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     Compiler error C2620
 
     union 'union' : member 'identifier' has default constructor
 
     The specified union member was declared with a default
     constructor.
 
     A union member is not allowed to have a default constructor.
 
     The following is an example of this error:
 
          class A
          {
             A();      // A has a default constructor
          };
 
          union U
          {
             A a;      // error
          };
                                    -♦-