51public override MessageID MessageID { get { return MessageID.IDS_FeatureQueryExpression; } } // TODO: what is the correct ID here?

713Error(diagnostics, ErrorCode.ERR_BadSKknown, node, ns.NamespaceSymbol, MessageID.IDS_SK_NAMESPACE.Localize(), MessageID.IDS_SK_VARIABLE.Localize()); 718Error(diagnostics, ErrorCode.ERR_BadSKknown, node, type.Type, MessageID.IDS_SK_TYPE.Localize(), MessageID.IDS_SK_VARIABLE.Localize()); 729Error(diagnostics, GetMethodGroupOrFunctionPointerLvalueError(valueKind), node, unconvertedAddressOf.Operand.Name, MessageID.IDS_AddressOfMethodGroup.Localize()); 740Error(diagnostics, GetMethodGroupOrFunctionPointerLvalueError(valueKind), node, methodGroup.Name, MessageID.IDS_MethodGroup.Localize()); 994Error(diagnostics, ErrorCode.ERR_BadSKknown, expr.Syntax, ((BoundNamespaceExpression)expr).NamespaceSymbol, MessageID.IDS_SK_NAMESPACE.Localize(), MessageID.IDS_SK_VARIABLE.Localize()); 997Error(diagnostics, ErrorCode.ERR_BadSKunknown, expr.Syntax, expr.Type, MessageID.IDS_SK_TYPE.Localize()); 1012else if (this.IsDirectlyInIterator && Compilation.IsFeatureEnabled(MessageID.IDS_FeatureRefUnsafeInIteratorAsync)) 1749CheckFeatureAvailability(node, MessageID.IDS_FeatureInitOnlySetters, diagnostics); 3069MessageID cause; 3072cause = MessageID.IDS_FOREACHLOCAL; 3076cause = MessageID.IDS_USINGLOCAL; 3080cause = MessageID.IDS_FIXEDLOCAL;

23MessageID.IDS_FeatureAnonymousTypes.CheckFeatureAvailability(diagnostics, node.NewKeyword);

542CheckFeatureAvailability(namedArgument, MessageID.IDS_FeatureInitOnlySetters, diagnostics);

21MessageID.IDS_FeatureAsync.CheckFeatureAvailability(diagnostics, node.AwaitKeyword); 221(nodeOrToken.SyntaxTree as CSharpSyntaxTree)?.Options?.IsFeatureEnabled(MessageID.IDS_AwaitInCatchAndFinally) == false) 227(nodeOrToken.SyntaxTree as CSharpSyntaxTree)?.Options?.IsFeatureEnabled(MessageID.IDS_AwaitInCatchAndFinally) == false)

216CheckFeatureAvailability(syntax, MessageID.IDS_FeatureDefaultTypeParameterConstraint, diagnostics); 319CheckFeatureAvailability(allowsConstraint, MessageID.IDS_FeatureAllowsRefStructConstraint, diagnostics); 566CheckFeatureAvailability(syntax, MessageID.IDS_FeatureEnumGenericTypeConstraint, diagnostics); 571CheckFeatureAvailability(syntax, MessageID.IDS_FeatureDelegateGenericTypeConstraint, diagnostics);

421CheckFeatureAvailability(syntax, MessageID.IDS_FeatureStaticAbstractMembersInInterfaces, diagnostics); 433CheckFeatureAvailability(syntax, MessageID.IDS_FeatureCheckedUserDefinedOperators, diagnostics); 444CheckFeatureAvailability(syntax, MessageID.IDS_FeatureInlineArrays, diagnostics); 488CheckFeatureAvailability(syntax, MessageID.IDS_FeatureFirstClassSpan, diagnostics);

371CheckFeatureAvailability(syntax, MessageID.IDS_FeatureNativeInt, diagnostics); 938CheckFeatureAvailability(parameter.ReadOnlyKeyword, MessageID.IDS_FeatureRefReadonlyParameters, diagnostics, forceWarning: true);

45MessageID.IDS_FeatureMixedDeclarationsAndExpressionsInDeconstruction 54MessageID.IDS_FeatureMixedDeclarationsAndExpressionsInDeconstruction 765MessageID.IDS_FeatureTuples.CheckFeatureAvailability(diagnostics, component.Designation); 773MessageID.IDS_FeatureTuples.CheckFeatureAvailability(diagnostics, node);

420if (CheckFeatureAvailability(syntax, MessageID.IDS_FeatureInferredDelegateType, diagnostics)) 714MessageID.IDS_FeatureDefaultLiteral.CheckFeatureAvailability(diagnostics, node); 874MessageID.IDS_FeatureThrowExpression.CheckFeatureAvailability(diagnostics, node.ThrowKeyword); 997MessageID.IDS_FeatureTuples.CheckFeatureAvailability(diagnostics, node); 1508var requiredVersion = MessageID.IDS_FeatureFieldKeyword.RequiredVersion(); 1545case ManagedKind.UnmanagedWithGenerics when MessageID.IDS_FeatureUnmanagedConstructedTypes.GetFeatureAvailabilityDiagnosticInfo(compilation) is CSDiagnosticInfo diagnosticInfo: 1563MessageID.IDS_FeatureDefault.CheckFeatureAvailability(diagnostics, node.Keyword); 1855CheckFeatureAvailability(node, MessageID.IDS_FeatureDiscards, diagnostics); 2295if (!IsInsideNameof || (EnclosingNameofArgument != node && !node.IsFeatureEnabled(MessageID.IDS_FeatureInstanceMemberInNameof))) 2329CheckFeatureAvailability(node, MessageID.IDS_FeatureInstanceMemberInNameof, diagnostics); 2589CheckFeatureAvailability(node, MessageID.IDS_FeatureIndexOperator, diagnostics); 2630CheckFeatureAvailability(node, MessageID.IDS_FeatureRangeOperator, diagnostics); 2811diagnostics.Add(ErrorCode.ERR_NoExplicitConv, syntax.Location, MessageID.IDS_SK_METHOD.Localize(), targetType); 2985nameString = MessageID.IDS_Lambda.Localize().ToString(); 3120MessageID.IDS_FeatureReadOnlyReferences.CheckFeatureAvailability(diagnostics, argumentSyntax.RefKindKeyword); 3125MessageID.IDS_FeatureOutVar.CheckFeatureAvailability(diagnostics, argumentSyntax.RefKindKeyword); 3205CheckFeatureAvailability(declarationExpression, MessageID.IDS_FeatureExpressionVariablesInQueriesAndInitializers, diagnostics); 3283CheckFeatureAvailability(syntax, MessageID.IDS_FeatureRefUnsafeInIteratorAsync, diagnostics); 3323CheckFeatureAvailability(nameColonSyntax, MessageID.IDS_FeatureNamedArgument, diagnostics); 3370new CSharpRequiredLanguageVersion(MessageID.IDS_FeatureNonTrailingNamedArguments.RequiredVersion())); 3442if (!Compilation.IsFeatureEnabled(MessageID.IDS_FeatureRefReadonlyParameters)) 3449var available = CheckFeatureAvailability(argument.Syntax, MessageID.IDS_FeatureRefReadonlyParameters, diagnostics); 4095MessageID.IDS_FeatureImplicitArray.CheckFeatureAvailability(diagnostics, node.NewKeyword); 4560LanguageVersion requiredVersion = MessageID.IDS_FeatureNestedStackalloc.RequiredVersion(); 4566MessageID.IDS_FeatureNestedStackalloc.CheckFeatureAvailability(diagnostics, node.GetFirstToken()); 4585CheckFeatureAvailability(node, MessageID.IDS_FeatureRefStructs, diagnostics); 4648MessageID.IDS_FeatureStackAllocInitializer.CheckFeatureAvailability(diagnostics, stackAllocKeyword); 5148MessageID.IDS_FeatureImplicitObjectCreation.CheckFeatureAvailability(diagnostics, node.NewKeyword); 5235MessageID.IDS_FeatureCollectionExpressions.CheckFeatureAvailability(diagnostics, syntax, syntax.OpenBracketToken.GetLocation()); 5660MessageID.IDS_FeatureObjectInitializer.CheckFeatureAvailability(diagnostics, initializerSyntax.OpenBraceToken); 5864MessageID.IDS_FeatureDictionaryInitializer.CheckFeatureAvailability(diagnostics, implicitIndexing.ArgumentList.OpenBracketToken); 5962MessageID.IDS_FeatureImplicitIndexerInitializer.CheckFeatureAvailability(diagnostics, implicitIndexer.Syntax); 6235MessageID.IDS_FeatureCollectionInitializer.CheckFeatureAvailability(diagnostics, initializerSyntax.OpenBraceToken); 6296CheckFeatureAvailability(node, MessageID.IDS_FeatureRefStructInterfaces, diagnostics); 7364MessageID.IDS_FeatureRawStringLiterals.CheckFeatureAvailability(diagnostics, node); 7377CheckFeatureAvailability(node, MessageID.IDS_FeatureRawStringLiterals, diagnostics); 7380CheckFeatureAvailability(node, MessageID.IDS_FeatureUtf8StringLiterals, diagnostics); 7677var msgId = ((UnboundLambda)boundLeft).MessageID; 7876CheckFeatureAvailability(boundLeft.Syntax, MessageID.IDS_FeatureStaticAbstractMembersInInterfaces, diagnostics); 7908Compilation.LanguageVersion < MessageID.IDS_FeatureNullableReferenceTypes.RequiredVersion()) 7937Error(diagnostics, ErrorCode.ERR_BadSKunknown, methodGroup.NameSyntax, method, MessageID.IDS_SK_METHOD.Localize()); 8594CheckFeatureAvailability(node, MessageID.IDS_FeatureIndexingMovableFixedBuffers, diagnostics); 8640CheckFeatureAvailability(node, MessageID.IDS_FeatureRefFields, diagnostics); 8849else if (CheckFeatureAvailability(node, MessageID.IDS_FeatureInstanceMemberInNameof, diagnostics)) 9219CheckFeatureAvailability(node, MessageID.IDS_FeatureInlineArrays, diagnostics); 9977_ = MessageID.IDS_FeatureIndexOperator.CheckFeatureAvailability(diagnostics, syntax); 10974MessageID.IDS_FeatureNullPropagatingOperator.CheckFeatureAvailability(diagnostics, node.OperatorToken); 11151var msgId = ((UnboundLambda)receiver).MessageID;

