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Nonlocal Exits

A nonlocal exit is a transfer of control from one point in a program to another remote point. Nonlocal exits can occur in Emacs Lisp as a result of errors; you can also use them under explicit control. Nonlocal exits unbind all variable bindings made by the constructs being exited.

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Licensed under the GNU GPL license.
https://www.gnu.org/software/emacs/manual/html_node/elisp/Nonlocal-Exits.html