(loop while (hungry-p) do (eat))
;; UNTIL NOT is equivalent to WHILE.
(loop until (not (hungry-p)) do (eat))
;; Collect the length and the items of STACK.
(let ((stack '(a b c d e f)))
(loop for item = (length stack) then (pop stack)
collect item
while stack))
=> (6 A B C D E F)
;; Use WHILE to terminate a loop that otherwise wouldn't terminate.
;; Note that WHILE occurs after the WHEN.
(loop for i fixnum from 3
when (oddp i) collect i
while (< i 5))
=> (3 5)
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