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asStruct
などのキャストプロパティを追加します。as?
演算子は、as? any NominalTypeDecl
と書くべきところでas? any NominalType
と書いてしまうなどのミスが生じたり、Xcodeが変換候補を提供しない、式を丸括弧で包む必要がある、などの欠点があります。
それを補うため、補間によって候補を列挙したり、入力ミスをしない方法を提供します。