src/test/run-pass/traits/trait-inheritance-subst.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 // run-pass
  12
  13 pub trait Add<RHS,Result> {
  14     fn add(&self, rhs: &RHS) -> Result;
  15 }
  16
  17 trait MyNum : Sized + Add<Self,Self> { }
  18
  19 struct MyInt { val: isize }
  20
  21 impl Add<MyInt, MyInt> for MyInt {
  22     fn add(&self, other: &MyInt) -> MyInt { mi(self.val + other.val) }
  23 }
  24
  25 impl MyNum for MyInt {}
  26
  27 fn f<T:MyNum>(x: T, y: T) -> T {
  28     return x.add(&y);
  29 }
  30
  31 fn mi(v: isize) -> MyInt { MyInt { val: v } }
  32
  33 pub fn main() {
  34     let (x, y) = (mi(3), mi(5));
  35     let z = f(x, y);
  36     assert_eq!(z.val, 8)
  37 }