code: function _gpfAttributesCheckAppliedOnlyOnce (member, classDefinition, AttributeClass) {
      var attributes = _gpfAttributesCheckGetMemberAttributes(member, classDefinition, AttributeClass);
      if (_gpfArrayTail(attributes).length) {
          gpf.Error.uniqueAttributeUsedTwice();
      }
  }
docs: Ensures attribute is used only once
  
  @param {String} member Member name or empty if global to the class
  @param {_GpfClassDefinition} classDefinition Class definition
  @param {Function} AttributeClass Attribute class
  @throws {gpf.Error.UniqueAttributeUsedTwice}
  @since 0.2.8