mirror of https://github.com/rust-lang/rust
29 lines
648 B
Rust
29 lines
648 B
Rust
//@ run-pass
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#![allow(dead_code)]
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#![allow(unused_variables)]
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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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