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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-across subclause

In the for-as-across subclause the for or as construct binds the variable var to the value of each element in the array vector. The loop keyword across marks the array vector; across is used as a preposition in this syntax. Iteration stops when there are no more elements in the supplied array that can be referenced. Some implementations might recognize a the special form in the vector form to produce more efficient code.  Examples of for-as-across 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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