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.
| • Catch and Throw: | Nonlocal exits for the program’s own purposes. | |
| • Examples of Catch: | Showing how such nonlocal exits can be written. | |
| • Errors: | How errors are signaled and handled. | |
| • Cleanups: | Arranging to run a cleanup form if an error happens. |
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https://www.gnu.org/software/emacs/manual/html_node/elisp/Nonlocal-Exits.html