.. hook:: H_NOTIFY_FAIL

  :arg string value: <msg>
  :arg closure value: string <closure>(string entered_command, object cmd_giver)

  Mandatory hook to issue the default message if an entered command couldn't be parsed and no :efun:`notify_fail` command is in effect. Hook setting can be a any closure, or a string.

  If set to a string, it is the message returned to the player.

  If set to a closure, it is called with the command and the command giver as arguments, and the result is used as failure message. Lambda closures are bound to ``this_player()`` prior to execution.

  <cmd_giver> is the object which received the command in the first place. It is usually identical with ``this_player()``, unless the :hook:`H_MODIFY_COMMAND` hook changed it.

  :history 3.2.7 changed: added the new 'command_giver' argument.

  .. seealso:: :overview:`hook`, :hook:`command`, :hook:`modify_command`, :hook:`modify_command_fname`, :hook:`send_notify_fail`