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     Compiler error C2590
 
     'identifier' : ambiguous user-defined conversions in switch
     expression
 
     The specified switch expression could not be converted to an
     integral type.
 
     An expression in a switch expression must unambiguously convert
     to an integral type.
 
     Ambiguous conversion can be caused when a conversion operator and
     a constructor making the same conversion have been defined.
                                    -♦-