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use to_str::ToStr; trait Foo { fn f(&self); } struct Bar { x: int } trait Baz { fn g(&self); } impl<T:Baz> T : Foo { fn f(&self) { self.g(); } } impl Bar : Baz { fn g(&self) { io::println(self.x.to_str()); } } fn main() { let y = Bar { x: 42 }; y.f(); }