From 10bb7ad693e7c7443de924a39c1fedb4461108ba Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@gmail.com>
Date: Sun, 11 Dec 2016 01:45:38 +0900
Subject: Implement Object#freeze

---
 src/array.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/array.c')

diff --git a/src/array.c b/src/array.c
index f6599bd5b..c6bac7b47 100644
--- a/src/array.c
+++ b/src/array.c
@@ -108,6 +108,10 @@ ary_fill_with_nil(mrb_value *ptr, mrb_int size)
 static void
 ary_modify(mrb_state *mrb, struct RArray *a)
 {
+  if (RBASIC_FROZEN_P(a)) {
+    mrb_raise(mrb, E_RUNTIME_ERROR, "can't modify frozen array");
+  }
+
   if (ARY_SHARED_P(a)) {
     mrb_shared_array *shared = a->aux.shared;
 
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