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From: Ted Zlatanov <tzz@lifelogs.com>
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Subject: Re: Using CL in Gnus
Date: Mon, 01 Dec 2003 16:23:00 -0500
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mapc is used by gnus-registry.el thus:

(defun alist-to-hashtable (alist)
  "Build a hashtable from the values in ALIST."
  (let ((ht (make-hash-table                        
             :size 4096
             :test 'equal)))
    (mapc
     (lambda (kv-pair)
       (puthash (car kv-pair) (cdr kv-pair) ht))
     alist)
     ht))

This is trivial to switch to mapcar as far as I can see.  I only
wanted to emphasize that there is no return value.

Ted