Index: Python/traceback.c
===================================================================
--- Python/traceback.c	(revision 66801)
+++ Python/traceback.c	(working copy)
@@ -11,20 +11,14 @@
 
 #define OFF(x) offsetof(PyTracebackObject, x)
 
-static struct memberlist tb_memberlist[] = {
-	{"tb_next",	T_OBJECT,	OFF(tb_next)},
-	{"tb_frame",	T_OBJECT,	OFF(tb_frame)},
-	{"tb_lasti",	T_INT,		OFF(tb_lasti)},
-	{"tb_lineno",	T_INT,		OFF(tb_lineno)},
+static PyMemberDef tb_memberlist[] = {
+	{"tb_next",	T_OBJECT,	OFF(tb_next), RO},
+	{"tb_frame",	T_OBJECT,	OFF(tb_frame), RO},
+	{"tb_lasti",	T_INT,		OFF(tb_lasti), RO},
+	{"tb_lineno",	T_INT,		OFF(tb_lineno), RO},
 	{NULL}	/* Sentinel */
 };
 
-static PyObject *
-tb_getattr(PyTracebackObject *tb, char *name)
-{
-	return PyMember_Get((char *)tb, tb_memberlist, name);
-}
-
 static void
 tb_dealloc(PyTracebackObject *tb)
 {
@@ -58,7 +52,7 @@
 	0,
 	(destructor)tb_dealloc, /*tp_dealloc*/
 	0,		/*tp_print*/
-	(getattrfunc)tb_getattr, /*tp_getattr*/
+	0,              /*tp_getattr*/
 	0,		/*tp_setattr*/
 	0,		/*tp_compare*/
 	0,		/*tp_repr*/
@@ -80,8 +74,8 @@
 	0,					/* tp_iter */
 	0,					/* tp_iternext */
 	0,					/* tp_methods */
-	0,			/* tp_members */
-	0,			/* tp_getset */
+	tb_memberlist,			        /* tp_members */
+	0,			                /* tp_getset */
 	0,					/* tp_base */
 	0,					/* tp_dict */
 };