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(librep.info)Non-Local Exits

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Non-Local Exits
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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