Implement inner deref for Option and Result#50267

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bors merged 11 commits intorust-lang:masterfrom

humanenginuity:master

Jul 31, 2018

Commits on Apr 30, 2018

fixed some and added more tests
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Commits on May 3, 2018

Added comments providing justification for support of calling deref_* with wrong variant
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Commits on May 6, 2018

resolved conflict with upstream commit
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Commits on Jul 30, 2018

resolved upstream merge conflicts
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