36 lines
1.0 KiB
Rust
36 lines
1.0 KiB
Rust
|
// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
|
||
|
|
// file at the top-level directory of this distribution and at
|
||
|
|
// http://rust-lang.org/COPYRIGHT.
|
||
|
|
//
|
||
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
||
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
||
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
||
|
|
// option. This file may not be copied, modified, or distributed
|
||
|
|
// except according to those terms.
|
||
|
|
|
||
|
|
// Tests that binary operators allow subtyping on both the LHS and RHS,
|
||
|
|
// and as such do not introduce unnecesarily 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() {
|
||
|
|
}
|