// Copyright 2012 The Rust Project Developers. See the COPYRIGHT // file at the top-level directory of this distribution and at // http://rust-lang.org/COPYRIGHT. // // Licensed under the Apache License, Version 2.0 or the MIT license // , at your // option. This file may not be copied, modified, or distributed // except according to those terms. trait A { fn a(&self) -> int; } trait B: A { fn b(&self) -> int; } trait C: A { fn c(&self) -> int; } struct S { bogus: () } impl A for S { fn a(&self) -> int { 10 } } impl B for S { fn b(&self) -> int { 20 } } impl C for S { fn c(&self) -> int { 30 } } // Both B and C inherit from A fn f(x: &T) { assert_eq!(x.a(), 10); assert_eq!(x.b(), 20); assert_eq!(x.c(), 30); } pub fn main() { f(&S { bogus: () }) }