Add feature / version mismatch errors in C# 9 #53662

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BillWagner wants to merge 7 commits into dotnet:main from BillWagner:feature-version-errors-9

+299 −205

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Add feature / version mismatch errors in C# 9 #53662

Add new preview errors

Dotnet Policy Service / license/cla succeeded May 8, 2026 in 0s

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