emoji - Swift `join` hangs when joining string with country flag -

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i discovered while working in swift 1.2. have reported bug. wonder why?

import uikit  var str = "🇬🇧 lhr ✈️ sfo 🇺🇸"  ([str] nsarray).componentsjoinedbystring("") // work join("", [str]) // hangs forever

apple has fix problem in swift 2.0, join replace method joinwithseparator(separator: string) -> string works fine flags.

here code snippet. 

var str = "🇬🇧 lhr ✈️ sfo 🇺🇸"  ([str] nsarray).componentsjoinedbystring("") // work  [str].joinwithseparator("")

output 

🇬🇧 lhr ✈️ sfo 🇺🇸 🇬🇧 lhr ✈️ sfo 🇺🇸 🇬🇧 lhr ✈️ sfo 🇺🇸

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