100var withoutUnsafe = isIteratorBody && this.Compilation.IsFeatureEnabled(MessageID.IDS_FeatureRefUnsafeInIteratorAsync);

21if (CheckFeatureAvailability(node, MessageID.IDS_FeatureInterpolatedStrings, diagnostics)) 27CheckFeatureAvailability(node, MessageID.IDS_FeatureRawStringLiterals, diagnostics); 32if (startText.StartsWith("@$\"") && !Compilation.IsFeatureEnabled(MessageID.IDS_FeatureAltInterpolatedVerbatimStrings)) 37new CSharpRequiredLanguageVersion(MessageID.IDS_FeatureAltInterpolatedVerbatimStrings.RequiredVersion())); 53var newLinesInInterpolationsAllowed = this.Compilation.IsFeatureEnabled(MessageID.IDS_FeatureNewLinesInInterpolations); 86new CSharpRequiredLanguageVersion(MessageID.IDS_FeatureNewLinesInInterpolations.RequiredVersion())); 662CheckFeatureAvailability(syntax, MessageID.IDS_FeatureImprovedInterpolatedStrings, diagnostics); 664else if (!Compilation.IsFeatureEnabled(MessageID.IDS_FeatureImprovedInterpolatedStrings) && diagnostics.AccumulatesDiagnostics) 689CheckFeatureAvailability(value.Syntax, MessageID.IDS_FeatureImprovedInterpolatedStrings, diagnostics); 699CheckFeatureAvailability(value.Syntax, MessageID.IDS_FeatureImprovedInterpolatedStrings, diagnostics);

160MessageID msgId; 163msgId = MessageID.IDS_SK_FIELD; 167msgId = MessageID.IDS_SK_PROPERTY; 175MessageID.IDS_SK_METHOD.Localize()); 1240CheckFeatureAvailability(receiverArgument.Syntax, MessageID.IDS_FeatureRefExtensionMethods, diagnostics); 1246CheckFeatureAvailability(receiverArgument.Syntax, MessageID.IDS_FeatureRefExtensionMethods, diagnostics); 1738MessageID.IDS_FeatureParamsCollections.CheckFeatureAvailability(diagnostics, node); 2222CheckFeatureAvailability(node, MessageID.IDS_FeatureNameof, diagnostics);

61MessageID.IDS_FeatureLambda.CheckFeatureAvailability(diagnostics, lambdaSyntax.ArrowToken); 93MessageID.IDS_FeatureAnonDelegates.CheckFeatureAvailability(diagnostics, anon.DelegateKeyword); 111MessageID.IDS_FeatureAsync.CheckFeatureAvailability(diagnostics, modifier); 116MessageID.IDS_FeatureStaticAnonymousFunction.CheckFeatureAvailability(diagnostics, modifier); 168MessageID.IDS_FeatureLambdaOptionalParameters.CheckFeatureAvailability(diagnostics, p.Default.EqualsToken); 281MessageID.IDS_FeatureLambdaAttributes.CheckFeatureAvailability(diagnostics, attributeList); 294MessageID.IDS_FeatureLambdaReturnType.CheckFeatureAvailability(diagnostics, syntax); 352CheckFeatureAvailability(parameter, MessageID.IDS_FeatureSimpleLambdaParameterModifiers, diagnostics); 375bool allowShadowingNames = binder.Compilation.IsFeatureEnabled(MessageID.IDS_FeatureNameShadowingInNestedFunctions); 393MessageID.IDS_FeatureLambdaDiscardParameters.CheckFeatureAvailability(

1780diagInfo = diagnose ? new CSDiagnosticInfo(ErrorCode.ERR_HasNoTypeVars, namedType, MessageID.IDS_SK_TYPE.Localize()) : null; 1785diagInfo = diagnose ? new CSDiagnosticInfo(ErrorCode.ERR_BadArity, namedType, MessageID.IDS_SK_TYPE.Localize(), namedType.Arity) : null; 1801diagInfo = diagnose ? new CSDiagnosticInfo(ErrorCode.ERR_HasNoTypeVars, method, MessageID.IDS_SK_METHOD.Localize()) : null; 1806diagInfo = diagnose ? new CSDiagnosticInfo(ErrorCode.ERR_BadArity, method, MessageID.IDS_SK_METHOD.Localize(), method.Arity) : null;

100bool allowShadowing = Compilation.IsFeatureEnabled(MessageID.IDS_FeatureNameShadowingInNestedFunctions);

548CheckFeatureAvailability(node, MessageID.IDS_FeatureTupleEquality, diagnostics); 1386Binder.CheckFeatureAvailability(node, MessageID.IDS_DefaultInterfaceImplementation, diagnostics); 2401result = CheckFeatureAvailability(node, MessageID.IDS_FeatureStaticAbstractMembersInInterfaces, diagnostics); 2412result = CheckFeatureAvailability(node, MessageID.IDS_FeatureStaticAbstractMembersInInterfaces, diagnostics); 2420result &= CheckFeatureAvailability(node, MessageID.IDS_FeatureUnsignedRightShift, diagnostics); 2431result &= CheckFeatureAvailability(node, MessageID.IDS_FeatureCheckedUserDefinedOperators, diagnostics); 2435result &= CheckFeatureAvailability(node, MessageID.IDS_FeatureUnsignedRightShift, diagnostics); 2446MessageID.IDS_FeatureNullableReferenceTypes.CheckFeatureAvailability(diagnostics, node.OperatorToken); 3232((CSharpParseOptions)node.SyntaxTree.Options).IsFeatureEnabled(MessageID.IDS_FeaturePatternMatching)) 3279if (wasUnderscore && ((CSharpParseOptions)node.SyntaxTree.Options).IsFeatureEnabled(MessageID.IDS_FeatureRecursivePatterns)) 4036CheckFeatureAvailability(node, MessageID.IDS_FeatureUnconstrainedTypeParameterInNullCoalescingOperator, diagnostics); 4174MessageID.IDS_FeatureCoalesceAssignmentExpression.CheckFeatureAvailability(diagnostics, node.OperatorToken); 4295CheckFeatureAvailability(node, MessageID.IDS_FeatureRefConditional, diagnostics); 4450CheckFeatureAvailability(syntax, MessageID.IDS_FeatureNativeInt, diagnostics); 4466CheckFeatureAvailability(syntax, MessageID.IDS_FeatureNativeInt, diagnostics);

20MessageID.IDS_FeaturePatternMatching.CheckFeatureAvailability(diagnostics, node.IsKeyword); 147MessageID.IDS_FeatureRecursivePatterns.CheckFeatureAvailability(diagnostics, node.SwitchKeyword); 197MessageID.IDS_FeatureParenthesizedPattern.CheckFeatureAvailability(diagnostics, node.OpenParenToken); 295CheckFeatureAvailability(node, MessageID.IDS_FeatureListPattern, diagnostics); 403MessageID.IDS_FeatureRecursivePatterns.CheckFeatureAvailability(diagnostics, node); 445CheckFeatureAvailability(innerExpression, MessageID.IDS_FeatureTypePattern, diagnostics); 574CheckFeatureAvailability(patternExpression, MessageID.IDS_FeatureNullPointerConstantPattern, diagnostics); 630var requiredVersion = MessageID.IDS_FeatureRecursivePatterns.RequiredVersion(); 654if (MessageID.IDS_FeatureSpanCharConstantPattern.CheckFeatureAvailability(diagnostics, Compilation, node.Location)) 773LanguageVersion requiredVersion = MessageID.IDS_FeatureGenericPatternMatching.RequiredVersion(); 888CheckFeatureAvailability(designation, MessageID.IDS_FeatureExpressionVariablesInQueriesAndInitializers, diagnostics); 963MessageID.IDS_FeatureRecursivePatterns.CheckFeatureAvailability(diagnostics, node); 1091MessageID.IDS_FeatureExtendedPropertyPatterns.CheckFeatureAvailability(diagnostics, subPattern.ExpressionColon.ColonToken); 1246if (Compilation.LanguageVersion < MessageID.IDS_FeatureRecursivePatterns.RequiredVersion()) 1324|| (inputType.IsPointerType() && Compilation.LanguageVersion < MessageID.IDS_FeatureRecursivePatterns.RequiredVersion())) 1372MessageID.IDS_FeatureRecursivePatterns.CheckFeatureAvailability(diagnostics, node); 1469MessageID.IDS_FeatureExtendedPropertyPatterns.CheckFeatureAvailability(diagnostics, p.ExpressionColon.ColonToken); 1616MessageID.IDS_FeatureTypePattern.CheckFeatureAvailability(diagnostics, node); 1629MessageID.IDS_FeatureRelationalPattern.CheckFeatureAvailability(diagnostics, node.OperatorToken); 1723MessageID.IDS_FeatureNotPattern.CheckFeatureAvailability(diagnostics, node.OperatorToken); 1787MessageID.IDS_FeatureOrPattern.CheckFeatureAvailability(diagnostics, node.OperatorToken); 1854MessageID.IDS_FeatureAndPattern.CheckFeatureAvailability(diagnostics, node.OperatorToken);

