Issue #13577: various kinds of descriptors now have a __qualname__ attribute.
Patch by sbt.
diff --git a/Include/descrobject.h b/Include/descrobject.h
index 646b3cc..e2ba97f 100644
--- a/Include/descrobject.h
+++ b/Include/descrobject.h
@@ -42,6 +42,7 @@
     PyObject_HEAD
     PyTypeObject *d_type;
     PyObject *d_name;
+    PyObject *d_qualname;
 } PyDescrObject;
 
 #define PyDescr_COMMON PyDescrObject d_common