From c3b79e11f37ce757bfd4d3715fb4ce3d31aa571d Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Sat, 13 Apr 2013 01:16:37 +0900
Subject: add no block check; based on patch from h2so5; close #1174

---
 src/kernel.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src')

diff --git a/src/kernel.c b/src/kernel.c
index 54c90dfc0..e578918af 100644
--- a/src/kernel.c
+++ b/src/kernel.c
@@ -507,6 +507,9 @@ mrb_obj_instance_eval(mrb_state *mrb, mrb_value self)
   if (mrb_get_args(mrb, "|S&", &a, &b) == 1) {
     mrb_raise(mrb, E_NOTIMP_ERROR, "instance_eval with string not implemented");
   }
+  if (mrb_nil_p(b)) {
+    mrb_raise(mrb, E_ARGUMENT_ERROR, "no block given");
+  }
   switch (mrb_type(self)) {
   case MRB_TT_SYMBOL:
   case MRB_TT_FIXNUM:
-- 
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