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A non-local exit is a transfer of control from the current point
of evaluation to a different point (somewhat similar to the
much-maligned goto statement in imperative languages).
Non-local exits can either be used explicitly (catch and
throw) or implicitly (errors).
| • Catch and Throw: | Programmed non-local exits | |
| • Function Exits: | Returning values from a function | |
| • Cleanup Forms: | Forms which will always be evaluated | |
| • Errors: | Signalling that an error occurred |