36 lines
1.0 KiB
Rust
36 lines
1.0 KiB
Rust
// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Tests that binary operators allow subtyping on both the LHS and RHS,
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// and as such do not introduce unnecessarily strict lifetime constraints.
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use std::ops::Add;
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struct Foo;
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impl<'a> Add<&'a Foo> for &'a Foo {
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type Output = ();
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fn add(self, rhs: &'a Foo) {}
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}
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fn try_to_add(input: &Foo) {
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let local = Foo;
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// Manual reborrow worked even with invariant trait search.
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&*input + &local;
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// Direct use of the reference on the LHS requires additional
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// subtyping before searching (invariantly) for `LHS: Add<RHS>`.
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input + &local;
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}
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fn main() {
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}
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