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After applying patch 'regrtest.diff' from issue 20746, the command:
 $ ./python -m test -W -R3:3 test_pdb
succeeds now and shows there are no reference leaks.
However, with the following change in Lib/test/test_pdb.py and patch 'regrtest.diff' applied:
diff --git a/Lib/test/test_pdb.py b/Lib/test/test_pdb.py
--- a/Lib/test/test_pdb.py
+++ b/Lib/test/test_pdb.py
@@ -34,7 +34,7 @@
 """This tests the custom displayhook for pdb.
 
 >>> def test_function(foo, bar):
- ... import pdb; pdb.Pdb(nosigint=True).set_trace()
+ ... import pdb; pdb.Pdb().set_trace()
 ... pass
 
 >>> with PdbTestInput([
there are reference leaks:
$ ./python -m test -R 3:3 test_pdb
[1/1] test_pdb
beginning 6 repetitions
123456
......
test_pdb leaked [200, 200, 200] references, sum=600
test_pdb leaked [43, 43, 43] memory blocks, sum=129
1 test failed:
 test_pdb
And now with the proposed patch in the previous msg 212171 'refleak.patch' of this issue that fixes the sigint_handler leak, and also patch 'regrtest.diff' applied:
$ ./python -m test -R 3:3 test_pdb
[1/1] test_pdb
beginning 6 repetitions
123456
......
1 test OK.