tests/ui/pattern/issue-94866.rs - toolchain/rustc - Git at Google

 macro_rules! m {
     () => {
         {}
     };
 }

 enum Enum { A, B }

 fn main() {
     match Enum::A {
     //~^ ERROR non-exhaustive patterns
     Enum::A => m!()
     }
 }
	macro_rules! m {
	() => {
	{}
	};
	}

	enum Enum { A, B }

	fn main() {
	match Enum::A {
	//~^ ERROR non-exhaustive patterns
	Enum::A => m!()
	}
	}