src/test/run-pass/trait-inheritance-cross-trait-call.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 trait Foo { fn f(&self) -> isize; }
  13 trait Bar : Foo { fn g(&self) -> isize; }
  14
  15 struct A { x: isize }
  16
  17 impl Foo for A { fn f(&self) -> isize { 10 } }
  18
  19 impl Bar for A {
  20     // Testing that this impl can call the impl of Foo
  21     fn g(&self) -> isize { self.f() }
  22 }
  23
  24 pub fn main() {
  25     let a = &A { x: 3 };
  26     assert_eq!(a.g(), 10);
  27 }