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     Compiler error C2505
 
     'identifier' : is not a legal base class
 
     The specified identifier was not a class (or structure) but was
     used to derive a class.
 
     A class can be derived only from classes. This error can be
     caused by naming a variable or type in the base class list.
 
     The following is an example of this error:
 
          class B { };
          class D : public B { };  // OK, D is derived from B
 
          typedef int I;
          class E : public I { };  //  error, I is not a class
                                    -♦-