src/test/run-pass/eq-multidispatch.rs

   1 // Copyright 2014 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 #[derive(PartialEq)]
  12 struct Bar;
  13 struct Baz;
  14 struct Foo;
  15 struct Fu;
  16
  17 impl PartialEq for Baz { fn eq(&self, _: &Baz) -> bool  { true } }
  18
  19 impl PartialEq<Fu> for Foo { fn eq(&self, _: &Fu) -> bool { true } }
  20 impl PartialEq<Foo> for Fu { fn eq(&self, _: &Foo) -> bool { true } }
  21
  22 impl PartialEq<Bar> for Foo { fn eq(&self, _: &Bar) -> bool { false } }
  23 impl PartialEq<Foo> for Bar { fn eq(&self, _: &Foo) -> bool { false } }
  24
  25 fn main() {
  26     assert!(Bar != Foo);
  27     assert!(Foo != Bar);
  28
  29     assert!(Bar == Bar);
  30
  31     assert!(Baz == Baz);
  32
  33     assert!(Foo == Fu);
  34     assert!(Fu == Foo);
  35 }