From 7ad56fd87b35abf4933e0146761df91e9ec9890a Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@atdot.net>
Date: Tue, 20 Oct 2020 15:16:21 +0900
Subject: freeze dynamic regexp literals

Regexp literals are frozen, and also dynamically comppiled Regexp
literals (/#{expr}/) are frozen.
---
 re.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 're.c')

diff --git a/re.c b/re.c
index 020ba7b6d6..55b39bfdea 100644
--- a/re.c
+++ b/re.c
@@ -2944,7 +2944,9 @@ rb_reg_init_str_enc(VALUE re, VALUE s, rb_encoding *enc, int options)
 MJIT_FUNC_EXPORTED VALUE
 rb_reg_new_ary(VALUE ary, int opt)
 {
-    return rb_reg_new_str(rb_reg_preprocess_dregexp(ary, opt), opt);
+    VALUE re = rb_reg_new_str(rb_reg_preprocess_dregexp(ary, opt), opt);
+    rb_obj_freeze(re);
+    return re;
 }
 
 VALUE
-- 
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