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6.1.2.1.2.1 Examples of for-as-in-list subclause
 
 
;; Print every item in a list.
 (loop for item in '(1 2 3) do (print item))
>>  1
>>  2
>>  3
=>  NIL
 
;; Print every other item in a list.
 (loop for item in '(1 2 3 4 5) by #'cddr
       do (print item))
>>  1
>>  3
>>  5
=>  NIL
 
;; Destructure a list, and sum the x values using fixnum arithmetic.
 (loop for (item . x) of-type (t . fixnum) in '((A . 1) (B . 2) (C . 3))
       unless (eq item 'B) sum x)
=>  4
  
The following X3J13 cleanup issue, not part of the specification, applies to this section:
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