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   GNU Emacs Lisp Reference Manual
9.5: 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.
- 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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