26MessageID.IDS_FeatureQueryExpression.CheckFeatureAvailability(diagnostics, node.FromClause.FromKeyword); 773CheckFeatureAvailability(expression, MessageID.IDS_FeatureExpressionVariablesInQueriesAndInitializers, diagnostics, locals[0].GetFirstLocation()); 949diagnostics.Add(ErrorCode.ERR_BadSKunknown, ultimateReceiver.Syntax.Location, ((BoundNamespaceExpression)ultimateReceiver).NamespaceSymbol, MessageID.IDS_SK_NAMESPACE.Localize()); 954diagnostics.Add(ErrorCode.ERR_QueryNoProvider, node.Location, MessageID.IDS_AnonMethod.Localize(), methodName); 970diagnostics.Add(ErrorCode.ERR_QueryNoProvider, node.Location, MessageID.IDS_SK_METHOD.Localize(), methodName); 982Error(diagnostics, ErrorCode.ERR_BadSKunknown, ultimateReceiver.Syntax, ultimateReceiver.Type, MessageID.IDS_SK_TYVAR.Localize());

49CheckFeatureAvailability(attributeList, MessageID.IDS_FeatureLocalFunctionAttributes, diagnostics); 180CheckFeatureAvailability(node.UnsafeKeyword, MessageID.IDS_FeatureRefUnsafeInIteratorAsync, diagnostics); 217MessageID.IDS_FeatureIterators.CheckFeatureAvailability(diagnostics, statement.YieldKeyword); 222MessageID.IDS_FeatureAsyncStreams.CheckFeatureAvailability( 270else if (InUnsafeRegion && Compilation.IsFeatureEnabled(MessageID.IDS_FeatureRefUnsafeInIteratorAsync)) 396if (Compilation.LanguageVersion < MessageID.IDS_FeatureSwitchExpression.RequiredVersion()) 556MessageID.IDS_FeatureLocalFunctions.CheckFeatureAvailability(diagnostics, node.Identifier); 603MessageID.IDS_FeatureStaticLocalFunctions.CheckFeatureAvailability(diagnostics, modifier); 605MessageID.IDS_FeatureExternLocalFunctions.CheckFeatureAvailability(diagnostics, modifier); 1168return !CheckFeatureAvailability(identifierToken, MessageID.IDS_FeatureRefUnsafeInIteratorAsync, diagnostics); 1289bool extensibleFixedEnabled = ((CSharpParseOptions)initializerOpt.SyntaxTree.Options)?.IsFeatureEnabled(MessageID.IDS_FeatureExtensibleFixedStatement) != false; 1300CheckFeatureAvailability(initializerOpt.Syntax, MessageID.IDS_FeatureExtensibleFixedStatement, diagnostics); 1420MessageID.IDS_FeatureRefReassignment.CheckFeatureAvailability(diagnostics, node.Right.GetFirstToken()); 1622return MessageID.IDS_ArrayAccess.Localize(); 1626return MessageID.IDS_PointerElementAccess.Localize(); 2504syntax.IsFeatureEnabled(MessageID.IDS_FeatureInferredDelegateType)) 3369MessageID.IDS_FeatureExceptionFilter.CheckFeatureAvailability(diagnostics, filter.WhenKeyword); 3567ConstructorDeclarationSyntax or DestructorDeclarationSyntax => MessageID.IDS_FeatureExpressionBodiedDeOrConstructor, 3568AccessorDeclarationSyntax => MessageID.IDS_FeatureExpressionBodiedAccessor, 3569BaseMethodDeclarationSyntax => MessageID.IDS_FeatureExpressionBodiedMethod, 3570IndexerDeclarationSyntax => MessageID.IDS_FeatureExpressionBodiedIndexer, 3571PropertyDeclarationSyntax => MessageID.IDS_FeatureExpressionBodiedProperty, 3575LocalFunctionStatementSyntax => (MessageID?)null, 3682MessageID.IDS_TopLevelStatements.CheckFeatureAvailability(diagnostics, topLevelStatement);

115CheckFeatureAvailability(syntax, MessageID.IDS_FeatureImplicitLocal, diagnostics); 159CheckFeatureAvailability(syntax, MessageID.IDS_FeatureUnmanagedGenericTypeConstraint, diagnostics); 162CheckFeatureAvailability(identifierSyntax, MessageID.IDS_FeatureNotNullGenericTypeConstraint, diagnostics); 340var diagnosticInfo = diagnostics.Add(ErrorCode.ERR_BadSKknown, syntax.Location, syntax, symbol.Symbol.GetKindText(), MessageID.IDS_SK_TYPE.Localize()); 449MessageID.IDS_FeatureFunctionPointers.CheckFeatureAvailability(diagnostics, functionPointerTypeSyntax.DelegateKeyword); 540MessageID.IDS_FeatureNullable.CheckFeatureAvailability(diagnostics, nullableSyntax.QuestionToken); 577MessageID.IDS_FeatureGlobalNamespace.CheckFeatureAvailability(diagnostics, node.Alias); 617var requiredVersion = MessageID.IDS_FeatureDefaultTypeParameterConstraint.RequiredVersion(); 678MessageID.IDS_FeatureTuples.CheckFeatureAvailability(diagnostics, syntax); 733bool includeNullability = Compilation.IsFeatureEnabled(MessageID.IDS_FeatureNullableReferenceTypes); 931if (Compilation.LanguageVersion < MessageID.IDS_FeatureDynamic.RequiredVersion()) 1022CheckFeatureAvailability(node, MessageID.IDS_FeatureNativeInt, diagnostics); 1358var binder = !Compilation.IsFeatureEnabled(MessageID.IDS_FeatureUsingTypeAlias) 1379CheckFeatureAvailability(typeSyntax, MessageID.IDS_FeatureUnboundGenericTypesInNameof, diagnostics); 1399Error(diagnostics, ErrorCode.ERR_BadArity, typeSyntax, type, MessageID.IDS_SK_TYPE.Localize(), typeArgumentsSyntax.Count); 1431Error(diagnostics, ErrorCode.ERR_BadArity, syntax, plainName, MessageID.IDS_MethodGroup.Localize(), typeArgumentsSyntax.Count); 1581bool includeNullability = Compilation.IsFeatureEnabled(MessageID.IDS_FeatureNullableReferenceTypes); 2738internal static bool CheckFeatureAvailability(SyntaxNode syntax, MessageID feature, BindingDiagnosticBag diagnostics, Location? location = null) 2741internal static bool CheckFeatureAvailability(SyntaxToken syntax, MessageID feature, BindingDiagnosticBag diagnostics, bool forceWarning = false) 2744internal static bool CheckFeatureAvailability(SyntaxTree tree, MessageID feature, BindingDiagnosticBag diagnostics, Location location) 2747private static bool CheckFeatureAvailability(SyntaxNode syntax, MessageID feature, DiagnosticBag? diagnostics, Location? location = null) 2750private static bool CheckFeatureAvailability(SyntaxToken syntax, MessageID feature, DiagnosticBag? diagnostics, bool forceWarning = false) 2753private static bool CheckFeatureAvailability(SyntaxTree tree, MessageID feature, DiagnosticBag? diagnostics, Location location) 2759private static bool CheckFeatureAvailability<TData>(SyntaxTree tree, MessageID feature, DiagnosticBag? diagnostics, TData data, Func<TData, Location> getLocation, bool forceWarning = false)

65else if (this.IsIndirectlyInIterator && MessageID.IDS_FeatureRefUnsafeInIteratorAsync.GetFeatureAvailabilityDiagnosticInfo(Compilation) is { } unsafeInIteratorDiagnosticInfo)

17MessageID.IDS_FeatureRecords.CheckFeatureAvailability(diagnostics, syntax.WithKeyword); 32CheckFeatureAvailability(syntax, MessageID.IDS_FeatureWithOnStructs, diagnostics); 36CheckFeatureAvailability(syntax, MessageID.IDS_FeatureWithOnAnonymousTypes, diagnostics);

132MessageID.IDS_FeatureRefUnsafeInIteratorAsync.CheckFeatureAvailability(diagnostics, compilation, errorLocation);

220CheckFeatureAvailability(_syntax.AwaitKeyword, MessageID.IDS_FeatureAsyncStreams, diagnostics); 241var messageId = IsAsync ? MessageID.IDS_FeatureExtensionGetAsyncEnumerator : MessageID.IDS_FeatureExtensionGetEnumerator; 293MessageID.IDS_FeatureRefForEach.CheckFeatureAvailability(diagnostics, typeSyntax); 532CheckFeatureAvailability(foreachKeyword, MessageID.IDS_FeatureRefUnsafeInIteratorAsync, diagnostics); 877CheckFeatureAvailability(collectionExpr.Syntax, MessageID.IDS_FeatureInlineArrays, diagnostics); 1230CheckFeatureAvailability(expr.Syntax, MessageID.IDS_FeatureDisposalPattern, diagnostics); 1273CheckFeatureAvailability(syntax, MessageID.IDS_FeatureRefStructInterfaces, diagnostics); 1451MessageID patternName = isAsync ? MessageID.IDS_FeatureAsyncStreams : MessageID.IDS_Collection; 1487diagnostics.Add(ErrorCode.WRN_PatternIsAmbiguous, collectionSyntax.Location, patternType, MessageID.IDS_Collection.Localize(), 1558diagnostics.Add(ErrorCode.WRN_PatternIsAmbiguous, collectionSyntax.Location, collectionExpr.Type, MessageID.IDS_Collection.Localize(), 1717diagnostics.Add(ErrorCode.WRN_PatternBadSignature, collectionSyntax.Location, enumeratorType, MessageID.IDS_Collection.Localize(), patternMemberCandidate); 1780CheckFeatureAvailability(collectionSyntax, MessageID.IDS_FeatureRefStructInterfaces, diagnostics);

