Max Moiseev 288eee0b1b [stdlib] New overload for joined() ...

Now that `String` conforms to the `BidirectionalCollection` protocol, in
the expression `let x = [""].joined()` the best matching overload for
`joined` is no longer the one returning `String`.

Fixes: <rdar://problem/31899440>

2017-05-01 12:41:57 -07:00

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