25 lines
851 B
Rust
25 lines
851 B
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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fn main() {
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let mut x: Option<isize> = None;
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match x {
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None => {
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// Note: on this branch, no borrow has occurred.
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x = Some(0);
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}
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Some(ref i) => {
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// But on this branch, `i` is an outstanding borrow
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x = Some(*i+1); //~ ERROR cannot assign to `x`
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}
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}
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x.clone(); // just to prevent liveness warnings
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}
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