[issue19421] FileIO destructor imports indirectly the io module at exit

[Roundup Robot]

Roundup Robot added the comment:

New changeset 2d802765d31f by Victor Stinner in branch 'default':
Issue #19421: add an unit test for warnings.warn() during finalization
http://hg.python.org/cpython/rev/2d802765d31f

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<http://bugs.python.org/issue19421>
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