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ikesyo 10/11/2018 10:56 AM
hasいらなくないでしょうか
10:56 AM
https://github.com/apple/swift-evolution/blob/master/proposals/0190-target-environment-platform-condition.md
apple/swift-evolution
This maintains proposals for changes and user-visible enhancements to the Swift Programming Language. - apple/swift-evolution
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10:56 AM
targetEnvironment()
10:57 AM
4.1実装なのでXcode 9.3から使えるはずです