From 1164463a7c21699cfee2e0fb610ae9931b830cc0 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Mon, 12 Dec 2016 01:05:07 +0900
Subject: freeze classes/modules; ref #3340

---
 src/class.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'src')

diff --git a/src/class.c b/src/class.c
index e724dbb91..de68087cb 100644
--- a/src/class.c
+++ b/src/class.c
@@ -370,6 +370,12 @@ mrb_define_method_raw(mrb_state *mrb, struct RClass *c, mrb_sym mid, struct RPro
   MRB_CLASS_ORIGIN(c);
   h = c->mt;
 
+  if (MRB_FROZEN_P(c)) {
+    if (c->tt == MRB_TT_MODULE)
+      mrb_raise(mrb, E_RUNTIME_ERROR, "can't modify frozen module");
+    else
+      mrb_raise(mrb, E_RUNTIME_ERROR, "can't modify frozen class");
+  }
   if (!h) h = c->mt = kh_init(mt, mrb);
   k = kh_put(mt, mrb, h, mid);
   kh_value(h, k) = p;
-- 
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