Index: Objects/exceptions.c
===================================================================
--- Objects/exceptions.c	(revision 61480)
+++ Objects/exceptions.c	(working copy)
@@ -189,6 +189,11 @@
 static PyObject *
 BaseException_getitem(PyBaseExceptionObject *self, Py_ssize_t index)
 {
+    if (Py_Py3kWarningFlag &&
+	PyErr_Warn(PyExc_DeprecationWarning,
+		   "In 3.x, __getitem__ is not supported for exception"
+		   " classes, use args attribute"))
+	return NULL;
     return PySequence_GetItem(self->args, index);
 }
 
@@ -196,6 +201,11 @@
 BaseException_getslice(PyBaseExceptionObject *self,
 			Py_ssize_t start, Py_ssize_t stop)
 {
+    if (Py_Py3kWarningFlag &&
+	PyErr_Warn(PyExc_DeprecationWarning,
+		   "In 3.x, __getslice__ is not supported for exception"
+		   " classes, use args attribute"))
+	return NULL;
     return PySequence_GetSlice(self->args, start, stop);
 }