Merge p3yk branch with the trunk up to revision 45595. This breaks a fair
number of tests, all because of the codecs/_multibytecodecs issue described
here (it's not a Py3K issue, just something Py3K discovers):
http://mail.python.org/pipermail/python-dev/2006-April/064051.html

Hye-Shik Chang promised to look for a fix, so no need to fix it here. The
tests that are expected to break are:

test_codecencodings_cn
test_codecencodings_hk
test_codecencodings_jp
test_codecencodings_kr
test_codecencodings_tw
test_codecs
test_multibytecodec

This merge fixes an actual test failure (test_weakref) in this branch,
though, so I believe merging is the right thing to do anyway.
diff --git a/Modules/operator.c b/Modules/operator.c
index 24f4e0a..cbce16e 100644
--- a/Modules/operator.c
+++ b/Modules/operator.c
@@ -354,8 +354,7 @@
 static int
 itemgetter_traverse(itemgetterobject *ig, visitproc visit, void *arg)
 {
-	if (ig->item)
-		return visit(ig->item, arg);
+	Py_VISIT(ig->item);
 	return 0;
 }
 
@@ -493,8 +492,7 @@
 static int
 attrgetter_traverse(attrgetterobject *ag, visitproc visit, void *arg)
 {
-	if (ag->attr)
-		return visit(ag->attr, arg);
+	Py_VISIT(ag->attr);
 	return 0;
 }