src/test/ui/impl-duplicate-methods.rs - third_party/rust - Git at Google

 struct Foo;

 impl Foo {
     fn orange(&self) {}
     fn orange(&self) {}
     //~^ ERROR duplicate definition
 }

 fn main() {}
	struct Foo;

	impl Foo {
	fn orange(&self) {}
	fn orange(&self) {}
	//~^ ERROR duplicate definition
	}

	fn main() {}