tests/ui/error-codes/E0599.rs - third_party/rust - Git at Google

 struct Foo;

 fn main() {
     || if let Foo::NotEvenReal() = Foo {}; //~ ERROR E0599
 }
	struct Foo;

	fn main() {
	\|\| if let Foo::NotEvenReal() = Foo {}; //~ ERROR E0599
	}