==== tests/cases/compiler/specializedSignatureOverloadReturnTypeWithIndexers.ts (1 errors) ====
    interface A {
        f(p: string): { [p: string]: string; };
        f(p: "spec"): { [p: string]: any; } // Should be ok
    }
    interface B {
        f(p: string): { [p: number]: string; };
        f(p: "spec"): { [p: string]: any; } // Should be ok
    }
    interface C {
        f(p: string): { [p: number]: string; };
        f(p: "spec"): { [p: number]: any; } // Should be ok
    }
    interface D {
        f(p: string): { [p: string]: string; };
        f(p: "spec"): { [p: number]: any; } // Should be error
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!!! Specialized overload signature is not assignable to any non-specialized signature.
    }