Dave Abrahams e59cb97048 [stdlib/Foundation] Swift 3 backward compatibility hack ...

Since samePosition(in:) now unconditionally returns optionals,
String.UTF16View.Index.distance(to: String.UTF16View.Index) must accept an
optional to keep some code working.

Fixes <rdar://33307780>.

2017-07-14 15:30:06 -07:00

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