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     Compiler error C2603
 
     illegal access declaration: 'class1' is not a direct base of
     'class2'
 
     The specified class or structure (class2) contained an access
     declaration for a member of a class or structure (class1) that
     was not a direct base.
 
     To change the access to a member of an indirect base class, use
     its qualified name in the public or protected part of the derived
     class declaration. The qualified name must specify a direct base
     class.
 
     The following is an example of this error:
 
          struct A
          {
             int a, a2;
          };
 
          struct B : A {};
 
          struct C : B
          {
             A::a2;  // error, A is not a direct base
             B::a;   // OK, qualified name specifies a direct base
          };
                                    -♦-