src/test/run-pass/tag.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
  12
  13 enum colour { red(isize, isize), green, }
  14
  15 impl PartialEq for colour {
  16     fn eq(&self, other: &colour) -> bool {
  17         match *self {
  18             colour::red(a0, b0) => {
  19                 match (*other) {
  20                     colour::red(a1, b1) => a0 == a1 && b0 == b1,
  21                     colour::green => false,
  22                 }
  23             }
  24             colour::green => {
  25                 match (*other) {
  26                     colour::red(..) => false,
  27                     colour::green => true
  28                 }
  29             }
  30         }
  31     }
  32     fn ne(&self, other: &colour) -> bool { !(*self).eq(other) }
  33 }
  34
  35 fn f() { let x = colour::red(1, 2); let y = colour::green; assert!((x != y)); }
  36
  37 pub fn main() { f(); }