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fix Option<~ZeroSizeType> #13267

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fix Option<~ZeroSizeType> #13267

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1778b63 provided the guarantee of no
exchange_free calls for ~ZeroSizeType, so a sentinel can now be used
without overhead.

Closes #11998

@thestinger
fix Option<~ZeroSizeType>
05d0045 
1778b63 provided the guarantee of no
`exchange_free` calls for ~ZeroSizeType, so a sentinel can now be used
without overhead.

Closes #11998
@thestinger thestinger mentioned this pull request Apr 3, 2014
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@alexcrichton alexcrichton mentioned this pull request Apr 3, 2014
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@bors bors closed this in e7fe207 Apr 4, 2014
@thestinger thestinger deleted the zero_size_non_null branch April 4, 2014 15:53
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clamp allocations of size 0 to 1 or pass size to free
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