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Showing content from https://www.lispworks.com/documentation/HyperSpec/Body/06_ah.htm below:

CLHS: Section 6.1.8

 (let ((i 0))                     ; no loop keywords are used
    (loop (incf i) (if (= i 3) (return i)))) =>  3
 (let ((i 0)(j 0))
    (tagbody
      (loop (incf j 3) (incf i) (if (= i 3) (go exit)))
      exit)
    j) =>  9

In the following example, the variable x is stepped before y is stepped; thus, the value of y reflects the updated value of x:

 (loop for x from 1 to 10 
       for y = nil then x 
       collect (list x y))
=>  ((1 NIL) (2 2) (3 3) (4 4) (5 5) (6 6) (7 7) (8 8) (9 9) (10 10))

In this example, x and y are stepped in parallel:

 (loop for x from 1 to 10 
       and y = nil then x 
       collect (list x y))
=>  ((1 NIL) (2 1) (3 2) (4 3) (5 4) (6 5) (7 6) (8 7) (9 8) (10 9))

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