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     Compiler error C2621
 
     union 'union' : member 'identifier' has a copy constructor
 
     The specified union member was declared with a copy constructor.
 
     A union member is not allowed to have a copy constructor.
 
     The following is an example of this error:
 
          class A
          {
             A( const A& );  // A has a copy constructor
          };
 
          union U
          {
             A a;            // error
          };
                                    -♦-