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Remove always-on OpenTypeDeclaration language feature flag - #20215
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T-Gro wants to merge 3 commits into
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…l parameter The LanguageFeature.OpenTypeDeclaration flag is always-on for every supported --langversion (minimum 8.0, feature shipped in 5.0), so the gated branch is dead. Remove the flag checks at both enforcement sites and drop the now-unused mOpenDecl plumbing from TcOpenTypeDecl and TcOpenDecl and their call sites. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Delete the always-on LanguageFeature.OpenTypeDeclaration DU case, its features-map entry, GetFeatureString arm, and the featureOpenTypeDeclaration FSComp.txt string. Regenerate xlf localization files via UpdateXlf. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
T-Gro
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Aug 10, 2026
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Closing as a duplicate of #20209, which already removes the always-on |
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Fixes#20148
OpenTypeDeclarationhas shipped since F# 5.0 and is enabled for every selectable--langversion(the minimum accepted is 8.0), so its flag could never be turned off. The flag and thecheckLanguageFeatureAndRecoverguard onopen typedeclarations are removed;--disableLanguageFeature:OpenTypeDeclarationis no longer a recognized feature name.