src/test/run-pass/trait-inheritance-auto.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 // Testing that this impl turns A into a Quux, because
  12 // A is already a Foo Bar Baz
  13 // pretty-expanded FIXME #23616
  14
  15 impl<T:Foo + Bar + Baz> Quux for T { }
  16
  17 trait Foo { fn f(&self) -> isize; }
  18 trait Bar { fn g(&self) -> isize; }
  19 trait Baz { fn h(&self) -> isize; }
  20
  21 trait Quux: Foo + Bar + Baz { }
  22
  23 struct A { x: isize }
  24
  25 impl Foo for A { fn f(&self) -> isize { 10 } }
  26 impl Bar for A { fn g(&self) -> isize { 20 } }
  27 impl Baz for A { fn h(&self) -> isize { 30 } }
  28
  29 fn f<T:Quux>(a: &T) {
  30     assert_eq!(a.f(), 10);
  31     assert_eq!(a.g(), 20);
  32     assert_eq!(a.h(), 30);
  33 }
  34
  35 pub fn main() {
  36     let a = &A { x: 3 };
  37     f(a);
  38 }