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(elisp)Nonlocal Exits

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Nonlocal Exits
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   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.