mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-29 18:23:49 +00:00
29 lines
648 B
Rust
29 lines
648 B
Rust
//@ run-pass
|
|
#![allow(dead_code)]
|
|
#![allow(unused_variables)]
|
|
// Tests that binary operators allow subtyping on both the LHS and RHS,
|
|
// and as such do not introduce unnecessarily strict lifetime constraints.
|
|
|
|
use std::ops::Add;
|
|
|
|
struct Foo;
|
|
|
|
impl<'a> Add<&'a Foo> for &'a Foo {
|
|
type Output = ();
|
|
fn add(self, rhs: &'a Foo) {}
|
|
}
|
|
|
|
fn try_to_add(input: &Foo) {
|
|
let local = Foo;
|
|
|
|
// Manual reborrow worked even with invariant trait search.
|
|
&*input + &local;
|
|
|
|
// Direct use of the reference on the LHS requires additional
|
|
// subtyping before searching (invariantly) for `LHS: Add<RHS>`.
|
|
input + &local;
|
|
}
|
|
|
|
fn main() {
|
|
}
|