25 lines
886 B
Rust
25 lines
886 B
Rust
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// Copyright 2014 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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// Test an edge case in region inference: the lifetime of the borrow
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// of `*x` must be extended to at least 'a.
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fn foo<'a,'b>(x: &'a &'b mut int) -> &'a int {
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let y = &*x; // should be inferred to have type &'a &'b mut int...
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// ...because if we inferred, say, &'x &'b mut int where 'x <= 'a,
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// this reborrow would be illegal:
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&**y
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}
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pub fn main() {
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/* Just want to know that it compiles. */
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}
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