tests/ui/deriving/deriving-via-extension-struct-empty.rs - toolchain/rustc - Git at Google

 //@ run-pass
 #[derive(PartialEq, Debug)]
 struct Foo;

 pub fn main() {
   assert_eq!(Foo, Foo);
   assert!(!(Foo != Foo));
 }
	//@ run-pass
	#[derive(PartialEq, Debug)]
	struct Foo;

	pub fn main() {
	assert_eq!(Foo, Foo);
	assert!(!(Foo != Foo));
	}