tests/ui/const-generics/infer/cannot-infer-const-args.rs - third_party/github.com/rust-lang/rust - Git at Google

 fn foo<const X: usize>() -> usize {
     0
 }

 fn main() {
     foo(); //~ ERROR type annotations needed
 }
	fn foo<const X: usize>() -> usize {
	0
	}

	fn main() {
	foo(); //~ ERROR type annotations needed
	}