Non-Local Exits

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 some 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

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