42 lines
1.4 KiB
Rust
42 lines
1.4 KiB
Rust
// Copyright 2012-2014 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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// The regression test for #15031 to make sure destructuring trait
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// reference work properly.
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trait T {}
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impl T for int {}
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fn main() {
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// For an expression of the form:
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//
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// let &...&x = &..&SomeTrait;
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//
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// Say we have n `&` at the left hand and m `&` right hand, then:
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// if n < m, we are golden;
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// if n == m, it's a derefing non-derefable type error;
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// if n > m, it's a type mismatch error.
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// n < m
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let &x = &(&1 as &T);
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let &x = &&(&1 as &T);
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let &&x = &&(&1 as &T);
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// n == m
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let &x = &1 as &T; //~ ERROR cannot be dereferenced
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let &&x = &(&1 as &T); //~ ERROR cannot be dereferenced
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let box x = box 1 as Box<T>; //~ ERROR cannot be dereferenced
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// n > m
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let &&x = &1 as &T; //~ ERROR found an `&`-pointer pattern
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let &&&x = &(&1 as &T); //~ ERROR found an `&`-pointer pattern
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let box box x = box 1 as Box<T>; //~ ERROR found a box pattern
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}
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