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A comment on The Next Step for Generics. Parent comment

Re:The Next Step for Generics by balfirevic on Tuesday June 16, 2020 @06:39PM (#23545174)
Sum types are not planned for C# 9, are they?
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Re:The Next Step for Generics by apta on Tuesday June 16, 2020 @09:05PM (#23546465)
It has pattern matching, but not a full discriminated union implementation yet. That seems to be on the roadmap though:

https://github.com/dotnet/csharplang/issues/113

https://github.com/dotnet/csharplang/issues/485

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