47 lines
1.2 KiB
Rust
47 lines
1.2 KiB
Rust
// Copyright 2015 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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// Regression test for #21726: an issue arose around the rules for
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// subtyping of projection types that resulted in an unconstrained
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// region, yielding region inference failures.
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// pretty-expanded FIXME #23616
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fn main() { }
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fn foo<'a>(s: &'a str) {
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let b: B<()> = B::new(s, ());
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b.get_short();
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}
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trait IntoRef<'a> {
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type T: Clone;
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fn into_ref(self, _: &'a str) -> Self::T;
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}
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impl<'a> IntoRef<'a> for () {
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type T = &'a str;
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fn into_ref(self, s: &'a str) -> &'a str {
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s
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}
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}
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struct B<'a, P: IntoRef<'a>>(P::T);
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impl<'a, P: IntoRef<'a>> B<'a, P> {
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fn new(s: &'a str, i: P) -> B<'a, P> {
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B(i.into_ref(s))
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}
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fn get_short(&self) -> P::T {
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self.0.clone()
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}
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}
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