==== tests/cases/compiler/overloadOnConstInCallback1.ts (1 errors) ====
    class C {
        x1(a: number, callback: (x: 'hi') => number); // error
                                ~~~~~~~~~~~~~~~~~~~
!!! Specialized overload signature is not assignable to any non-specialized signature.
        x1(a: number, callback: (x: any) => number) {
            callback('hi');
            callback('bye');
            var hm = "hm";
            callback(hm);
        }
    }