Index: Lib/test/regrtest.py
===================================================================
--- Lib/test/regrtest.py	(revision 61203)
+++ Lib/test/regrtest.py	(working copy)
@@ -649,7 +649,6 @@
 def dash_R(the_module, test, indirect_test, huntrleaks):
     # This code is hackish and inelegant, but it seems to do the job.
     import copy_reg, _abcoll
-    from abc import _Abstract
 
     if not hasattr(sys, 'gettotalrefcount'):
         raise Exception("Tracking reference leaks requires a debug build "
@@ -661,8 +660,9 @@
     pic = sys.path_importer_cache.copy()
     abcs = {}
     for abc in [getattr(_abcoll, a) for a in _abcoll.__all__]:
-        if not issubclass(abc, _Abstract):
+        if getattr(abc, '__abstractmethods__', None) is None:
             continue
+        print abc
         for obj in abc.__subclasses__() + [abc]:
             abcs[obj] = obj._abc_registry.copy()
 
@@ -699,7 +699,6 @@
     import _strptime, linecache, dircache
     import urlparse, urllib, urllib2, mimetypes, doctest
     import struct, filecmp, _abcoll
-    from abc import _Abstract
     from distutils.dir_util import _path_created
 
     # Restore some original values.
@@ -714,7 +713,7 @@
 
     # Clear ABC registries, restoring previously saved ABC registries.
     for abc in [getattr(_abcoll, a) for a in _abcoll.__all__]:
-        if not issubclass(abc, _Abstract):
+        if getattr(abc, '__abstractmethods__', None) is None:
             continue
         for obj in abc.__subclasses__() + [abc]:
             obj._abc_registry = abcs.get(obj, {}).copy()