From: Mattias Engdegård <mattiase@acm.org>
Date: Fri, 17 Jun 2022 08:32:54 +0000 (+0200)
Subject: * src/fns.c (Fmapconcat): Better empty-string-or-nil detection.
X-Git-Tag: emacs-29.0.90~1447^2~1691
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=39826148d62d88906bea80c310a316312d5e681c;p=emacs.git

* src/fns.c (Fmapconcat): Better empty-string-or-nil detection.
---

diff --git a/src/fns.c b/src/fns.c
index a6ceac29355..4a9954ce903 100644
--- a/src/fns.c
+++ b/src/fns.c
@@ -2836,7 +2836,7 @@ FUNCTION must be a function of one argument, and must return a value
   ptrdiff_t nargs = 2 * nmapped - 1;
   eassert (nmapped == leni);
 
-  if (!NILP (Fequal (separator, empty_multibyte_string)))
+  if (NILP (separator) || (STRINGP (separator) && SCHARS (separator) == 0))
     nargs = nmapped;
   else
     {