# File lib/parser/ruby21.rb, line 4915
def _reduce_318(val, _values, result)
                      if in_def?
                        diagnostic :error, :class_in_def, nil, val[0]
                      end

                      lt_t, superclass = val[2]
                      result = @builder.def_class(val[0], val[1],
                                                  lt_t, superclass,
                                                  val[4], val[5])

                      @lexer.pop_cmdarg
                      @static_env.unextend
                    
    result
end