31 lines
1.0 KiB
Rust
31 lines
1.0 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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// revisions: ast mir
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//[mir]compile-flags: -Z borrowck=mir
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fn main() {
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let foo = &mut 1;
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let &mut x = foo;
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x += 1; //[ast]~ ERROR cannot assign twice to immutable variable
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//[mir]~^ ERROR cannot assign twice to immutable variable `x`
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// explicitly mut-ify internals
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let &mut mut x = foo;
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x += 1;
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// check borrowing is detected successfully
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let &mut ref x = foo;
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*foo += 1; //[ast]~ ERROR cannot assign to `*foo` because it is borrowed
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//[mir]~^ ERROR cannot assign to `*foo` because it is borrowed
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drop(x);
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}
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