notify_fail

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          int notify_fail( string | function str );

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          Store `str' as the error message to be returned instead of
          the default message `What?'.  The message will be displayed
          if a 0 is returned from an action setup via add_action().
          This is the preferred way to display error messages since it
          allows other objects a chance to respond to the same verb
          (command).  Do not use write() to display the error message
          since this will require you to return a 1 (unless you want
          to see the result of the write() in addition to the 'What?'
          message).  However, if you do return a 1, then no other
          objects will get a chance to respond to the user command.

          If a function is passed instead of a string, the function is
          called instead of printing a message.  If the function
          returns a string, that string is used as the failure
          message.  Also, this_player() is set correctly, so write()
          can be used.

          If "notify_fail()" is called more than once, only the last
          call will have an effect.

          The idea behind this function is to allow better error
          messages than `What?'.

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          notify_fail() always returns 0.

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