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Showing content from https://www.gnu.org/software/emacs/manual/html_node/elisp/Error-Messages.html below:

Error Messages (GNU Emacs Lisp Reference Manual)

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1.3.5 Error Messages

Some examples signal errors. This normally displays an error message in the echo area. We show the error message on a line starting with ‘error→’. Note that ‘error→’ itself does not appear in the echo area.

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

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