method_missing

# File lib/ostruct.rb, line 181
  def method_missing(mid, *args) # :nodoc:
    mname = mid.id2name
    len = args.length
    if mname.chomp!('=')
      if len != 1
        raise ArgumentError, "wrong number of arguments (#{len} for 1)", caller(1)
      end
      modifiable[new_ostruct_member(mname)] = args[0]
    elsif len == 0
      @table[mid]
    else
      err = NoMethodError.new "undefined method `#{mid}' for #{self}", mid, args
      err.set_backtrace caller(1)
      raise err
    end
  end