From 9d30ef596c3b6830cbb19bf00dd8072f43c3014d Mon Sep 17 00:00:00 2001
From: ko1 <ko1@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Fri, 18 Dec 2015 08:24:29 +0000
Subject: [PATCH] * compile.c (ibf_load_object_string): use fstring if frozen
 string.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53191 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog | 4 ++++
 compile.c | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 8b3224034e..d57dbcc744 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Dec 18 17:24:09 2015  Koichi Sasada  <ko1@atdot.net>
+
+	* compile.c (ibf_load_object_string): use fstring if frozen string.
+
 Fri Dec 18 16:54:38 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* ext/stringio/stringio.c (strio_set_encoding): add StringIO's own
diff --git a/compile.c b/compile.c
index f858fbb681..ed6f9686cf 100644
--- a/compile.c
+++ b/compile.c
@@ -7650,7 +7650,7 @@ ibf_load_object_string(const struct ibf_load *load, const struct ibf_object_head
     rb_enc_associate_index(str, encindex);
 
     if (header->internal) rb_obj_hide(str);
-    if (header->frozen)   rb_obj_freeze(str);
+    if (header->frozen)   str = rb_fstring(str);
 
     return str;
 }