C/C++ Compiler (cl.hlp) (Table of Contents; Topic list)
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C2646
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     Compiler error C2646
 
     global anonymous unions must be declared static
 
     The anonymous union had global scope but was not declared as
     static.
 
     The following is an example of this error:
 
          union { int i; };         // error, not static
          static union { int j; };  // OK
          union U { int i; };       // OK, not anonymous
                                    -♦-