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

   1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 enum newtype {
  12     newtype(int)
  13 }
  14
  15 pub fn main() {
  16
  17     // Test that borrowck treats enums with a single variant
  18     // specially.
  19
  20     let x = @mut 5;
  21     let y = @mut newtype(3);
  22     let z = match *y {
  23       newtype(b) => {
  24         *x += 1;
  25         *x * b
  26       }
  27     };
  28     assert_eq!(z, 18);
  29 }