81MessageID.IDS_FeatureRefFor.CheckFeatureAvailability(diagnostics, type);

61CheckFeatureAvailability(exprSyntax, MessageID.IDS_FeatureLockObject, diagnostics);

204var diagInfo = diagnose ? new CSDiagnosticInfo(ErrorCode.ERR_BadSKknown, unwrappedSymbol.Name, unwrappedSymbol.GetKindText(), MessageID.IDS_SK_TYPE.Localize()) : null;

3947return Compilation?.IsFeatureEnabled(MessageID.IDS_FeatureFirstClassSpan) != false;

1705return _compilation?.IsFeatureEnabled(MessageID.IDS_FeatureFirstClassSpan) != false;

1838if (!Compilation.IsFeatureEnabled(MessageID.IDS_FeatureOverloadResolutionPriority)) 2922if (_binder.Compilation.IsFeatureEnabled(MessageID.IDS_FeatureImprovedInterpolatedStrings) && 3445if (Compilation.IsFeatureEnabled(MessageID.IDS_FeatureFirstClassSpan)) 3922if (argRefKind == RefKind.Ref && binder.Compilation.IsFeatureEnabled(MessageID.IDS_FeatureRefReadonlyParameters)) 3969if (compilation.IsFeatureEnabled(MessageID.IDS_FeatureRefReadonlyParameters) &&

1254!(refArg == RefKind.Ref && refParameter == RefKind.In && binder.Compilation.IsFeatureEnabled(MessageID.IDS_FeatureRefReadonlyParameters)) && 1265else if (refArg == RefKind.Ref && refParameter == RefKind.In && !binder.Compilation.IsFeatureEnabled(MessageID.IDS_FeatureRefReadonlyParameters)) 1274new CSharpRequiredLanguageVersion(MessageID.IDS_FeatureRefReadonlyParameters.RequiredVersion()));

36((CSharpParseOptions)SwitchSyntax.SyntaxTree.Options)?.IsFeatureEnabled(MessageID.IDS_FeaturePatternMatching) != false; 403CheckFeatureAvailability(node, MessageID.IDS_FeatureSwitchOnBool, diagnostics);

270MessageID.IDS_FeaturePatternMatching.CheckFeatureAvailability(diagnostics, node.Keyword);

98CheckFeatureAvailability(usingKeyword, MessageID.IDS_FeatureUsingDeclarations, diagnostics); 102CheckFeatureAvailability(awaitKeyword, MessageID.IDS_FeatureAsyncUsing, diagnostics); 204MessageID.IDS_FeatureDisposalPattern.CheckFeatureAvailability(diagnostics, originalBinder.Compilation, syntax.Location); 292CheckFeatureAvailability(syntax, MessageID.IDS_FeatureRefStructInterfaces, diagnostics);

39get { return ConstantValueOpt?.IsNull == true ? MessageID.IDS_NULL.Localize() : base.Display; } 63get { return MessageID.IDS_MethodGroup.Localize(); } 71get { return MessageID.IDS_ThrowExpression.Localize(); } 161=> (Type is null) ? MessageID.IDS_FeatureSwitchExpression.Localize() : base.Display; 167=> (Type is null) ? MessageID.IDS_FeatureTargetTypedConditional.Localize() : base.Display; 173=> (Type is null) ? MessageID.IDS_FeatureCollectionExpressions.Localize() : base.Display;

72public MessageID MessageID { get { return Syntax.Kind() == SyntaxKind.AnonymousMethodExpression ? MessageID.IDS_AnonMethod : MessageID.IDS_Lambda; } } 447public MessageID MessageID { get { return Data.MessageID; } } 572public abstract MessageID MessageID { get; } 1510public override MessageID MessageID { get { return this.UnboundLambda.Syntax.Kind() == SyntaxKind.AnonymousMethodExpression ? MessageID.IDS_AnonMethod : MessageID.IDS_Lambda; } }

208AddDiagnostic(diagnostics, ErrorCode.ERR_SwitchNeedsString, MessageID.IDS_Text.Localize(), "/langversion:"); 280ParseAndResolveReferencePaths(name, valueMemory, baseDirectory, libPaths, MessageID.IDS_LIB_OPTION, diagnostics); 328ParseAndResolveReferencePaths(name, valueMemory, baseDirectory, sourcePaths, MessageID.IDS_REFERENCEPATH_OPTION, diagnostics); 417AddDiagnostic(diagnostics, ErrorCode.ERR_SwitchNeedsString, MessageID.IDS_Text.Localize(), name); 618AddDiagnostic(diagnostics, ErrorCode.ERR_SwitchNeedsString, MessageID.IDS_Text.Localize(), "modulename"); 666AddDiagnostic(diagnostics, ErrorCode.ERR_SwitchNeedsString, MessageID.IDS_Text.Localize(), arg); 679AddDiagnostic(diagnostics, ErrorCode.ERR_SwitchNeedsString, MessageID.IDS_Text.Localize(), arg); 687AddDiagnostic(diagnostics, ErrorCode.ERR_SwitchNeedsString, MessageID.IDS_Text.Localize(), "/doc:"); // Different argument. 699AddDiagnostic(diagnostics, ErrorCode.ERR_SwitchNeedsString, MessageID.IDS_Text.Localize(), "/addmodule:"); 791AddDiagnostic(diagnostics, ErrorCode.ERR_SwitchNeedsString, MessageID.IDS_Text.Localize(), name); 1048AddDiagnostic(diagnostics, ErrorCode.ERR_SwitchNeedsString, MessageID.IDS_Text.Localize(), "keycontainer"); 1110AddDiagnostic(diagnostics, ErrorCode.ERR_SwitchNeedsString, MessageID.IDS_Text.Localize(), "subsystemversion"); 1131AddDiagnostic(diagnostics, ErrorCode.ERR_SwitchNeedsString, MessageID.IDS_Text.Localize(), "touchedfiles"); 1421ParseAndResolveReferencePaths(null, additionalReferenceDirectories.AsMemory(), baseDirectory, libPaths, MessageID.IDS_LIB_ENV, diagnostics); 1536if (nullableContextOptions != NullableContextOptions.Disable && parseOptions.LanguageVersion < MessageID.IDS_FeatureNullableReferenceTypes.RequiredVersion()) 1540new CSharpRequiredLanguageVersion(MessageID.IDS_FeatureNullableReferenceTypes.RequiredVersion())), Location.None)); 1599private static void ParseAndResolveReferencePaths(string? switchName, ReadOnlyMemory<char>? switchValue, string? baseDirectory, List<string> builder, MessageID origin, List<Diagnostic> diagnostics) 1604AddDiagnostic(diagnostics, ErrorCode.ERR_SwitchNeedsString, MessageID.IDS_PathList.Localize(), switchName); 1613AddDiagnostic(diagnostics, ErrorCode.WRN_InvalidSearchPathDir, path, origin.Localize(), MessageID.IDS_DirectoryHasInvalidPath.Localize()); 1617AddDiagnostic(diagnostics, ErrorCode.WRN_InvalidSearchPathDir, path, origin.Localize(), MessageID.IDS_DirectoryDoesNotExist.Localize()); 1858AddDiagnostic(diagnostics, ErrorCode.ERR_SwitchNeedsString, MessageID.IDS_Namespace1.Localize(), arg); 1872AddDiagnostic(diagnostics, ErrorCode.ERR_SwitchNeedsString, MessageID.IDS_Text.Localize(), arg); 1899AddDiagnostic(diagnostics, ErrorCode.ERR_SwitchNeedsString, MessageID.IDS_Text.Localize(), arg);

277consoleOutput.WriteLine(ErrorFacts.GetMessage(MessageID.IDS_LogoLine1, Culture), GetToolName(), GetCompilerVersion()); 278consoleOutput.WriteLine(ErrorFacts.GetMessage(MessageID.IDS_LogoLine2, Culture)); 284consoleOutput.WriteLine(ErrorFacts.GetMessage(MessageID.IDS_LangVersions, Culture)); 316return ErrorFacts.GetMessage(MessageID.IDS_ToolName, Culture); 325consoleOutput.WriteLine(ErrorFacts.GetMessage(MessageID.IDS_CSCHelp, Culture));

2050CheckFeatureAvailability(Candidate.ExtractReturnTypeSyntax(), MessageID.IDS_FeatureAsyncMain, diagnostics)) 2057else if (LanguageVersion >= MessageID.IDS_FeatureAsyncMain.RequiredVersion() && taskEntryPoints.Count > 0) 2991if (Options.NullableContextOptions != NullableContextOptions.Disable && LanguageVersion < MessageID.IDS_FeatureNullableReferenceTypes.RequiredVersion() && 2996new CSharpRequiredLanguageVersion(MessageID.IDS_FeatureNullableReferenceTypes.RequiredVersion())), Location.None));

12internal static bool IsFeatureEnabled(this CSharpCompilation compilation, MessageID feature) 17internal static bool IsFeatureEnabled(this SyntaxNode? syntax, MessageID feature)

298string message = ErrorFacts.GetMessage(MessageID.IDS_XMLIGNORED, CultureInfo.CurrentUICulture); 348string message = ErrorFacts.GetMessage(MessageID.IDS_XMLIGNORED, CultureInfo.CurrentUICulture);

