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trait Foo<T> { fn f(&self, x: &T); } trait Bar : Foo<self> { fn g(&self); } struct S { x: int } impl S : Foo<S> { fn f(&self, x: &S) { io::println(x.x.to_str()); } } impl S : Bar { fn g(&self) { self.f(self); } } fn main() { let s = S { x: 1 }; s.g(); }