tests/ui/pattern/issue-74954.rs - third_party/rust - Git at Google

 //@ check-pass

 fn main() {
     if let Some([b'@', filename @ ..]) = Some(b"@abc123") {
         println!("filename {:?}", filename);
     }
 }
	//@ check-pass

	fn main() {
	if let Some([b'@', filename @ ..]) = Some(b"@abc123") {
	println!("filename {:?}", filename);
	}
	}