==== tests/cases/compiler/overloadOnConstNoAnyImplementation.ts (4 errors) ====
    function x1(a: number, cb: (x: 'hi') => number);
                               ~~~~~~~~~~~~~~~~~~~
!!! Specialized overload signature is not assignable to any non-specialized signature.
    function x1(a: number, cb: (x: 'bye') => number);
                               ~~~~~~~~~~~~~~~~~~~~
!!! Specialized overload signature is not assignable to any non-specialized signature.
    function x1(a: number, cb: (x: string) => number) {
        cb('hi');
        cb('bye');
        var hm = 'hm';
        cb(hm);
        cb('uh');
        cb(1); // error
           ~
!!! Argument of type 'number' is not assignable to parameter of type 'string'.
    }
    
    var cb: (number) => number = (x: number) => 1;
    x1(1, cb);
    x1(1, (x: 'hi') => 1); // error
          ~~~~~~~~~~~~~~
!!! A signature with an implementation cannot use a string literal type.
    x1(1, (x: string) => 1);