From 09a66ceb5e906e704be58d5f40c45096307f0b9e Mon Sep 17 00:00:00 2001
From: Nicolas Petton <nicolas@petton.fr>
Date: Thu, 15 Dec 2016 10:24:57 +0100
Subject: Fix circular list handling in seq-mapn

* lisp/emacs-lisp/seq.el (seq-mapn): Do not copy list arguments.
* test/lisp/emacs-lisp/seq-tests.el (test-seq-mapn-circular-lists):
  Add a regression test.
---
 lisp/emacs-lisp/seq.el | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'lisp/emacs-lisp/seq.el')

diff --git a/lisp/emacs-lisp/seq.el b/lisp/emacs-lisp/seq.el
index 5ddc5a53a32..9890e60614e 100644
--- a/lisp/emacs-lisp/seq.el
+++ b/lisp/emacs-lisp/seq.el
@@ -178,7 +178,10 @@ Return a list of the results.
 
 \(fn FUNCTION SEQUENCES...)"
   (let ((result nil)
-        (sequences (seq-map (lambda (s) (seq-into s 'list))
+        (sequences (seq-map (lambda (s)
+                              (if (listp s)
+                                  s
+                                (seq-into s 'list)))
                             (cons sequence sequences))))
     (while (not (memq nil sequences))
       (push (apply function (seq-map #'car sequences)) result)
-- 
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