class OpenStruct

def method_missing(mid, *args) # :nodoc:
  len = args.length
  if mname = mid[/.*(?==\z)/m]
    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 # and /\A[a-z_]\w*\z/ =~ mid #
    if @table.key?(mid)
      new_ostruct_member!(mid) unless frozen?
      @table[mid]
    end
  else
    begin
      super
    rescue NoMethodError => err
      err.backtrace.shift
      raise
    end
  end
end