rust/src/test/run-pass/borrowck-univariant-enum.rs

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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
enum newtype {
newtype(int)
}
pub fn main() {
// Test that borrowck treats enums with a single variant
// specially.
let x = @mut 5;
let y = @mut newtype(3);
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let z = match *y {
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newtype(b) => {
*x += 1;
*x * b
}
};
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assert!(z == 18);
}