From 1f5a7f2f4970144164232a2bc45f561de5d65c33 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Fri, 4 Oct 2019 16:02:50 +0900
Subject: Freeze strings from `nil.to_s`, `true.to_s`, `false.to_s`.

This is an experimental changes in Ruby 2.7.
---
 src/string.c | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'src/string.c')

diff --git a/src/string.c b/src/string.c
index 1428ea780..328366e10 100644
--- a/src/string.c
+++ b/src/string.c
@@ -235,6 +235,13 @@ mrb_str_new_static(mrb_state *mrb, const char *p, size_t len)
   return mrb_obj_value(s);
 }
 
+MRB_API mrb_value
+mrb_str_freeze(mrb_state *mrb, const char *p, size_t len)
+{
+  struct RString *s = str_new_static(mrb, p, len);
+  return mrb_obj_value(s);
+}
+
 static void
 str_decref(mrb_state *mrb, mrb_shared_string *shared)
 {
-- 
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