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

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Package: emacs;

Reported by: JD Smith <jdtsmith <at> gmail.com>

Date: Thu, 23 Feb 2023 22:46:02 UTC

Severity: normal

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Report forwarded to bug-gnu-emacs <at> gnu.org:
bug#61743; Package emacs. (Thu, 23 Feb 2023 22:46:02 GMT) Full text and rfc822 format available.
Acknowledgement sent to JD Smith <jdtsmith <at> gmail.com>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs <at> gnu.org. (Thu, 23 Feb 2023 22:46:02 GMT) Full text and rfc822 format available.

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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
This bug report was last modified 1 year and 277 days ago.

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