anchor.diff:                value, 'value', 'No enum value with that value'));
       ''';
   
  -  String get _enumSetHelper => hasFlagsAttribute
  +  String get enumSetHelper => hasFlagsAttribute
         ? '''
       static Set<$enumName> createSetFrom(int value) => Set.unmodifiable(
         $enumName.values.where((e) => value & e.value == e.value));
  
positive.code:   String toString() => '''
          $classPreamble
          enum $_projectedName {
            $_fields
  
            $_enumVariable
  
  
negative.code: 
            $_factoryConstructor
  
            $enumSetHelper
          }
        ''';
  }
  