Sort of. They are a part of C#14 and .net10. Which officially releases in Nov, but has been out as preview for a while now.

Maybe I'm missing something, but it doesn't look like C# 14 will include them nor release in November https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/cs...

	▲	valiant55 4 days ago \| parent [-]
		They might make it into v15 next year according to the latest presentation from Mads. They have the design hammered out just needs to be implemented. It sounds like it should be in an early preview version to let the other teams start to build features asap.