From c4a225f0be7281ed2d303c908aed2c327b37a572 Mon Sep 17 00:00:00 2001
From: ksss <co000ri@gmail.com>
Date: Mon, 19 May 2014 19:29:33 +0900
Subject: mrb_include_module support class and module that not have methods
 each other

---
 src/class.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/class.c b/src/class.c
index ea58265d7..852c88757 100644
--- a/src/class.c
+++ b/src/class.c
@@ -741,7 +741,7 @@ mrb_include_module(mrb_state *mrb, struct RClass *c, struct RClass *m)
     struct RClass *p = c, *ic;
     int superclass_seen = 0;
 
-    if (c->mt == m->mt) {
+    if (c->mt && c->mt == m->mt) {
       mrb_raise(mrb, E_ARGUMENT_ERROR, "cyclic include detected");
     }
     while (p) {
-- 
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