loopmacro in that it allows you to use defined loop keywords to control the parameters of the iteration.
Loop keywords are not true Common Lisp keywords; they are symbols that are recognized by the Loop Facility and that provide such capabilities as controlling the direction of iteration, accumulating values inside the body of a loop, and evaluating expressions that precede or follow the loop body. If you do not use any loop keywords, the Loop Facility is identical to the Common Lisp
loop macro; that is, it executes the loop body repeatedly. Thus, the Loop Facility is an upward-compatible extension to the Common Lisp
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