283_diagnostics.Add(ErrorCode.WRN_FailedInclude, location, filePathValue, xpathValue, new LocalizableErrorArgument(MessageID.IDS_OperationCausedStackOverflow)); 286commentMessage = ErrorFacts.GetMessage(MessageID.IDS_XMLNOINCLUDE, CultureInfo.CurrentUICulture); 303var subMessage = hasFileAttribute ? MessageID.IDS_XMLMISSINGINCLUDEPATH.Localize() : MessageID.IDS_XMLMISSINGINCLUDEFILE.Localize(); 305commentMessage = MakeCommentMessage(location, MessageID.IDS_XMLBADINCLUDE); 316commentMessage = MakeCommentMessage(location, MessageID.IDS_XMLFAILEDINCLUDE); 326commentMessage = MakeCommentMessage(location, MessageID.IDS_XMLFAILEDINCLUDE); 347commentMessage = MakeCommentMessage(location, MessageID.IDS_XMLFAILEDINCLUDE); 360commentMessage = MakeCommentMessage(location, MessageID.IDS_XMLFAILEDINCLUDE); 396commentMessage = MakeCommentMessage(location, MessageID.IDS_XMLNOINCLUDE); 409commentMessage = string.Format(ErrorFacts.GetMessage(MessageID.IDS_XMLIGNORED2, CultureInfo.CurrentUICulture), resolvedFilePath); 434private static string MakeCommentMessage(Location location, MessageID messageId)

617_compilation.LanguageVersion >= MessageID.IDS_FeatureNullableReferenceTypes.RequiredVersion() && 1812var isSufficientLangVersion = compilation.LanguageVersion >= MessageID.IDS_FeatureNullableReferenceTypes.RequiredVersion();

259internal bool IsFeatureEnabled(MessageID feature)

480MessageID.IDS_FeatureUsingStatic.CheckFeatureAvailability(diagnostics, usingDirective, usingDirective.StaticKeyword.GetLocation()); 483MessageID.IDS_FeatureGlobalUsing.CheckFeatureAvailability(diagnostics, usingDirective, usingDirective.GlobalKeyword.GetLocation()); 490MessageID.IDS_FeatureExternAlias.CheckFeatureAvailability(diagnostics, externAlias, externAlias.ExternKeyword.GetLocation()); 528MessageID.IDS_FeatureFileScopedNamespace.CheckFeatureAvailability(diagnostics, node, node.NamespaceKeyword.GetLocation()); 728MessageID.IDS_FeatureRecordStructs.CheckFeatureAvailability(diagnostics, record, record.ClassOrStructKeyword.GetLocation()); 741MessageID.IDS_FeaturePrimaryConstructors.CheckFeatureAvailability(diagnostics, node.ParameterList); 746MessageID.IDS_FeaturePrimaryConstructors.CheckFeatureAvailability(diagnostics, node, node.SemicolonToken.GetLocation()); 757MessageID.IDS_FeatureStaticClasses.CheckFeatureAvailability(diagnostics, node, modifier.GetLocation()); 761MessageID.IDS_FeatureReadOnlyStructs.CheckFeatureAvailability(diagnostics, node, modifier.GetLocation()); 765MessageID.IDS_FeatureRefStructs.CheckFeatureAvailability(diagnostics, node, modifier.GetLocation()); 852MessageID.IDS_FeaturePrimaryConstructors.CheckFeatureAvailability(diagnostics, node, node.SemicolonToken.GetLocation());

135public static string GetMessage(MessageID code, CultureInfo culture)

66const MessageID featureId = MessageID.IDS_FeatureNullableReferenceTypes;

