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norio_nomura 1/25/2018 2:09 PM
Release_Notes_for_Xcode_9.3_beta.pdf より ## Known Issues in Xcode 9.3 beta ### Swift Compiler - Conditional conformances are unsupported when performing a dynamic cast (with is or as). これってSwift 4.1リリースでも直らないんだよね? (edited)