internal static void CheckFeatureAvailabilityForStaticAbstractMembersInInterfacesIfNeeded(DeclarationModifiers mods, bool isExplicitInterfaceImplementation, Location location, BindingDiagnosticBag diagnostics) { if (isExplicitInterfaceImplementation && (mods & DeclarationModifiers.Static) != 0) { Debug.Assert(location.SourceTree is not null); LanguageVersion availableVersion = ((CSharpParseOptions)location.SourceTree.Options).LanguageVersion; LanguageVersion requiredVersion = MessageID.IDS_FeatureStaticAbstractMembersInInterfaces.RequiredVersion(); if (availableVersion < requiredVersion) { ModifierUtils.ReportUnsupportedModifiersForLanguageVersion(mods, DeclarationModifiers.Static, location, diagnostics, availableVersion, requiredVersion); } } }