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Example of failure on master using widget_instance-master.patch:
haypo@selma$ ./python -m test -v -u all test_ttk_guionly 
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ERROR: test_initialization (tkinter.test.test_ttk.test_extensions.LabeledScaleTest)
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Traceback (most recent call last):
 File "/home/haypo/prog/python/master/Lib/tkinter/test/test_ttk/test_extensions.py", line 14, in tearDown
 super().tearDown()
 File "/home/haypo/prog/python/master/Lib/tkinter/test/support.py", line 40, in tearDown
 w.destroy()
 File "/home/haypo/prog/python/master/Lib/tkinter/__init__.py", line 2305, in destroy
 % self.children)
Exception: destroy() doesn't clear all children: {'!labeledscale2': <tkinter.ttk.LabeledScale object .!frame.!labeledscale2>}
My https://github.com/python/cpython/pull/3025 PR fixes LabeledScale and OptionMenu destroy() method in the master branch.