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     Compiler error C2500
 
     'identifier1' : 'identifier2' is already a direct base class
 
     The specified class (or structure) appeared more than once in a
     list of base classes for a derived class.
 
     A class is called a direct base if it is mentioned in the base
     list.  A class is called an indirect base if it is not a direct
     base but is a base class of one of the classes mentioned in the
     base list.
 
     A class cannot be specifed as a direct base class more than once.
     A class can be used as an indirect base class more than once.
 
     The following is an example of this error:
 
          class A { };
          class B : public A, public A { };    // error
          class C : public A { };
          class D : public A { };
          class E : public C, public D { };    // OK, contains two As
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