Hi guys, I want to contribute to swift-corelibs-foundation, but I met some problems when testing my code. I got some fatalErrors ( e.g. in test_gettingDatesOnGregorianCalendar(), TimeZone(identifier: "UTC") returns a nil before being unwrapped). Do you have the same problems?
I'm using Xcode 9 beta and have tried both swift-DEVELOPMENT-SNAPSHOT-2017-06-19-a-osx and swift-4.0-DEVELOPMENT-SNAPSHOT-2017-06-12-a-osx (which swift snapshot should I use btw?).
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