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A comment on TypeScript Is Surprisingly OK for Compilers. Parent comment

Re:TypeScript Is Surprisingly OK for Compilers by hardware2win on Friday August 18, 2023 @04:27AM (#37172764)
>compiler can't prove the above code is exhaustive because no proper sum types

Thats because c#s enum is not "closed"

https://github.com/dotnet/csharplang/issues/3179

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