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t.ae 11/16/2020 4:43 AM
https://github.com/apple/swift-evolution/blob/master/proposals/0143-conditional-conformances.md#implied-conditional-conformances これが説明してそうですね
apple/swift-evolution
This maintains proposals for changes and user-visible enhancements to the Swift Programming Language. - apple/swift-evolution
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4:45 AM
例に出てるコードはちょっと違うかな……