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[C# 15-Fundamentals and reference]: Update on unions #54001

@BillWagner

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@BillWagner

.NET 11 Preview

.NET 11 Preview 5

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New behavior

For preview 5, more of the union based functionality is in place. In addition, some existing features have changed.

Check all spec updates and preview 5 behavior, but the major changes are:

  • Member providers are implemented.
  • TryGetValue

Pattern matching has updates as well.

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Associated WorkItem - 580718

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