src/test/run-pass/trait-inheritance-call-bound-inherited.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 trait Foo { fn f(&self) -> int; }
  12 trait Bar : Foo { fn g(&self) -> int; }
  13
  14 struct A { x: int }
  15
  16 impl Foo for A { fn f(&self) -> int { 10 } }
  17 impl Bar for A { fn g(&self) -> int { 20 } }
  18
  19 // Call a function on Foo, given a T: Bar
  20 fn gg<T:Bar>(a: &T) -> int {
  21     a.f()
  22 }
  23
  24 pub fn main() {
  25     let a = &A { x: 3 };
  26     assert_eq!(gg(a), 10);
  27 }