[issue41110] 2to3 reports some files as both not changing and having been modified

[SilentGhost]

Change by SilentGhost <ghost.adh at runbox.com>:


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nosy: +benjamin.peterson
type:  -> behavior
versions:  -Python 3.5, Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41110>
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