-#![feature(const_fn_fn_ptr_basics)]
-
const fn foo() { (||{})() }
//~^ ERROR cannot call non-const closure
+//~| ERROR erroneous constant used [const_err]
+//~| WARNING this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
const fn bad(input: fn()) {
input()