src/tools/miri/tests/pass/tuple_like_struct_constructor.rs - rust - Git at Google

 fn main() {
     #[derive(PartialEq, Eq, Debug)]
     struct A(i32);
     assert_eq!(Some(42).map(A), Some(A(42)));
 }
	fn main() {
	#[derive(PartialEq, Eq, Debug)]
	struct A(i32);
	assert_eq!(Some(42).map(A), Some(A(42)));
	}