In which version of .NET will Microsoft release discriminated unions (aka type unions)?

Question

Microsoft has released a proposal for adding discriminated unions (aka type unions) to .NET

https://github.com/dotnet/csharplang/blob/main/proposals/TypeUnions.md

It is at an early stage now, in what version of .NET will it be fully released?

Manifold Markets · Answer

Per Manifold Markets prediction market, Later, followed by .NET 11 (2026) and .NET 10 (2025) are most likely. See the market for live updates (5 traders, as of Sep 26, 2026).

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