test_builtin currently fails for me when hunting refleaks (Fedora 25):
$ ./python -m test -R 3:3 -v test_builtin
[snip]
======================================================================
FAIL: test_input_tty_non_ascii (test.test_builtin.PtyTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/ncoghlan/devel/py36/Lib/test/test_builtin.py", line 1592, in test_input_tty_non_ascii
self.check_input_tty("prompté", b"quux\xe9", "utf-8")
File "/home/ncoghlan/devel/py36/Lib/test/test_builtin.py", line 1583, in check_input_tty
self.assertEqual(input_result, expected)
AssertionError: 'quux' != 'quux\udce9'
- quux
+ quux\udce9
? +
======================================================================
FAIL: test_input_tty_non_ascii_unicode_errors (test.test_builtin.PtyTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/ncoghlan/devel/py36/Lib/test/test_builtin.py", line 1596, in test_input_tty_non_ascii_unicode_errors
self.check_input_tty("prompté", b"quux\xe9", "ascii")
File "/home/ncoghlan/devel/py36/Lib/test/test_builtin.py", line 1583, in check_input_tty
self.assertEqual(input_result, expected)
AssertionError: 'quux' != 'quux\udce9'
- quux
+ quux\udce9
? +
----------------------------------------------------------------------
Ran 78 tests in 0.066s
FAILED (failures=2)
Ned, I'm not sure if this should be a release blocker or not.
Superficially, it looks like it's just a test bug arising from running the test multiple times in the same process, but I unfortunately don't have time to investigate further today.