GNU bug report logs - #61743
cl-loop's "being the intervals of" does not let-bind var

Previous Next

Full log

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: JD Smith <jdtsmith <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: cl-loop's "being the intervals of" does not let-bind var
Date: Thu, 23 Feb 2023 17:44:51 -0500

Macro-expanding the following reveals that the “being the intervals” cl-loop construct fails to let-bind the loop var (i here):

  (cl-loop for i being the intervals of x do (ignore))

expanding to:

(cl-block nil
  (cl-block --cl-finish--
    (cl--map-intervals
     (lambda
       (--cl-var1-- --cl-var2--)
       (setq i
	     (cons --cl-var1-- --cl-var2--))
       (ignore))
     x nil nil nil))
  nil)

This leads to the loop altering global variables.  Emacs v28.2

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.