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(texinfo)Error Glyph

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`@error{}' (error-->): Indicating an Error Message
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  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.