305private readonly MessageID _id; 307internal LocalizableErrorArgument(MessageID id) 327public static LocalizableErrorArgument Localize(this MessageID id) 338internal static string? RequiredFeature(this MessageID feature) 349this MessageID feature, 363this MessageID feature, 377this MessageID feature, 391this MessageID feature, 405this MessageID feature, 420this MessageID feature, 435this MessageID feature, 448internal static CSDiagnosticInfo? GetFeatureAvailabilityDiagnosticInfo(this MessageID feature, CSharpParseOptions options) 451internal static CSDiagnosticInfo? GetFeatureAvailabilityDiagnosticInfo(this MessageID feature, CSharpCompilation compilation) 454private static CSDiagnosticInfo GetDisabledFeatureDiagnosticInfo(MessageID feature, LanguageVersion availableVersion) 468internal static LanguageVersion RequiredVersion(this MessageID feature) 479case MessageID.IDS_FeatureFieldKeyword: 480case MessageID.IDS_FeatureFirstClassSpan: 481case MessageID.IDS_FeatureUnboundGenericTypesInNameof: 482case MessageID.IDS_FeatureSimpleLambdaParameterModifiers: 486case MessageID.IDS_FeatureStringEscapeCharacter: // lexer check 487case MessageID.IDS_FeatureImplicitIndexerInitializer: 488case MessageID.IDS_FeatureLockObject: 489case MessageID.IDS_FeatureParamsCollections: 490case MessageID.IDS_FeatureRefUnsafeInIteratorAsync: 491case MessageID.IDS_FeatureRefStructInterfaces: 492case MessageID.IDS_FeatureAllowsRefStructConstraint: 493case MessageID.IDS_FeaturePartialProperties: 494case MessageID.IDS_FeatureOverloadResolutionPriority: 498case MessageID.IDS_FeatureLambdaOptionalParameters: // semantic check 499case MessageID.IDS_FeatureLambdaParamsArray: // semantic check 500case MessageID.IDS_FeaturePrimaryConstructors: // declaration table check 501case MessageID.IDS_FeatureUsingTypeAlias: // semantic check 502case MessageID.IDS_FeatureInstanceMemberInNameof: // semantic check 503case MessageID.IDS_FeatureInlineArrays: // semantic check 504case MessageID.IDS_FeatureCollectionExpressions: // semantic check 505case MessageID.IDS_FeatureRefReadonlyParameters: // semantic check 509case MessageID.IDS_FeatureRawStringLiterals: 510case MessageID.IDS_FeatureStaticAbstractMembersInInterfaces: // semantic check 511case MessageID.IDS_FeatureNewLinesInInterpolations: // semantic check 512case MessageID.IDS_FeatureListPattern: // semantic check 513case MessageID.IDS_FeatureRequiredMembers: // semantic check 514case MessageID.IDS_FeatureCacheStaticMethodGroupConversion: // lowering check 515case MessageID.IDS_FeatureSpanCharConstantPattern: 516case MessageID.IDS_FeatureAutoDefaultStructs: // semantic check 517case MessageID.IDS_FeatureCheckedUserDefinedOperators: // semantic check for declarations, parsing check for doc comments 518case MessageID.IDS_FeatureUtf8StringLiterals: // semantic check 519case MessageID.IDS_FeatureUnsignedRightShift: // semantic check for declarations and consumption, parsing check for doc comments 520case MessageID.IDS_FeatureRelaxedShiftOperator: // semantic check 521case MessageID.IDS_FeatureRefFields: // semantic check 522case MessageID.IDS_FeatureFileTypes: // semantic check 523case MessageID.IDS_FeatureGenericAttributes: // semantic check 527case MessageID.IDS_FeatureMixedDeclarationsAndExpressionsInDeconstruction: // semantic check 528case MessageID.IDS_FeatureSealedToStringInRecord: // semantic check 529case MessageID.IDS_FeatureImprovedInterpolatedStrings: // semantic check 530case MessageID.IDS_FeatureRecordStructs: 531case MessageID.IDS_FeatureWithOnStructs: // semantic check 532case MessageID.IDS_FeatureWithOnAnonymousTypes: // semantic check 533case MessageID.IDS_FeaturePositionalFieldsInRecords: // semantic check 534case MessageID.IDS_FeatureGlobalUsing: 535case MessageID.IDS_FeatureInferredDelegateType: // semantic check 536case MessageID.IDS_FeatureLambdaAttributes: // semantic check 537case MessageID.IDS_FeatureExtendedPropertyPatterns: // semantic check 538case MessageID.IDS_FeatureLambdaReturnType: // semantic check 539case MessageID.IDS_AsyncMethodBuilderOverride: // semantic check 540case MessageID.IDS_FeatureConstantInterpolatedStrings: // semantic check 541case MessageID.IDS_FeatureImplicitImplementationOfNonPublicMembers: // semantic check 542case MessageID.IDS_FeatureFileScopedNamespace: // semantic check 543case MessageID.IDS_FeatureParameterlessStructConstructors: // semantic check 544case MessageID.IDS_FeatureStructFieldInitializers: // semantic check 548case MessageID.IDS_FeatureLambdaDiscardParameters: // semantic check 549case MessageID.IDS_FeatureFunctionPointers: // semantic check 550case MessageID.IDS_FeatureLocalFunctionAttributes: // syntax check 551case MessageID.IDS_FeatureExternLocalFunctions: // semantic check 552case MessageID.IDS_FeatureImplicitObjectCreation: // semantic check 553case MessageID.IDS_FeatureMemberNotNull: 554case MessageID.IDS_FeatureAndPattern: // semantic check 555case MessageID.IDS_FeatureNotPattern: // semantic check 556case MessageID.IDS_FeatureOrPattern: // semantic check 557case MessageID.IDS_FeatureParenthesizedPattern: // semantic check 558case MessageID.IDS_FeatureTypePattern: // semantic check 559case MessageID.IDS_FeatureRelationalPattern: // semantic check 560case MessageID.IDS_FeatureExtensionGetEnumerator: // semantic check 561case MessageID.IDS_FeatureExtensionGetAsyncEnumerator: // semantic check 562case MessageID.IDS_FeatureNativeInt: 563case MessageID.IDS_FeatureExtendedPartialMethods: // semantic check 564case MessageID.IDS_TopLevelStatements: 565case MessageID.IDS_FeatureInitOnlySetters: // semantic check 566case MessageID.IDS_FeatureRecords: // semantic check 567case MessageID.IDS_FeatureTargetTypedConditional: // semantic check 568case MessageID.IDS_FeatureCovariantReturnsForOverrides: // semantic check 569case MessageID.IDS_FeatureStaticAnonymousFunction: // semantic check 570case MessageID.IDS_FeatureModuleInitializers: // semantic check on method attribute 571case MessageID.IDS_FeatureDefaultTypeParameterConstraint: // semantic check 572case MessageID.IDS_FeatureVarianceSafetyForStaticInterfaceMembers: // semantic check 576case MessageID.IDS_FeatureAltInterpolatedVerbatimStrings: // semantic check 577case MessageID.IDS_FeatureCoalesceAssignmentExpression: // semantic check 578case MessageID.IDS_FeatureUnconstrainedTypeParameterInNullCoalescingOperator: 579case MessageID.IDS_FeatureNullableReferenceTypes: // syntax and semantic check 580case MessageID.IDS_FeatureIndexOperator: // semantic check 581case MessageID.IDS_FeatureRangeOperator: // semantic check 582case MessageID.IDS_FeatureAsyncStreams: // semantic check 583case MessageID.IDS_FeatureRecursivePatterns: // semantic check 584case MessageID.IDS_FeatureUsingDeclarations: // semantic check 585case MessageID.IDS_FeatureDisposalPattern: //semantic check 586case MessageID.IDS_FeatureStaticLocalFunctions: // semantic check 587case MessageID.IDS_FeatureNameShadowingInNestedFunctions: 588case MessageID.IDS_FeatureUnmanagedConstructedTypes: // semantic check 589case MessageID.IDS_FeatureObsoleteOnPropertyAccessor: 590case MessageID.IDS_FeatureReadOnlyMembers: 591case MessageID.IDS_DefaultInterfaceImplementation: // semantic check 592case MessageID.IDS_OverrideWithConstraints: // semantic check 593case MessageID.IDS_FeatureNestedStackalloc: // semantic check 594case MessageID.IDS_FeatureNotNullGenericTypeConstraint:// semantic check 595case MessageID.IDS_FeatureSwitchExpression: 596case MessageID.IDS_FeatureAsyncUsing: 597case MessageID.IDS_FeatureNullPointerConstantPattern: //semantic check 601case MessageID.IDS_FeatureAttributesOnBackingFields: // semantic check 602case MessageID.IDS_FeatureImprovedOverloadCandidates: // semantic check 603case MessageID.IDS_FeatureTupleEquality: // semantic check 604case MessageID.IDS_FeatureRefReassignment: // semantic check 605case MessageID.IDS_FeatureRefFor: 606case MessageID.IDS_FeatureRefForEach: // semantic check 607case MessageID.IDS_FeatureEnumGenericTypeConstraint: // semantic check 608case MessageID.IDS_FeatureDelegateGenericTypeConstraint: // semantic check 609case MessageID.IDS_FeatureUnmanagedGenericTypeConstraint: // semantic check 610case MessageID.IDS_FeatureStackAllocInitializer: // semantic check 611case MessageID.IDS_FeatureExpressionVariablesInQueriesAndInitializers: // semantic check 612case MessageID.IDS_FeatureExtensibleFixedStatement: // semantic check 613case MessageID.IDS_FeatureIndexingMovableFixedBuffers: //semantic check 617case MessageID.IDS_FeatureNonTrailingNamedArguments: // semantic check 618case MessageID.IDS_FeatureLeadingDigitSeparator: 619case MessageID.IDS_FeaturePrivateProtected: 620case MessageID.IDS_FeatureReadOnlyReferences: // semantic check 621case MessageID.IDS_FeatureRefStructs: // semantic check 622case MessageID.IDS_FeatureReadOnlyStructs: // semantic check 623case MessageID.IDS_FeatureRefExtensionMethods: 624case MessageID.IDS_FeatureRefConditional: 628case MessageID.IDS_FeatureAsyncMain: 629case MessageID.IDS_FeatureDefaultLiteral: // semantic check 630case MessageID.IDS_FeatureInferredTupleNames: 631case MessageID.IDS_FeatureGenericPatternMatching: 635case MessageID.IDS_FeatureBinaryLiteral: 636case MessageID.IDS_FeatureDigitSeparator: 637case MessageID.IDS_FeatureLocalFunctions: // semantic check 638case MessageID.IDS_FeatureRefLocalsReturns: 639case MessageID.IDS_FeaturePatternMatching: // semantic check 640case MessageID.IDS_FeatureThrowExpression: // semantic check 641case MessageID.IDS_FeatureTuples: 642case MessageID.IDS_FeatureOutVar: // semantic check 643case MessageID.IDS_FeatureExpressionBodiedAccessor: 644case MessageID.IDS_FeatureExpressionBodiedDeOrConstructor: 645case MessageID.IDS_FeatureDiscards: 649case MessageID.IDS_FeatureExceptionFilter: // semantic check 650case MessageID.IDS_FeatureAutoPropertyInitializer: // semantic check 651case MessageID.IDS_FeatureNullPropagatingOperator: // semantic check 652case MessageID.IDS_FeatureExpressionBodiedMethod: 653case MessageID.IDS_FeatureExpressionBodiedProperty: // semantic check 654case MessageID.IDS_FeatureExpressionBodiedIndexer: // semantic check 655case MessageID.IDS_FeatureNameof: 656case MessageID.IDS_FeatureDictionaryInitializer: // semantic check 657case MessageID.IDS_FeatureUsingStatic: // semantic check 658case MessageID.IDS_FeatureInterpolatedStrings: // semantic check 659case MessageID.IDS_AwaitInCatchAndFinally: 660case MessageID.IDS_FeatureReadonlyAutoImplementedProperties: 664case MessageID.IDS_FeatureAsync: // semantic check 668case MessageID.IDS_FeatureDynamic: // Checked in the binder. 669case MessageID.IDS_FeatureTypeVariance: // semantic check 670case MessageID.IDS_FeatureNamedArgument: // semantic check 671case MessageID.IDS_FeatureOptionalParameter: // semantic check 675case MessageID.IDS_FeatureImplicitArray: // semantic check 676case MessageID.IDS_FeatureAnonymousTypes: // semantic check 677case MessageID.IDS_FeatureObjectInitializer: 678case MessageID.IDS_FeatureCollectionInitializer: 679case MessageID.IDS_FeatureLambda: // semantic check 680case MessageID.IDS_FeatureQueryExpression: // semantic check 681case MessageID.IDS_FeatureExtensionMethod: 682case MessageID.IDS_FeaturePartialMethod: // semantic check 683case MessageID.IDS_FeatureImplicitLocal: // Checked in the binder. 684case MessageID.IDS_FeatureAutoImplementedProperties: 688case MessageID.IDS_FeatureGenerics: // Also affects crefs. 689case MessageID.IDS_FeatureAnonDelegates: // semantic check 690case MessageID.IDS_FeatureGlobalNamespace: // Also affects crefs. 691case MessageID.IDS_FeatureFixedBuffer: // semantic check 692case MessageID.IDS_FeatureStaticClasses: // semantic check 693case MessageID.IDS_FeaturePartialTypes: // semantic check 694case MessageID.IDS_FeaturePropertyAccessorMods: 695case MessageID.IDS_FeatureExternAlias: // semantic check 696case MessageID.IDS_FeatureIterators: // semantic check 697case MessageID.IDS_FeatureDefault: // semantic check 698case MessageID.IDS_FeatureNullable: 699case MessageID.IDS_FeaturePragma: // Checked in the directive parser. 700case MessageID.IDS_FeatureSwitchOnBool: // Checked in the binder. 704case MessageID.IDS_FeatureModuleAttrLoc:

96if (compilation.LanguageVersion >= MessageID.IDS_FeatureRecursivePatterns.RequiredVersion())

487if (compilation.IsFeatureEnabled(MessageID.IDS_FeatureAutoDefaultStructs)) 500new CSharpRequiredLanguageVersion(MessageID.IDS_FeatureAutoDefaultStructs.RequiredVersion())); 512if (!compilation.IsFeatureEnabled(MessageID.IDS_FeatureAutoDefaultStructs)) 1293if (compilation.IsFeatureEnabled(MessageID.IDS_FeatureAutoDefaultStructs)) 1302new CSharpRequiredLanguageVersion(MessageID.IDS_FeatureAutoDefaultStructs.RequiredVersion())); 1345else if (compilation.IsFeatureEnabled(MessageID.IDS_FeatureAutoDefaultStructs)) 1358new CSharpRequiredLanguageVersion(MessageID.IDS_FeatureAutoDefaultStructs.RequiredVersion()));

897|| compilation.IsFeatureEnabled(MessageID.IDS_FeatureAutoDefaultStructs))) 1686return compilation.LanguageVersion >= MessageID.IDS_FeatureNullableReferenceTypes.RequiredVersion(); 2425var requiredVersion = MessageID.IDS_FeatureDefaultTypeParameterConstraint.RequiredVersion();

558return self < MessageID.IDS_FeatureInferredTupleNames.RequiredVersion(); 563return self >= MessageID.IDS_FeatureNonTrailingNamedArguments.RequiredVersion(); 568return self >= MessageID.IDS_FeatureAttributesOnBackingFields.RequiredVersion(); 573return self >= MessageID.IDS_FeatureImprovedOverloadCandidates.RequiredVersion();

578if (_factory.Compilation.LanguageVersion >= MessageID.IDS_FeatureCacheStaticMethodGroupConversion.RequiredVersion()

532token = CheckFeatureAvailability(token, MessageID.IDS_FeatureNullableReferenceTypes); 560pragma = CheckFeatureAvailability(pragma, MessageID.IDS_FeaturePragma);

1035operatorToken = CheckFeatureAvailability(operatorToken, MessageID.IDS_FeatureUnsignedRightShift, forceWarning: true); 1117checkedKeyword = CheckFeatureAvailability(checkedKeyword, MessageID.IDS_FeatureCheckedUserDefinedOperators, forceWarning: true); 1326open = CheckFeatureAvailability(open, MessageID.IDS_FeatureGenerics, forceWarning: true); 1390alias = CheckFeatureAvailability(alias, MessageID.IDS_FeatureGlobalNamespace, forceWarning: true);

