(lispref.info)Nonlocal Exits

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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

* 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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