MSIR.0875 Implements method inconsistent with base method

A method in an extension class was specified with the Implements keyword, indicating that it Implements a method in a base class, but the method signature (parameters, parameter types, parameter names, result type) in the extension class was different from the implemented method in the base class. An implementing method's parameters and results must be identical to those of the implemented base class method (except possibly for the method name, itself).