Add more future imports to increase compatibility with Python 3 in bootstrap#45138

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bors merged 2 commits intorust-lang:masterfrom

johnthagen:future_imports

Oct 17, 2017

Commits on Oct 9, 2017

Add __future__ imports to increase compatibility with Python 3. Derive Option from object to make it a new-style class for Python 3 compatibility.
johnthagen
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Commits on Oct 16, 2017

Merge branch 'master' into future_imports
johnthagen
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