[issue30341] Add an explaining comment in _PyTrash_thread_destroy_chain()

[Xiang Zhang]

Xiang Zhang added the comment:


New changeset a66f9c6bb134561a24374f10e8c35417d356ce14 by Xiang Zhang in branch 'master':
bpo-30341: Improve _PyTrash_thread_destroy_chain() a little bit (#1545)
https://github.com/python/cpython/commit/a66f9c6bb134561a24374f10e8c35417d356ce14


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<http://bugs.python.org/issue30341>
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