tests/ui/suggestions/suggest-box.fixed - rust-lang/rust - Git at Google

 //@ run-rustfix

 fn main() {
     let _x: Box<dyn Fn() -> Result<(), ()>> = Box::new(|| { //~ ERROR mismatched types
         Err(())?;
         Ok(())
     });
 }
	//@ run-rustfix

	fn main() {
	let _x: Box<dyn Fn() -> Result<(), ()>> = Box::new(\|\| { //~ ERROR mismatched types
	Err(())?;
	Ok(())
	});
	}