src/test/run-fail/diverging-closure.rs - third_party/rust - Git at Google

 // error-pattern:oops

 fn main() {
     let func = || -> ! {
         panic!("oops");
     };
     func();
 }
	// error-pattern:oops

	fn main() {
	let func = \|\| -> ! {
	panic!("oops");
	};
	func();
	}