code: def merge(self, other):
      
      if not isinstance(other, BuildFileAliases):
        raise TypeError('Can only merge other BuildFileAliases, given {0}'.format(other))
  
      def merge(*items):
        merged = {}
        for item in items:
          merged.update(item)
        return merged
  
      targets = merge(self.target_types, self.target_macro_factories,
                      other.target_types, other.target_macro_factories)
      objects = merge(self.objects, other.objects)
      context_aware_object_factories=merge(self.context_aware_object_factories,
                                           other.context_aware_object_factories)
      return BuildFileAliases(targets=targets,
                              objects=objects,
                              context_aware_object_factories=context_aware_object_factories)
docs: Merges a set of build file aliases and returns a new set of aliases containing both.
  
      Any duplicate aliases from `other` will trump.
  
      :API: public
  
      :param other: The BuildFileAliases to merge in.
      :type other: :class:`BuildFileAliases`
      :returns: A new BuildFileAliases containing `other`'s aliases merged into ours.
      :rtype: :class:`BuildFileAliases`