src/test/run-pass/coherence-where-clause.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 use std::fmt::Debug;
  12 use std::default::Default;
  13
  14 trait MyTrait {
  15     fn get(&self) -> Self;
  16 }
  17
  18 impl<T> MyTrait for T
  19     where T : Default
  20 {
  21     fn get(&self) -> T {
  22         Default::default()
  23     }
  24 }
  25
  26 #[derive(Clone, Copy, Debug, PartialEq)]
  27 struct MyType {
  28     dummy: uint
  29 }
  30
  31 impl MyTrait for MyType {
  32     fn get(&self) -> MyType { (*self).clone() }
  33 }
  34
  35 fn test_eq<M>(m: M, n: M)
  36 where M : MyTrait + Debug + PartialEq
  37 {
  38     assert_eq!(m.get(), n);
  39 }
  40
  41 pub fn main() {
  42     test_eq(0_usize, 0_usize);
  43
  44     let value = MyType { dummy: 256 + 22 };
  45     test_eq(value, value);
  46 }