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c++ if (conformance->getSourceKind() == ConformanceEntryKind::Implied && !Proto->isMarkerProtocol()) {
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Implyされたconformance entryに関して、それが marker protocol でなければ 、 ERROR(conditional_conformances_cannot_imply_conformances,none, "conditional conformance of type %0 to protocol %1 does not imply conformance to " "inherited protocol %2", (Type, Type, Type)) のエラーが出るようになってる。
Introduce two semantic tweaks for marker protocols: Allow implied conditional conformances to marker protocols. Ban use of marker protocols in conditional conformances to non-marker protocols
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この分岐のパッチあった(edited)
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This improves source compatibility in cases where a marker protocol is introduced after-the-fact (e.g., for Error), and is safe because there's no runtime component to marker protocols.
