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6 Iteration  6.1 The LOOP Facility 6.1.1 Overview of the Loop Facility 6.1.1.1 Simple vs Extended Loop
6.1.1.1.1 Simple Loop
A simple loop form is one that has a body containing
only compound forms.
Each form is evaluated in turn from left to right.
When the last form has been evaluated,
then the first form is evaluated again, and so on, in a never-ending cycle.
A simple loop form establishes an implicit block named nil.
The execution of a simple loop can be terminated by explicitly
transfering control to the implicit block (using return or
return-from) or to some exit point outside of the block
(e.g., using throw, go, or return-from).
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