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Thank you, Chris. I'm rather ashamed of how long I've spent beating my head on this issue and missed the spare tests reference in runtest_inner.
Simply removing the "tests" name entirely clears things up, if this isn't too ugly:
diff -r 5f655369ef06 Lib/test/regrtest.py
--- a/Lib/test/regrtest.py Mon Jan 28 13:27:02 2013 +0200
+++ b/Lib/test/regrtest.py Mon Jan 28 08:50:59 2013 -0600
@@ -1275,8 +1275,8 @@
 # tests. If not, use normal unittest test loading.
 test_runner = getattr(the_module, "test_main", None)
 if test_runner is None:
- tests = unittest.TestLoader().loadTestsFromModule(the_module)
- test_runner = lambda: support.run_unittest(tests)
+ test_runner = lambda: support.run_unittest(
+ unittest.TestLoader().loadTestsFromModule(the_module))
 test_runner()
 if huntrleaks:
 refleak = dash_R(the_module, test, test_runner,
As far as the reap_threads wrapper and reap_children follow-up, I think the TestSuite subclass and load_tests function in the last patch I uploaded may be about the simplest way to keep them for this test without adding them to all tests (by adding it to regrtest.runtest_inner). If anyone thinks the 'ReapedSuite' class (or a better named copy) could be useful elsewhere, it might could go in test.support which would make test_concurrent_futures look a little cleaner.
Patch v3 is v2 plus the regrtest change inline above.