Why does the CallerArgumentExpressionAttribute exist if no language supports it?

• csharplang

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The first Google result for CallerArgumentExpression is this document which I think does a good job of explaining why it exists.

• CoreFX

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There is when work is being done on it, so that tests can be added: https://github.com/dotnet/corefx/pull/30469

• WorkOS

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• Roslyn

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  The Roslyn .NET compiler provides C# and Visual Basic languages with rich code analysis APIs.

  

It just happens that finishing that work has been delayed, hence why the implementation is incomplete. After all it is a feature that spans several moving parts: the runtime & the compiler (work on Roslyn was merged a few months ago, see https://github.com/dotnet/roslyn/pull/51952).

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