[🐣질문] 유니티 2021 버전 부터 C# 9.0 된다는데 어떻게함?

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적용 안되는거 같은데 

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2021.2인가 3부터 아님? 2021.1 쓰는 중인지 확인해보셈

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2021.3.8f1 쓰고있음

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그럼 될텐데? C# 9.0 기능 중에 뭐를 쓸려고 한거임?

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new() 랑 record 쓸려니깐 "미리 정의된 형식 'System.Runtime.CompilerServices.IsExternalInit'을(를) 정의하지 않았거나 가져오지 않았습니다." 라고 뜨네

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https://docs.unity3d.com/2021.3/Documentation/Manual/CSharpCompiler.html

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The type System.Runtime.CompilerServices.IsExternalInit is required for full record support as it uses init only setters, but is only available in .NET 5 and later (which Unity doesn’t support). Users can work around this issue by declaring the System.Runtime.CompilerServices.IsExternalInit type in their own projects. 라고 하네

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됬따 ㄳㄳ

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https://stackoverflow.com/questions/64749385/predefined-type-system-runtime-compilerservices-isexternalinit-is-not-defined