* 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

@@ -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.

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;
 }