tests/cases/compiler/specializedSignatureAsCallbackParameter1.ts(7,4): error TS2345: Argument of type 'number' is not assignable to parameter of type 'string'.
tests/cases/compiler/specializedSignatureAsCallbackParameter1.ts(8,4): error TS2345: Argument of type 'number' is not assignable to parameter of type 'string'.
tests/cases/compiler/specializedSignatureAsCallbackParameter1.ts(8,7): error TS2381: A signature with an implementation cannot use a string literal type.