Newest roslyn not being used?

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C# 13 introduced some new syntax: class A<T> where T : allows ref struct;

With LINQPad 8 & .NET 9 RC2 installed, I have .NET 9 selected as target framework and checkbox set for Enable C# preview features. However, the above syntax is still unrecognized in the query and generates compiler errors, which makes me believe it's actually not using latest .NET Roslyn.

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