36 lines
982 B
Rust
36 lines
982 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 that the `'a` in the where clause correctly links the region
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// of the output to the region of the input.
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trait FnLike<A,R> {
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fn call(&self, arg: A) -> R;
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}
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fn call_repeatedly<F>(f: F)
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where F : for<'a> FnLike<&'a int, &'a int>
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{
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// Result is stored: cannot re-assign `x`
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let mut x = 3;
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let y = f.call(&x);
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x = 5; //~ ERROR cannot assign
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// Result is not stored: can re-assign `x`
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let mut x = 3;
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f.call(&x);
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f.call(&x);
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f.call(&x);
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x = 5;
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}
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fn main() {
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}
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