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Remove obsolete C# extension language feature flag - #20796
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Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: d602cc67-3f25-4432-81d4-77b542f7dce3
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October 16, 2026 18:28
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Fixes #20197
--disableLanguageFeature:CSharpExtensionAttributeNotRequiredis no longer recognized; the compiler always uses the F# 8.0 behavior for C#-style extension attributes.