I skipped the failing tests just to be able to push my FASTCALL changes before Python 3.6 feature freeze.

I opened this issue to not forget to fix it.

New changeset a77756e480c2 by Victor Stinner in branch 'default':
Rework CALL_FUNCTION* opcodes
https://hg.python.org/cpython/rev/a77756e480c2

Serhiy proposed a fix in the issue #27213 (starting at callfunc-10.patch).

Oh, this issue was already fixed, thanks Serhiy :-)

changeset:   103659:51b635e81958
user:        Serhiy Storchaka <storchaka@gmail.com>
date:        Mon Sep 12 00:52:40 2016 +0300
files:       Include/abstract.h Lib/dis.py Lib/test/test_extcall.py Lib/test/test_traceback.py Objects/abstract.c Objects/methodobject.c Python/ceval.c Python/compile.c Python/importlib.h Python/imp
description:
Issue #27213: Fixed different issues with reworked CALL_FUNCTION* opcodes.

* BUILD_TUPLE_UNPACK and BUILD_MAP_UNPACK_WITH_CALL no longer generated with
  single tuple or dict.
* Restored more informative error messages for incorrect var-positional and
  var-keyword arguments.
* Removed code duplications in _PyEval_EvalCodeWithName().
* Removed redundant runtime checks and parameters in _PyStack_AsDict().
* Added a workaround and enabled previously disabled test in test_traceback.
* Removed dead code from the dis module.

It is rather worked around.

Serhiy Storchaka added the comment:
> It is rather worked around.

The test pass, the change looks good to me. I don't think that it's
still worth it to keep the issue open ;-)