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master ba918ec: Improve directory-append manual entry

From: Lars Ingebrigtsen
Subject: master ba918ec: Improve directory-append manual entry
Date: Sat, 24 Jul 2021 12:06:44 -0400 (EDT)

branch: master
commit ba918ecb7891c6d0bb7bbaab93b4316881166d94
Author: Lars Ingebrigtsen <larsi@gnus.org>
Commit: Lars Ingebrigtsen <larsi@gnus.org>

    Improve directory-append manual entry
    * doc/lispref/files.texi (Directory Names): Mention zero-length
 doc/lispref/files.texi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/doc/lispref/files.texi b/doc/lispref/files.texi
index a624c2e..804cef2 100644
--- a/doc/lispref/files.texi
+++ b/doc/lispref/files.texi
@@ -2355,6 +2355,8 @@ didn't end with a slash.
 @end group
 @end example
+A zero-length directory or component is not allowed.
 This is almost the same as using @code{concat}, but @var{dirname} (and
 the non-final components) may or may not end with slash characters,
 and this function will not double those characters.

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