fn main() { }