Changed the way __doc__ is managed to get backward compatible behavior.

_ExtensionClass.c

@@ -308,6 +308,15 @@ EC_init(PyTypeObject *self, PyObject *args, PyObject *kw)
   if (PyType_Type.tp_init(OBJECT(self), args, kw) < 0) 
     return -1; 
 
+  if (self->tp_dict != NULL)
+    {
+      r = PyDict_GetItemString(self->tp_dict, "__doc__");
+      if ((r == Py_None) && 
+          (PyDict_DelItemString(self->tp_dict, "__doc__") < 0)
+          )
+        return -1;
+    }
+
   /* set up __get__, if necessary */
   if (self->tp_descr_get != of_get)
     {

tests.py

@@ -170,6 +170,8 @@ def test__basicnew__():
     {}
     """
 
+
+
 def cmpattrs(self, other, *attrs):
     for attr in attrs:
         if attr[:3] in ('_v_', '_p_'):
@@ -690,6 +692,23 @@ def test_of_not_called_when_not_accessed_through_EC_instance():
 
     """
 
+def test_inheriting___doc__():
+    """Old-style ExtensionClass inherited __doc__ from base classes.
+
+    >>> class E(Base):
+    ...     "eek"
+
+    >>> class EE(E):
+    ...     pass
+
+    >>> EE.__doc__
+    'eek'
+
+    >>> EE().__doc__
+    'eek'
+
+    """
+
 from doctest import DocTestSuite
 import unittest