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omochimetaru
@swift-5.9.2 @swift-5.10.1 @swift-6.0.3 protocol P {} extension Int: @retroactive P {}
swift59 BOT 8/29/2024 4:58 AM
exit status: 1 with <stdin>:2:16: error: unknown attribute 'retroactive' extension Int: @retroactive P {} ^ <stdin>:2:1: error: inheritance from non-protocol type 'any P' extension Int: @retroactive P {} ^