(lispref.info)Error Messages

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Error Messages

   Some examples cause errors to be signaled.  In them, the error
message (which always appears in the echo area) is shown on a line
starting with `error-->'.  Note that `error-->' itself does not appear
in the echo area.

     (+ 23 'x)
     error--> Wrong type argument: integer-or-marker-p, x

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