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tarunon 3/8/2019 2:45 PM
https://github.com/apple/swift-evolution/blob/master/proposals/0212-compiler-version-directive.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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2:45 PM
これですね！
2:45 PM
compiler(5.0)を入れれば良いのかな