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6.1.2.5 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