rust/tests/ui/regions/regions-early-bound-used-in-bound.rs
2024-02-16 20:02:50 +00:00

29 lines
499 B
Rust

//@ run-pass
// Tests that you can use a fn lifetime parameter as part of
// the value for a type parameter in a bound.
trait GetRef<'a, T> {
fn get(&self) -> &'a T;
}
#[derive(Copy, Clone)]
struct Box<'a, T:'a> {
t: &'a T
}
impl<'a,T:Clone> GetRef<'a,T> for Box<'a,T> {
fn get(&self) -> &'a T {
self.t
}
}
fn add<'a,G:GetRef<'a, isize>>(g1: G, g2: G) -> isize {
*g1.get() + *g2.get()
}
pub fn main() {
let b1 = Box { t: &3 };
assert_eq!(add(b1, b1), 6);
}