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.
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.
11 // B and C both require A, so D does as well, twice, but that's just fine
13 trait A { fn a(&self) -> int; }
14 trait B: A { fn b(&self) -> int; }
15 trait C: A { fn c(&self) -> int; }
16 trait D: B + C { fn d(&self) -> int; }
18 struct S { bogus: () }
20 impl A for S { fn a(&self) -> int { 10 } }
21 impl B for S { fn b(&self) -> int { 20 } }
22 impl C for S { fn c(&self) -> int { 30 } }
23 impl D for S { fn d(&self) -> int { 40 } }
26 assert_eq!(x.a(), 10);
27 assert_eq!(x.b(), 20);
28 assert_eq!(x.c(), 30);
29 assert_eq!(x.d(), 40);
33 let value = &S { bogus: () };