From 708088c5fafd469d04a1b428fc49b8b7c27607d2 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Mon, 23 Jan 2017 10:52:40 +0900
Subject: Should not make empty strings shared; fix #3407

---
 src/string.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/string.c b/src/string.c
index d6bdd6975..02c7ce426 100644
--- a/src/string.c
+++ b/src/string.c
@@ -423,7 +423,7 @@ byte_subseq(mrb_state *mrb, mrb_value str, mrb_int beg, mrb_int len)
   mrb_shared_string *shared;
 
   orig = mrb_str_ptr(str);
-  if (RSTR_EMBED_P(orig)) {
+  if (RSTR_EMBED_P(orig) || RSTR_LEN(orig) == 0) {
     s = str_new(mrb, orig->as.ary+beg, len);
   }
   else {
-- 
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