src/test/run-pass/newtype-temporary.rs - third_party/rust - Git at Google

 #[derive(PartialEq, Debug)]
 struct Foo(usize);

 fn foo() -> Foo {
     Foo(42)
 }

 pub fn main() {
     assert_eq!(foo(), Foo(42));
 }
	#[derive(PartialEq, Debug)]
	struct Foo(usize);

	fn foo() -> Foo {
	Foo(42)
	}

	pub fn main() {
	assert_eq!(foo(), Foo(42));
	}