From 341feb3a26a0277f535217f4919b23eb70e3680e Mon Sep 17 00:00:00 2001
From: Lars Ingebrigtsen <larsi@gnus.org>
Date: Tue, 29 Dec 2015 00:07:50 +0100
Subject: [PATCH] Fix puny-encoding all-non-ASCII domains

* puny.el (puny-encode-string): Fix the all-non-ASCII encoding case.
---
 lisp/net/puny.el | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lisp/net/puny.el b/lisp/net/puny.el
index a16e3a07706..d96c6c22196 100644
--- a/lisp/net/puny.el
+++ b/lisp/net/puny.el
@@ -47,7 +47,11 @@ For instance, \"bücher\" => \"xn--bcher-kva\"."
                            string)))
     (if (= (length ascii) (length string))
         string
-      (concat "xn--" ascii "-" (puny-encode-complex (length ascii) string)))))
+      (concat "xn--"
+              (if (null ascii)
+                  ""
+                (concat ascii "-"))
+              (puny-encode-complex (length ascii) string)))))
 
 (defun puny-decode-domain (domain)
   "Decode DOMAIN according to the IDNA/punycode algorith.
-- 
2.39.5