# File lib/mime/types.rb, line 605
605:     def add(*types)
606:       types.each do |mime_type|
607:         if @type_variants.include?(mime_type.simplified)
608:           if @type_variants[mime_type.simplified].include?(mime_type)
609:             warn "Type #{mime_type} already registered as a variant of #{mime_type.simplified}."
610:           end
611:         end
612:         add_type_variant(mime_type)
613:         index_extensions(mime_type)
614:       end
615:     end