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/Objects/cellobject.c b/Objects/cellobject.c
index 3b87093..da48dea 100644
--- a/Objects/cellobject.c
+++ b/Objects/cellobject.c
@@ -73,19 +73,29 @@
 static int
 cell_traverse(PyCellObject *op, visitproc visit, void *arg)
 {
-	if (op->ob_ref)
-		return visit(op->ob_ref, arg);
+	Py_VISIT(op->ob_ref);
 	return 0;
 }
 
 static int
 cell_clear(PyCellObject *op)
 {
-	Py_XDECREF(op->ob_ref);
-	op->ob_ref = NULL;
+	Py_CLEAR(op->ob_ref);
 	return 0;
 }
 
+static PyObject *
+cell_get_contents(PyCellObject *op, void *closure)
+{
+	Py_XINCREF(op->ob_ref);
+	return op->ob_ref;
+}
+
+static PyGetSetDef cell_getsetlist[] = {
+	{"cell_contents", (getter)cell_get_contents, NULL},
+	{NULL} /* sentinel */
+};
+
 PyTypeObject PyCell_Type = {
 	PyObject_HEAD_INIT(&PyType_Type)
 	0,
@@ -111,4 +121,11 @@
  	0,					/* tp_doc */
  	(traverseproc)cell_traverse,		/* tp_traverse */
  	(inquiry)cell_clear,			/* tp_clear */
+	0,					/* tp_richcompare */
+	0,					/* tp_weaklistoffset */
+	0, 					/* tp_iter */
+	0,					/* tp_iternext */
+	0,					/* tp_methods */
+	0,					/* tp_members */
+	cell_getsetlist,			/* tp_getset */
 };