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 `@error{}' (error-->): Indicating an Error Message
 --------------------------------------------------
 
   A piece of code may cause an error when you evaluate it.  You can
 designate the error message with the `@error{}' command.
 
   The `@error{}' command is displayed as `error-->' in Info and as the
 word `error' in a box in the printed output.
 
   Thus,
 
      @lisp
      (+ 23 'x)
      @error{} Wrong type argument: integer-or-marker-p, x
      @end lisp
 
 produces
 
      (+ 23 'x)
      error--> Wrong type argument: integer-or-marker-p, x
 
 This indicates that the following error message is printed when you
 evaluate the expression:
 
      Wrong type argument: integer-or-marker-p, x
 
   `error-->' itself is not part of the error message.
 

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