From 96e247a4ad5bd137d8c9c7539b3d7457abd1b3f5 Mon Sep 17 00:00:00 2001
From: skandhas <skandhas@163.com>
Date: Sat, 27 Apr 2013 16:39:58 +0800
Subject: detect cyclic-include in Module#include

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

(limited to 'src/class.c')

diff --git a/src/class.c b/src/class.c
index 6b9f246e9..40335e039 100644
--- a/src/class.c
+++ b/src/class.c
@@ -690,6 +690,9 @@ 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) {
+      mrb_raise(mrb, E_ARGUMENT_ERROR, "cyclic include detected");
+    }
     while (p) {
       if (c != p && p->tt == MRB_TT_CLASS) {
         superclass_seen = 1;
-- 
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