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Sorry, I don't have patch, but regrtest.py -R not working now.
E:\python-dev\trunk\Lib\test>py25 regrtest.py -R ::
test_grammar
test_grammar skipped -- No module named _abcoll
E:\python-dev\trunk\Lib\test>py regrtest.py -R ::
test_grammar
test_grammar skipped -- cannot import name _Abstract
E:\python-dev\trunk\Lib\test>py3k regrtest.py -R ::
 File "regrtest.py", line 174
 print __doc__
 ^
SyntaxError: invalid syntax

Sorry, I was stupid. I ran test in wrong directory.
release25-maint runs fine, and other two has same
error.
test_grammar
test_grammar skipped -- cannot import name _Abstract

I'm going to work on the issue later

It looks like you are running regrtest from the trunk with the py3k
interpretor.
Works for me.

Yes, I did mistake first, but py3k fails even in correct directory.
E:\python-dev\py3k\Lib\test>py3k --version
Python 3.0a3+
E:\python-dev\py3k\Lib\test>py3k regrtest.py -R :: test_os.py
test_os
test_os skipped -- cannot import name _Abstract
1 test skipped:
 test_os
1 skip unexpected on win32:
 test_os
[43267 refs]
abc._Abstract seems to be gone at r61098, but regrtest.py still
references to it.

attached simple patch seems to fix the problem but should be reviewed by
Christian.

It seems r61204 has fixed the bug. Can you test it on your machine
please? My old laptop is too slow.

> Can you test it on your machine please?
Running on a 4-core Opteron (2.6GHz).
Should complete in an hour or so ...

test_collections fails (with -R :: only). Does not look like something
related to the recent changes, rather test is not happy about being
repeated.
$ ./python Lib/test/regrtest.py -R :: test_collections 
test_collections
beginning 9 repetitions
123456789
test test_collections failed -- Traceback (most recent call last):
 File "Lib/doctest.py", line 2131, in runTest
 raise self.failureException(self.format_failure(new.getvalue()))
AssertionError: Failed doctest test for collections.namedtuple
 File "Lib/collections.py", line 13, in namedtuple
..

Here are the results from regrtest.py -R ::
..
301 tests OK.
7 tests failed:
 test_collections test_cprofile test_frozen test_inspect
 test_logging test_pkg test_profile
..
$ cat reflog.txt
test_cmd_line leaked [-23, 0, 0, 23] references, sum=0
test_compiler leaked [0, 0, 18, 0] references, sum=18
test_deque leaked [100, 100, 100, 100] references, sum=400
test_ftplib leaked [0, 172, -6, -166] references, sum=0
test_heapq leaked [108, 130, 121, 114] references, sum=473
test_itertools leaked [7380, 7380, 7380, 7380] references, sum=29520
test_list leaked [50, 50, 50, 50] references, sum=200
test_set leaked [680, 680, 680, 680] references, sum=2720
test_smtplib leaked [0, 0, -86, 86] references, sum=0
test_threading leaked [0, 86, -86, 86] references, sum=86
test_urllib2_localnet leaked [3, 3, 3, 3] references, sum=12
test_userlist leaked [50, 50, 50, 50] references, sum=200
Do buildbots run -R regressions?

I can see test_collections.py failure even on r61203
(just before Christian's commit) - r61098 (removed abc._Abstract)
E:\python-dev\trunk\Lib\test>py regrtest.py -R :: test_collections.py
test_collections
beginning 9 repetitions
123456789
test test_collections failed -- Traceback (most recent call last):
 File "e:\python-dev\trunk\lib\doctest.py", line 2131, in runTest
 raise self.failureException(self.format_failure(new.getvalue()))
AssertionError: Failed doctest test for collections.namedtuple
 File "e:\python-dev\trunk\lib\collections.py", line 13, in namedtuple
----------------------------------------------------------------------
File "e:\python-dev\trunk\lib\collections.py", line 16, in
collections.namedtupl
e
Failed example:
 Point = namedtuple('Point', 'x y')
Exception raised:
 Traceback (most recent call last):
 File "e:\python-dev\trunk\lib\doctest.py", line 1231, in __run
 compileflags, 1) in test.globs
 File "<doctest collections.namedtuple[0]>", line 1, in <module>
 Point = namedtuple('Point', 'x y')
 NameError: name 'namedtuple' is not defined
(snip)
I'll run py regrtest.py -R :: on r61203 - r61098 and compare its
result to Alexander's result, but my machine is damn slow, probably
it'll take long time.

>I'll run py regrtest.py -R :: on r61203 - r61098 and compare its
>result to Alexander's result, but my machine is damn slow, probably
>it'll take long time.
Sorry, I abandoned this at test_compiler. Please forget this sentense...
Anyway, Christian's fix greatly works for me. Thanks!
>E:\python-dev\trunk\Lib\test>py regrtest.py -R :: test_collections.py
For this error, I could write a minimam code to reproduce it.
Please expand the attached zip file into lib/test and run a.py.
You'll see similar error.

I wrote simple patch to workaround this problem.
(avoid to reuse DocTestSuite)
# To my eyes, doctest.DocTestSuite(module=collections)
# and test_support.run_doctest(collections, verbose)
# are doing same test???

I did more investigation.
Failure on second DocTestSuite run happens because
lib/doctest.py (2107) test.globs.clear()
is executed after first test runs.
I don't know if this is bug or not. Document in
doctest.py says test.globs will be untouched on
failure but become empty on success, but this
behavior prevents reusage of DocTestSuite.

No known issues with "regrtest -R :" on trunk.