tests/ui/return/dont-suggest-through-inner-const.rs - rust-lang/rust - Git at Google

 const fn f() -> usize {
     //~^ ERROR mismatched types
     const FIELD: usize = loop {
         0
         //~^ ERROR mismatched types
     };
 }

 fn main() {}
	const fn f() -> usize {
	//~^ ERROR mismatched types
	const FIELD: usize = loop {
	0
	//~^ ERROR mismatched types
	};
	}

	fn main() {}