40 lines
881 B
Rust
40 lines
881 B
Rust
// Copyright 2012 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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struct dtor {
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x: @mut int,
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}
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impl Drop for dtor {
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fn finalize(&self) {
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// abuse access to shared mutable state to write this code
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*self.x -= 1;
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}
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}
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fn unwrap<T>(+o: Option<T>) -> T {
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match o {
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Some(v) => v,
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None => fail!()
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}
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}
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pub fn main() {
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let x = @mut 1;
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{
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let b = Some(dtor { x:x });
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let c = unwrap(b);
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}
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assert *x == 0;
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}
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