1 files changed, 13 insertions, 2 deletions
diff --git a/Python/traceback.c b/Python/traceback.c
index 18bd0bf..04b52ad 100644
--- a/Python/traceback.c
+++ b/Python/traceback.c
@@ -227,13 +227,24 @@ PyTypeObject PyTraceBack_Type = {
     tb_new,                                     /* tp_new */
 };
 
+
+PyObject*
+_PyTraceBack_FromFrame(PyObject *tb_next, PyFrameObject *frame)
+{
+    assert(tb_next == NULL || PyTraceBack_Check(tb_next));
+    assert(frame != NULL);
+
+    return tb_create_raw((PyTracebackObject *)tb_next, frame, frame->f_lasti,
+                         PyFrame_GetLineNumber(frame));
+}
+
+
 int
 PyTraceBack_Here(PyFrameObject *frame)
 {
     PyObject *exc, *val, *tb, *newtb;
     PyErr_Fetch(&exc, &val, &tb);
-    newtb = tb_create_raw((PyTracebackObject *)tb, frame, frame->f_lasti,
-                          PyFrame_GetLineNumber(frame));
+    newtb = _PyTraceBack_FromFrame(tb, frame);
     if (newtb == NULL) {
         _PyErr_ChainExceptions(exc, val, tb);
         return -1;