From bf544c05d26ec4cb151cd322e69a495a58924a0d Mon Sep 17 00:00:00 2001
From: ko1 <ko1@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 6 Jun 2007 01:57:36 +0000
Subject: [PATCH] * eval.c (rb_yield): fix to check Qundef.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@12449 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog | 4 ++++
 eval.c    | 7 ++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 9270ed6574..96f2879a41 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Wed Jun  6 10:58:23 2007  Koichi Sasada  <ko1@atdot.net>
+
+	* eval.c (rb_yield): fix to check Qundef.
+
 Wed Jun  6 10:57:45 2007  Koichi Sasada  <ko1@atdot.net>
 
 	* test/ruby/test_continuation.rb: add a test for last commit.
diff --git a/eval.c b/eval.c
index 38c8b84cdc..0c6aceee7e 100644
--- a/eval.c
+++ b/eval.c
@@ -914,7 +914,12 @@ VALUE
 rb_yield(VALUE val)
 {
     volatile VALUE tmp = val;
-    tmp = rb_yield_0(1, &val);
+    if (val == Qundef) {
+	tmp = rb_yield_0(0, 0);
+    }
+    else {
+	tmp = rb_yield_0(1, &val);
+    }
     return tmp;
 }