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rintaro 9/26/2017 1:41 AM
3.2 と 4.0 で挙動違うとなると SE-110 https://github.com/apple/swift-evolution/blob/master/proposals/0110-distingish-single-tuple-arg.md 絡みの何かっぽいですね。
apple/swift-evolution
swift-evolution - This maintains proposals for changes and user-visible enhancements to the Swift Programming Language.
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