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     Compiler error C2604
 
     cannot declare 'modifier' access to 'modifier' member
     'class::identifier'
 
     The access declaration of the given identifier specified an
     access that was different from the access declared in the base
     class or structure.
 
     An access declaration may not restrict access to a member that
     is accessible in a base class, nor may it grant more access to a
     member of the base class, beyond that which already it already
     has.
 
     The following example shows illegal access declarations:
 
          struct X
          {
          private:
              int priv;
          protected:
              int prot;
          public:
              int pub;
          };
 
          struct A : public X
          {
          protected:
             X::priv;    // error
             X::pub;     // error
          public:
             X::priv;    // error
             X::prot;    // error
          };
 
          struct B : protected X
          {
          protected:
             X::priv;    // error
             X::pub;     // error
          public:
             X::priv;    // error
             X::prot;    // error
          };
 
          struct C : private X
          {
          protected:
             X::priv;    // error
             X::pub;     // error
          public:
             X::priv;    // error
             X::prot;    // error
          };
                                    -♦-