GNU bug report logs - #17662
24.3; Newly created variable has a value in it.

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From: James McClain <jamezmcclain <at> gmail.com>
To: 17662 <at> debbugs.gnu.org
Subject: bug#17662: 24.3; Newly created variable has a value in it.
Date: Sun, 1 Jun 2014 12:28:47 -0700

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The variable "bins" has a value in it the second time the function is run.
It should be equal to ( () ).
I assume this has to do with me use of setcar.
(setq items '(1 3 4 5 3 2 9 8 5 10 2 3 1))
(defun greedy-binpacking (items size)
  (sort items '<)
  (let ((bins '( () ) ))
    (while items
      (let ((tmpbins bins)
    (item (pop items)))
 (while tmpbins
  (if (>= (+ (apply '+ (car tmpbins)) item) 10)
      (progn (setq tmpbins (cdr tmpbins))
     (unless tmpbins
       (setq bins
     (append bins `((,item))))
       (setq tmpbins '())))
    (setcar tmpbins
    (cons item (car tmpbins)))
    (setq tmpbins '())))))
    bins))
(greedy-binpacking items 10) --> ((3 2 2 1 1) (3 3) (5 4) (5) (8) (9) (10))
(greedy-binpacking items 10) --> ((3 2 2 1 1) (3 2 2 1 1) (3 3) (5 4) (5)
(8) (9) (10))
(greedy-binpacking items 10) --> ((3 2 2 1 1) (3 2 2 1 1) (3 3) (5 4) (5)
(8) (9) (10))
(greedy-binpacking items 10) --> ((3 2 2 1 1) (3 2 2 1 1) (3 3) (5 4)
(5) (8) (9) (10))



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