1432if ((!IsFeatureEnabled(MessageID.IDS_FeatureFileTypes) || forTopLevelStatements) && !ShouldContextualKeywordBeTreatedAsModifier(parsingStatementNotDeclaration: false)) 1455if ((!IsFeatureEnabled(MessageID.IDS_FeatureRequiredMembers) || forTopLevelStatements) && !ShouldContextualKeywordBeTreatedAsModifier(parsingStatementNotDeclaration: false)) 1486return IsFeatureEnabled(MessageID.IDS_FeatureRecords); 1629return IsFeatureEnabled(MessageID.IDS_FeatureRecords); 2390return IsFeatureEnabled(MessageID.IDS_FeatureRecords); 4488IsFeatureEnabled(MessageID.IDS_FeatureExpressionBodiedAccessor) 5774IsFeatureEnabled(MessageID.IDS_FeatureFieldKeyword); 6225open = CheckFeatureAvailability(open, MessageID.IDS_FeatureGenerics); 8681IsFeatureEnabled(MessageID.IDS_FeatureExpressionBodiedAccessor) 10146if (isLambdaParameter && IsFeatureEnabled(MessageID.IDS_FeatureSimpleLambdaParameterModifiers))

800private void CheckFeatureAvailability(MessageID feature) 892CheckFeatureAvailability(MessageID.IDS_FeatureBinaryLiteral); 1048CheckFeatureAvailability(MessageID.IDS_FeatureLeadingDigitSeparator); 1052CheckFeatureAvailability(MessageID.IDS_FeatureDigitSeparator);

155var info = MessageID.IDS_FeatureStringEscapeCharacter.GetFeatureAvailabilityDiagnosticInfo(this.Options);

1139protected TNode CheckFeatureAvailability<TNode>(TNode node, MessageID feature, bool forceWarning = false) 1157protected bool IsFeatureEnabled(MessageID feature)

377MessageID.IDS_FeatureUsingTypeAlias.CheckFeatureAvailability(diagnostics, usingDirective.UnsafeKeyword); 381MessageID.IDS_FeatureUsingTypeAlias.CheckFeatureAvailability(diagnostics, usingDirective.NamespaceOrType); 396if (!DeclaringCompilation.IsFeatureEnabled(MessageID.IDS_FeatureUsingTypeAlias)) 420MessageID.IDS_FeatureUsingTypeAlias.CheckFeatureAvailability(diagnostics, usingDirective.NamespaceOrType);

158Binder.CheckFeatureAvailability(node.Syntax, MessageID.IDS_FeatureConstantInterpolatedStrings, diagnostics);

102Binder.CheckFeatureAvailability(location.SourceTree, MessageID.IDS_FeatureAllowsRefStructConstraint, diagnostics, location); 495bool includeNullability = compilation.IsFeatureEnabled(MessageID.IDS_FeatureNullableReferenceTypes); 534this(currentCompilation, conversions, currentCompilation.IsFeatureEnabled(MessageID.IDS_FeatureNullableReferenceTypes), location, diagnostics) 948if (MessageID.IDS_FeatureAllowsRefStructConstraint.GetFeatureAvailabilityDiagnosticInfo(args.CurrentCompilation) is { } diagnosticInfo) 1005var csDiagnosticInfo = MessageID.IDS_FeatureUnmanagedConstructedTypes.GetFeatureAvailabilityDiagnosticInfo(args.CurrentCompilation);

47return syntax.IsFeatureEnabled(MessageID.IDS_FeatureInferredDelegateType) ?

19private readonly MessageID _messageID; 73public MessageID MessageID { get { return _messageID; } }

403var diagnosticInfo = MessageID.IDS_FeatureLocalFunctionAttributes.GetFeatureAvailabilityDiagnosticInfo((CSharpParseOptions)syntaxReferenceOpt.SyntaxTree.Options);

30modifierErrors |= !MessageID.IDS_FeatureReadOnlyMembers.CheckFeatureAvailability(diagnostics, readonlyToken); 107checkFeature(DeclarationModifiers.PrivateProtected, MessageID.IDS_FeaturePrivateProtected) | 108checkFeature(DeclarationModifiers.Required, MessageID.IDS_FeatureRequiredMembers) | 109checkFeature(DeclarationModifiers.File, MessageID.IDS_FeatureFileTypes) | 110checkFeature(DeclarationModifiers.Async, MessageID.IDS_FeatureAsync); 114bool checkFeature(DeclarationModifiers modifier, MessageID featureID) 122if (MessageID.IDS_FeatureRefFields.GetFeatureAvailabilityDiagnosticInfo((CSharpParseOptions)syntax.SyntaxTree.Options) is { } diagnosticInfo) 167requiredVersion = MessageID.IDS_FeatureStaticAbstractMembersInInterfaces.RequiredVersion(); 180Binder.CheckFeatureAvailability(errorLocation.SourceTree, MessageID.IDS_DefaultInterfaceImplementation, diagnostics, errorLocation); 185requiredVersion = MessageID.IDS_DefaultInterfaceImplementation.RequiredVersion(); 218LanguageVersion requiredVersion = MessageID.IDS_FeatureStaticAbstractMembersInInterfaces.RequiredVersion(); 403var messageId = isForTypeDeclaration ? MessageID.IDS_FeaturePartialTypes : MessageID.IDS_FeaturePartialMethod;

212bool allowShadowingNames = withTypeParametersBinder.Compilation.IsFeatureEnabled(MessageID.IDS_FeatureNameShadowingInNestedFunctions) && 442Binder.CheckFeatureAvailability(modifier, MessageID.IDS_FeatureExtensionMethod, diagnostics); 446Binder.CheckFeatureAvailability(modifier, MessageID.IDS_FeatureRefExtensionMethods, diagnostics); 474Binder.CheckFeatureAvailability(modifier, MessageID.IDS_FeatureRefExtensionMethods, diagnostics); 558MessageID.IDS_FeatureLambdaParamsArray.CheckFeatureAvailability(diagnostics, modifier); 568Binder.CheckFeatureAvailability(modifier, MessageID.IDS_FeatureReadOnlyReferences, diagnostics); 572Binder.CheckFeatureAvailability(modifier, MessageID.IDS_FeatureRefExtensionMethods, diagnostics); 618Binder.CheckFeatureAvailability(modifier, MessageID.IDS_FeatureRefReadonlyParameters, diagnostics);

377MessageID.IDS_FeatureOptionalParameter.CheckFeatureAvailability(diagnostics, defaultSyntax.EqualsToken); 1661MessageID.IDS_FeatureParamsCollections.CheckFeatureAvailability(diagnostics, ParameterSyntax);

151Binder.CheckFeatureAvailability(syntax, MessageID.IDS_DefaultInterfaceImplementation, diagnostics, this.GetFirstLocation());

498if (reportIfContextual(SyntaxKind.RecordKeyword, MessageID.IDS_FeatureRecords, ErrorCode.WRN_RecordNamedDisallowed) 499|| reportIfContextual(SyntaxKind.RequiredKeyword, MessageID.IDS_FeatureRequiredMembers, ErrorCode.ERR_RequiredNameDisallowed) 500|| reportIfContextual(SyntaxKind.FileKeyword, MessageID.IDS_FeatureFileTypes, ErrorCode.ERR_FileTypeNameDisallowed) 501|| reportIfContextual(SyntaxKind.ScopedKeyword, MessageID.IDS_FeatureRefFields, ErrorCode.ERR_ScopedTypeNameDisallowed)) 510bool reportIfContextual(SyntaxKind contextualKind, MessageID featureId, ErrorCode error) 1362Binder.CheckFeatureAvailability(t.DeclaringSyntaxReferences[0].GetSyntax(), MessageID.IDS_DefaultInterfaceImplementation, diagnostics, t.GetFirstLocation()); 2171var methodKind = method1.MethodKind == MethodKind.Constructor ? MessageID.IDS_SK_CONSTRUCTOR : MessageID.IDS_SK_METHOD; 4200MessageID.IDS_FeatureParameterlessStructConstructors.CheckFeatureAvailability(diagnostics, m.DeclaringCompilation, location); 4229MessageID.IDS_FeatureStructFieldInitializers.CheckFeatureAvailability(diagnostics, symbol.DeclaringCompilation, symbol.GetFirstLocation()); 4547if (baseToStringMethod.ContainingModule != this.ContainingModule && !this.DeclaringCompilation.IsFeatureEnabled(MessageID.IDS_FeatureSealedToStringInRecord)) 4550var requiredVersion = MessageID.IDS_FeatureSealedToStringInRecord.RequiredVersion(); 4573MessageID.IDS_FeatureSealedToStringInRecord.CheckFeatureAvailability( 4637Binder.CheckFeatureAvailability(syntax, MessageID.IDS_FeaturePositionalFieldsInRecords, diagnostics);

1004else if (MessageID.IDS_FeatureCovariantReturnsForOverrides.GetFeatureAvailabilityDiagnosticInfo(this.DeclaringCompilation) is { } diagnosticInfo) 1076var diagnosticInfo = MessageID.IDS_FeatureCovariantReturnsForOverrides.GetFeatureAvailabilityDiagnosticInfo(this.DeclaringCompilation); 1201DeclaringCompilation.LanguageVersion >= MessageID.IDS_FeatureCovariantReturnsForOverrides.RequiredVersion()) 1539compilation.IsFeatureEnabled(MessageID.IDS_FeatureNullableReferenceTypes);

209MessageID.IDS_FeatureFixedBuffer.CheckFeatureAvailability(diagnostics, modifier); 373Binder.CheckFeatureAvailability(declarator, MessageID.IDS_DefaultInterfaceImplementation, diagnostics, ErrorLocation); 503MessageID.IDS_FeatureRefFields.CheckFeatureAvailability(diagnostics, compilation, typeSyntax.SkipScoped(out _).Location);

