tests/ui/consts/invalid-const-in-body.rs - third_party/github.com/rust-lang/rust - Git at Google

 fn f() -> impl Sized {
     2.0E
     //~^ ERROR expected at least one digit in exponent
 }

 fn main() {}
	fn f() -> impl Sized {
	2.0E
	//~^ ERROR expected at least one digit in exponent
	}

	fn main() {}