[issue2091] file accepts 'rU+' as a mode

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I would add a warning in 3.4- (or 3.5-). The 'U' mode should not work
with '+', and it can't work with '+' correctly. This is a bug that we can decide not fix by raising an exception.

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<http://bugs.python.org/issue2091>
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