Index: Objects/structseq.c
===================================================================
--- Objects/structseq.c	(revision 59950)
+++ Objects/structseq.c	(working copy)
@@ -4,6 +4,7 @@
 #include "Python.h"
 #include "structmember.h"
 #include "structseq.h"
+#include "tupleobject.h"
 
 static char visible_length_key[] = "n_sequence_fields";
 static char real_length_key[] = "n_fields";
@@ -111,7 +112,7 @@
 	else if (PySlice_Check(item)) {
 		Py_ssize_t start, stop, step, slicelen, cur, i;
 		PyObject *result;
-		
+
 		if (PySlice_GetIndicesEx((PySliceObject *)item,
 					 VISIBLE_SIZE(self), &start, &stop,
 					 &step, &slicelen) < 0) {
@@ -147,18 +148,18 @@
 	Py_ssize_t len, min_len, max_len, i, n_unnamed_fields;
 	static char *kwlist[] = {"sequence", "dict", 0};
 
-	if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|O:structseq", 
+	if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|O:structseq",
 					 kwlist, &arg, &dict))
 		return NULL;
 
 	arg = PySequence_Fast(arg, "constructor requires a sequence");
 
-	if (!arg) {				
+	if (!arg) {
 		return NULL;
 	}
 
 	if (dict && !PyDict_Check(dict)) {
-		PyErr_Format(PyExc_TypeError, 
+		PyErr_Format(PyExc_TypeError,
 			     "%.500s() takes a dict as second arg, if any",
 			     type->tp_name);
 		Py_DECREF(arg);
@@ -172,7 +173,7 @@
 
 	if (min_len != max_len) {
 		if (len < min_len) {
-			PyErr_Format(PyExc_TypeError, 
+			PyErr_Format(PyExc_TypeError,
 	       "%.500s() takes an at least %zd-sequence (%zd-sequence given)",
 				     type->tp_name, min_len, len);
 			Py_DECREF(arg);
@@ -180,16 +181,16 @@
 		}
 
 		if (len > max_len) {
-			PyErr_Format(PyExc_TypeError, 
+			PyErr_Format(PyExc_TypeError,
 	       "%.500s() takes an at most %zd-sequence (%zd-sequence given)",
 				     type->tp_name, max_len, len);
 			Py_DECREF(arg);
 			return NULL;
 		}
-	} 
+	}
 	else {
 		if (len != min_len) {
-			PyErr_Format(PyExc_TypeError, 
+			PyErr_Format(PyExc_TypeError,
 	       "%.500s() takes a %zd-sequence (%zd-sequence given)",
 				     type->tp_name, min_len, len);
 			Py_DECREF(arg);
@@ -216,7 +217,7 @@
 		Py_INCREF(ob);
 		res->ob_item[i] = ob;
 	}
-	
+
 	Py_DECREF(arg);
 	return (PyObject*) res;
 }
@@ -354,7 +355,7 @@
 	PyObject* result;
 	Py_ssize_t n_fields, n_visible_fields, n_unnamed_fields;
 	int i;
-	
+
 	n_fields = REAL_SIZE(self);
 	n_visible_fields = VISIBLE_SIZE(self);
 	n_unnamed_fields = UNNAMED_FIELDS(self);
@@ -373,7 +374,7 @@
 		Py_INCREF(self->ob_item[i]);
 		PyTuple_SET_ITEM(tup, i, self->ob_item[i]);
 	}
-	
+
 	for (; i < n_fields; i++) {
 		char *n = Py_TYPE(self)->tp_members[i-n_unnamed_fields].name;
 		PyDict_SetItemString(dict, n,
@@ -441,7 +442,7 @@
 	structseq_methods,      		/* tp_methods */
         NULL,			             	/* tp_members */
 	0,			          	/* tp_getset */
-	0,					/* tp_base */
+	&PyTuple_Type,				/* tp_base */
 	0,					/* tp_dict */
 	0,					/* tp_descr_get */
 	0,					/* tp_descr_set */
@@ -482,7 +483,7 @@
 	members = PyMem_NEW(PyMemberDef, n_members-n_unnamed_members+1);
 	if (members == NULL)
 		return;
-	
+
 	for (i = k = 0; i < n_members; ++i) {
 		if (desc->fields[i].name == PyStructSequence_UnnamedField)
 			continue;