From: Mattias Engdegård <mattiase@acm.org>
Date: Sat, 20 May 2023 08:50:25 +0000 (+0200)
Subject: * etc/NEWS: Note dotimes loop variable scoping change (bug#63586)
X-Git-Tag: emacs-29.0.92~127
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=f49fe936abd48f7458596893d25e3300f59508be;p=emacs.git

* etc/NEWS: Note dotimes loop variable scoping change (bug#63586)
---

diff --git a/etc/NEWS b/etc/NEWS
index fa428d9c790..cdad1796e77 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -3871,6 +3871,19 @@ The following generalized variables have been made obsolete:
 'standard-case-table', 'syntax-table', 'visited-file-modtime',
 'window-height', 'window-width', and 'x-get-secondary-selection'.
 
+---
+** The 'dotimes' loop variable can no longer be manipulated in loop body
+Previously, the 'dotimes' loop counter could be modified inside the
+loop body, but only in code using dynamic binding.  Now the behaviour
+is the same as when using lexical binding: changes to the loop
+variable has no effect on subsequent iterations.  That is,
+
+    (dotimes (i 10)
+      (print i)
+      (setq i (+ i 6)))
+
+now always prints the numbers 0 .. 9.
+
 
 * Lisp Changes in Emacs 29.1