1101Binder.CheckFeatureAvailability(declarationSyntax, MessageID.IDS_DefaultInterfaceImplementation, diagnostics, location);

598MessageID.IDS_FeatureMemberNotNull.CheckFeatureAvailability(diagnostics, arguments.AttributeSyntaxOpt); 603MessageID.IDS_FeatureMemberNotNull.CheckFeatureAvailability(diagnostics, arguments.AttributeSyntaxOpt); 608MessageID.IDS_FeatureModuleInitializers.CheckFeatureAvailability(diagnostics, arguments.AttributeSyntaxOpt); 628MessageID.IDS_FeatureRefStructInterfaces.CheckFeatureAvailability(diagnostics, arguments.AttributeSyntaxOpt); 642MessageID.IDS_FeatureOverloadResolutionPriority.CheckFeatureAvailability(diagnostics, arguments.AttributeSyntaxOpt); 704MessageID.IDS_FeatureObsoleteOnPropertyAccessor.CheckFeatureAvailability(diagnostics, arguments.AttributeSyntaxOpt); 1425diagnostics.Add(ErrorCode.ERR_CannotUseManagedTypeInUnmanagedCallersOnly, syntax.Location, type, (isParam ? MessageID.IDS_Parameter : MessageID.IDS_Return).Localize()); 1552MessageID.IDS_AsyncMethodBuilderOverride.CheckFeatureAvailability(diagnostics, this.DeclaringCompilation, errorLocation);

698bool value = compilation.IsFeatureEnabled(MessageID.IDS_FeatureRefFields) || _assemblySymbol.RuntimeSupportsByRefFields;

178MessageID.IDS_FeatureGenerics.CheckFeatureAvailability(diagnostics, tpl.LessThanToken); 194MessageID.IDS_FeatureTypeVariance.CheckFeatureAvailability(diagnostics, tp.VarianceKeyword);

109MessageID.IDS_FeatureGenericAttributes.CheckFeatureAvailability(diagnostics, this.DeclaringCompilation, baseLocation); 572Binder.CheckFeatureAvailability(typeSyntax, MessageID.IDS_FeatureRefStructInterfaces, diagnostics);

745MessageID.IDS_FeatureUsingTypeAlias.CheckFeatureAvailability(diagnostics, usingDirective, unsafeKeywordLocation); 757if (!compilation.IsFeatureEnabled(MessageID.IDS_FeatureUsingTypeAlias)) 835MessageID.IDS_SK_TYPE_OR_NAMESPACE.Localize());

167syntax.ConstraintClauses[0].WhereKeyword, MessageID.IDS_OverrideWithConstraints, diagnostics); 804Binder.CheckFeatureAvailability(SyntaxNode, MessageID.IDS_FeatureExtendedPartialMethods, diagnostics, location); 1100MessageID.IDS_FeatureGenerics.CheckFeatureAvailability(diagnostics, syntax.TypeParameterList.LessThanToken);

201Binder.CheckFeatureAvailability(syntax, MessageID.IDS_FeatureInitOnlySetters, diagnostics, location); 219MessageID.IDS_FeaturePropertyAccessorMods.CheckFeatureAvailability(diagnostics, modifiers[0]); 465if (!options.IsFeatureEnabled(MessageID.IDS_FeatureReadOnlyMembers))

52((CSharpParseOptions)syntax.SyntaxTree.Options).IsFeatureEnabled(MessageID.IDS_FeatureFieldKeyword)); 150(hasAutoPropertyGet && hasAutoPropertySet ? MessageID.IDS_FeatureAutoImplementedProperties : MessageID.IDS_FeatureFieldKeyword) : 151(hasAutoPropertyGet ? MessageID.IDS_FeatureReadonlyAutoImplementedProperties : MessageID.IDS_FeatureAutoImplementedProperties), 163MessageID.IDS_FeatureAutoPropertyInitializer.CheckFeatureAvailability(diagnostics, initializer.EqualsToken); 453LanguageVersion requiredVersion = MessageID.IDS_FeaturePartialProperties.RequiredVersion();

320if (!property.DeclaringCompilation.IsFeatureEnabled(MessageID.IDS_FeatureFieldKeyword)) 1554MessageID.IDS_FeatureMemberNotNull.CheckFeatureAvailability(diagnostics, arguments.AttributeSyntaxOpt); 1559MessageID.IDS_FeatureMemberNotNull.CheckFeatureAvailability(diagnostics, arguments.AttributeSyntaxOpt); 1575MessageID.IDS_FeatureRefStructInterfaces.CheckFeatureAvailability(diagnostics, arguments.AttributeSyntaxOpt); 1585MessageID.IDS_FeatureOverloadResolutionPriority.CheckFeatureAvailability(diagnostics, arguments.AttributeSyntaxOpt);

30MessageID.IDS_FeatureCheckedUserDefinedOperators.CheckFeatureAvailability(diagnostics, syntax.CheckedKeyword); 90MessageID.IDS_FeatureStaticAbstractMembersInInterfaces.CheckFeatureAvailability(diagnostics, syntax.ExplicitInterfaceSpecifier);

30MessageID.IDS_FeatureCheckedUserDefinedOperators.CheckFeatureAvailability(diagnostics, syntax.CheckedKeyword); 39MessageID.IDS_FeatureUnsignedRightShift.CheckFeatureAvailability(diagnostics, syntax.OperatorToken); 90MessageID.IDS_FeatureStaticAbstractMembersInInterfaces.CheckFeatureAvailability(diagnostics, syntax.ExplicitInterfaceSpecifier);

170LanguageVersion requiredVersion = MessageID.IDS_FeatureStaticAbstractMembersInInterfaces.RequiredVersion(); 193Binder.CheckFeatureAvailability(location.SourceTree, MessageID.IDS_DefaultInterfaceImplementation, diagnostics, location); 730Binder.CheckFeatureAvailability(location.SourceTree, MessageID.IDS_FeatureRelaxedShiftOperator, diagnostics, location);

344MessageID.IDS_FeatureGenericAttributes.CheckFeatureAvailability(diagnostics, attributesToBind[i]); 698diagnostics.Add(ErrorCode.WRN_NonECMAFeature, targetOpt.GetLocation(), MessageID.IDS_FeatureModuleAttrLoc);

21return MessageID.IDS_SK_NAMESPACE.Localize(); 23return MessageID.IDS_SK_TYPE.Localize(); 25return MessageID.IDS_SK_TYVAR.Localize(); 27return MessageID.IDS_SK_ARRAY.Localize(); 29return MessageID.IDS_SK_POINTER.Localize(); 31return MessageID.IDS_SK_FUNCTION_POINTER.Localize(); 33return MessageID.IDS_SK_DYNAMIC.Localize(); 35return MessageID.IDS_SK_METHOD.Localize(); 37return MessageID.IDS_SK_PROPERTY.Localize(); 39return MessageID.IDS_SK_EVENT.Localize(); 41return MessageID.IDS_SK_FIELD.Localize(); 45return MessageID.IDS_SK_VARIABLE.Localize(); 47return MessageID.IDS_SK_ALIAS.Localize(); 49return MessageID.IDS_SK_LABEL.Localize(); 53return MessageID.IDS_SK_UNKNOWN.Localize();

177MessageID.IDS_FeaturePrimaryConstructors.CheckFeatureAvailability(diagnostics, attributeDeclarationSyntax, attributeDeclarationSyntax.Target.Identifier.GetLocation());

181new CSharpRequiredLanguageVersion(MessageID.IDS_FeatureAttributesOnBackingFields.RequiredVersion())),

284new CSharpRequiredLanguageVersion(MessageID.IDS_FeatureInferredTupleNames.RequiredVersion())));

1015LanguageVersion requiredVersion = MessageID.IDS_FeatureImplicitImplementationOfNonPublicMembers.RequiredVersion(); 1637var feature = isStatic ? MessageID.IDS_FeatureStaticAbstractMembersInInterfaces : MessageID.IDS_DefaultInterfaceImplementation; 1740LanguageVersion requiredVersion = MessageID.IDS_FeatureStaticAbstractMembersInInterfaces.RequiredVersion(); 1747MessageID.IDS_FeatureStaticAbstractMembersInInterfaces.Localize(), 1969MessageID.IDS_FeatureRefStructInterfaces.CheckFeatureAvailability(diagnostics, implementingSymbol.DeclaringCompilation, applicationSyntaxReference.GetLocation());

176return MessageID.IDS_FeatureVarianceSafetyForStaticInterfaceMembers.RequiredVersion() <= member.DeclaringCompilation.LanguageVersion; 311diagnostics.AddVarianceError(typeParam, context, locationProvider, locationArg, MessageID.IDS_Invariantly); 317diagnostics.AddVarianceError(typeParam, context, locationProvider, locationArg, MessageID.IDS_Covariantly); 323diagnostics.AddVarianceError(typeParam, context, locationProvider, locationArg, MessageID.IDS_Contravariantly); 445MessageID expectedVariance) 448MessageID actualVariance; 452actualVariance = MessageID.IDS_Contravariant; 455actualVariance = MessageID.IDS_Covariant; 475new CSharpRequiredLanguageVersion(MessageID.IDS_FeatureVarianceSafetyForStaticInterfaceMembers.RequiredVersion()));

274MessageID.IDS_FeatureRefLocalsReturns.CheckFeatureAvailability(diagnostics, refType.RefKeyword); 277MessageID.IDS_FeatureReadOnlyReferences.CheckFeatureAvailability(diagnostics, refType.ReadOnlyKeyword); 328MessageID.IDS_FeatureRefLocalsReturns.CheckFeatureAvailability(diagnostics, refExpression.RefKeyword);