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Allegro CL
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  6 Iteration   6.1 The LOOP Facility   6.1.2 Variable Initialization and Stepping Clauses Iteration Control The for-as-in-list subclause

In the for-as-in-list subclause, the for or as construct iterates over the contents of a list. It checks for the end of the list as if by using endp. The variable var is bound to the successive elements of the list in form1 before each iteration. At the end of each iteration, the function step-fun is applied to the list; the default value for step-fun is cdr. The loop keywords in and by serve as valid prepositions in this syntax. The for or as construct causes termination when the end of the list is reached.  Examples of for-as-in-list subclause

See cl:loop and the for-as-in-sequnce subclause for looping over sequences for a description of the additional for-as-in-sequence clause in Allegro CL.

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