Issue #21112: Fix regression in unittest.expectedFailure on subclasses.

Patch from Berker Peksag.

diff --cc Lib/unittest/case.py
Simple merge

diff --cc Misc/NEWS
index 64aa0e1fa7fe1bf025e1ffc9d15ce59639b69e45,b74b15ce18f56000edb382223b52ea010aa57e5a..55a7e72628bceb8c898dd17399f42a5d6fe8e398
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -11,69 -10,67 +11,72 @@@ Release date: TB
  Core and Builtins
  -----------------
  
 -- Issue #21167: NAN operations are now handled correctly when python is
 -  compiled with ICC even if -fp-model strict is not specified.
 +Library
 +-------
  
 -- Issue #4395: Better testing and documentation of binary operators.
 -  Patch by Martin Panter.
++- Issue #21112: Fix regression in unittest.expectedFailure on subclasses.
++  Patch from Berker Peksag.
+ 
 -- Issue #24467: Fixed possible buffer over-read in bytearray. The bytearray
 -  object now always allocates place for trailing null byte and it's buffer now
 -  is always null-terminated.
 +- Issue #24764: cgi.FieldStorage.read_multi() now ignores the Content-Length
 +  header in part headers. Patch written by Peter Landry and reviewed by Pierre
 +  Quentel.
  
 -- Issue #24115: Update uses of PyObject_IsTrue(), PyObject_Not(),
 -  PyObject_IsInstance(), PyObject_RichCompareBool() and _PyDict_Contains()
 -  to check for and handle errors correctly.
 +- Issue #24913: Fix overrun error in deque.index().
 +  Found by John Leitch and Bryce Darling.
  
 -- Issue #24257: Fixed system error in the comparison of faked
 -  types.SimpleNamespace.
 +- Issue #24774: Fix docstring in http.server.test. Patch from Chiu-Hsiang Hsu.
  
 -- Issue #22939: Fixed integer overflow in iterator object.  Patch by
 -  Clement Rouault.
 +- Issue #21159: Improve message in configparser.InterpolationMissingOptionError.
 +  Patch from Łukasz Langa.
  
 -- Issue #23985: Fix a possible buffer overrun when deleting a slice from
 -  the front of a bytearray and then appending some other bytes data.
 +- Issue #20362: Honour TestCase.longMessage correctly in assertRegex.
 +  Patch from Ilia Kurenkov.
  
 -- Issue #24102: Fixed exception type checking in standard error handlers.
 +- Issue #23572: Fixed functools.singledispatch on classes with falsy
 +  metaclasses.  Patch by Ethan Furman.
 +
 +Documentation
 +-------------
  
 -- Issue #23757: PySequence_Tuple() incorrectly called the concrete list API
 -  when the data was a list subclass.
 +- Issue #23725: Overhaul tempfile docs. Note deprecated status of mktemp.
 +  Patch from Zbigniew Jędrzejewski-Szmek.
  
 -- Issue #24407: Fix crash when dict is mutated while being updated.
 +- Issue #24808: Update the types of some PyTypeObject fields.  Patch by
 +  Joseph Weston.
  
 -- Issue #24096: Make warnings.warn_explicit more robust against mutation of the
 -  warnings.filters list.
 +- Issue #22812: Fix unittest discovery examples.
 +  Patch from Pam McA'Nulty.
  
 -- Issue #23996: Avoid a crash when a delegated generator raises an
 -  unnormalized StopIteration exception.  Patch by Stefan Behnel.
  
 -- Issue #24022: Fix tokenizer crash when processing undecodable source code.
 +What's New in Python 3.5.0 release candidate 3?
 +===============================================
  
 -- Issue #23309: Avoid a deadlock at shutdown if a daemon thread is aborted
 -  while it is holding a lock to a buffered I/O object, and the main thread
 -  tries to use the same I/O object (typically stdout or stderr).  A fatal
 -  error is emitted instead.
 +Release date: 2015-09-06
  
 -- Issue #22977: Fixed formatting Windows error messages on Wine.
 -  Patch by Martin Panter.
 +Core and Builtins
 +-----------------
  
 -- Issue #23803: Fixed str.partition() and str.rpartition() when a separator
 -  is wider then partitioned string.
 +Library
 +-------
  
 -- Issue #23192: Fixed generator lambdas.  Patch by Bruno Cauet.
  
 -- Issue #23629: Fix the default __sizeof__ implementation for variable-sized
 -  objects.
 +What's New in Python 3.5.0 release candidate 2?
 +===============================================
  
 -- Issue #24044: Fix possible null pointer dereference in list.sort in out of
 -  memory conditions.
 +Release date: 2015-08-25
  
 -- Issue #21354: PyCFunction_New function is exposed by python DLL again.
 +Core and Builtins
 +-----------------
  
 -- Issue #23812: Fix asyncio.Queue.get() to avoid loosing items on cancellation.
 -  Patch by Gustavo J. A. M. Carneiro.
 +- Issue #24769: Interpreter now starts properly when dynamic loading
 +  is disabled.  Patch by Petr Viktorin.
 +
 +- Issue #21167: NAN operations are now handled correctly when python is
 +  compiled with ICC even if -fp-model strict is not specified.
 +
 +- Issue #24492: A "package" lacking a __name__ attribute when trying to perform
 +  a ``from .. import ...`` statement will trigger an ImportError instead of an
 +  AttributeError.
  
  Library
  -------