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

736Error(diagnostics, ErrorCode.ERR_BadSKknown, node, ns.NamespaceSymbol, MessageID.IDS_SK_NAMESPACE.Localize(), MessageID.IDS_SK_VARIABLE.Localize()); 741Error(diagnostics, ErrorCode.ERR_BadSKknown, node, type.Type, MessageID.IDS_SK_TYPE.Localize(), MessageID.IDS_SK_VARIABLE.Localize()); 752Error(diagnostics, GetMethodGroupOrFunctionPointerLvalueError(valueKind), node, unconvertedAddressOf.Operand.Name, MessageID.IDS_AddressOfMethodGroup.Localize()); 763Error(diagnostics, GetMethodGroupOrFunctionPointerLvalueError(valueKind), node, methodGroup.Name, MessageID.IDS_MethodGroup.Localize()); 1017Error(diagnostics, ErrorCode.ERR_BadSKknown, expr.Syntax, ((BoundNamespaceExpression)expr).NamespaceSymbol, MessageID.IDS_SK_NAMESPACE.Localize(), MessageID.IDS_SK_VARIABLE.Localize()); 1020Error(diagnostics, ErrorCode.ERR_BadSKunknown, expr.Syntax, expr.Type, MessageID.IDS_SK_TYPE.Localize()); 1035else if (this.IsDirectlyInIterator && Compilation.IsFeatureEnabled(MessageID.IDS_FeatureRefUnsafeInIteratorAsync)) 1772CheckFeatureAvailability(node, MessageID.IDS_FeatureInitOnlySetters, diagnostics); 3092MessageID cause; 3095cause = MessageID.IDS_FOREACHLOCAL; 3099cause = MessageID.IDS_USINGLOCAL; 3103cause = 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); 1512case ManagedKind.UnmanagedWithGenerics when MessageID.IDS_FeatureUnmanagedConstructedTypes.GetFeatureAvailabilityDiagnosticInfo(compilation) is CSDiagnosticInfo diagnosticInfo: 1530MessageID.IDS_FeatureDefault.CheckFeatureAvailability(diagnostics, node.Keyword); 1822CheckFeatureAvailability(node, MessageID.IDS_FeatureDiscards, diagnostics); 2262if (!IsInsideNameof || (EnclosingNameofArgument != node && !node.IsFeatureEnabled(MessageID.IDS_FeatureInstanceMemberInNameof))) 2296CheckFeatureAvailability(node, MessageID.IDS_FeatureInstanceMemberInNameof, diagnostics); 2556CheckFeatureAvailability(node, MessageID.IDS_FeatureIndexOperator, diagnostics); 2597CheckFeatureAvailability(node, MessageID.IDS_FeatureRangeOperator, diagnostics); 2778diagnostics.Add(ErrorCode.ERR_NoExplicitConv, syntax.Location, MessageID.IDS_SK_METHOD.Localize(), targetType); 2952nameString = MessageID.IDS_Lambda.Localize().ToString(); 3087MessageID.IDS_FeatureReadOnlyReferences.CheckFeatureAvailability(diagnostics, argumentSyntax.RefKindKeyword); 3092MessageID.IDS_FeatureOutVar.CheckFeatureAvailability(diagnostics, argumentSyntax.RefKindKeyword); 3170CheckFeatureAvailability(declarationExpression, MessageID.IDS_FeatureExpressionVariablesInQueriesAndInitializers, diagnostics); 3248CheckFeatureAvailability(syntax, MessageID.IDS_FeatureRefUnsafeInIteratorAsync, diagnostics); 3288CheckFeatureAvailability(nameColonSyntax, MessageID.IDS_FeatureNamedArgument, diagnostics); 3335new CSharpRequiredLanguageVersion(MessageID.IDS_FeatureNonTrailingNamedArguments.RequiredVersion())); 3407if (!Compilation.IsFeatureEnabled(MessageID.IDS_FeatureRefReadonlyParameters)) 3414var available = CheckFeatureAvailability(argument.Syntax, MessageID.IDS_FeatureRefReadonlyParameters, diagnostics); 4060MessageID.IDS_FeatureImplicitArray.CheckFeatureAvailability(diagnostics, node.NewKeyword); 4525LanguageVersion requiredVersion = MessageID.IDS_FeatureNestedStackalloc.RequiredVersion(); 4531MessageID.IDS_FeatureNestedStackalloc.CheckFeatureAvailability(diagnostics, node.GetFirstToken()); 4550CheckFeatureAvailability(node, MessageID.IDS_FeatureRefStructs, diagnostics); 4613MessageID.IDS_FeatureStackAllocInitializer.CheckFeatureAvailability(diagnostics, stackAllocKeyword); 5113MessageID.IDS_FeatureImplicitObjectCreation.CheckFeatureAvailability(diagnostics, node.NewKeyword); 5200MessageID.IDS_FeatureCollectionExpressions.CheckFeatureAvailability(diagnostics, syntax, syntax.OpenBracketToken.GetLocation()); 5625MessageID.IDS_FeatureObjectInitializer.CheckFeatureAvailability(diagnostics, initializerSyntax.OpenBraceToken); 5829MessageID.IDS_FeatureDictionaryInitializer.CheckFeatureAvailability(diagnostics, implicitIndexing.ArgumentList.OpenBracketToken); 5927MessageID.IDS_FeatureImplicitIndexerInitializer.CheckFeatureAvailability(diagnostics, implicitIndexer.Syntax); 6200MessageID.IDS_FeatureCollectionInitializer.CheckFeatureAvailability(diagnostics, initializerSyntax.OpenBraceToken); 6261CheckFeatureAvailability(node, MessageID.IDS_FeatureRefStructInterfaces, diagnostics); 7331MessageID.IDS_FeatureRawStringLiterals.CheckFeatureAvailability(diagnostics, node); 7344CheckFeatureAvailability(node, MessageID.IDS_FeatureRawStringLiterals, diagnostics); 7347CheckFeatureAvailability(node, MessageID.IDS_FeatureUtf8StringLiterals, diagnostics); 7644var msgId = ((UnboundLambda)boundLeft).MessageID; 7843CheckFeatureAvailability(boundLeft.Syntax, MessageID.IDS_FeatureStaticAbstractMembersInInterfaces, diagnostics); 7875Compilation.LanguageVersion < MessageID.IDS_FeatureNullableReferenceTypes.RequiredVersion()) 7904Error(diagnostics, ErrorCode.ERR_BadSKunknown, methodGroup.NameSyntax, method, MessageID.IDS_SK_METHOD.Localize()); 8561CheckFeatureAvailability(node, MessageID.IDS_FeatureIndexingMovableFixedBuffers, diagnostics); 8607CheckFeatureAvailability(node, MessageID.IDS_FeatureRefFields, diagnostics); 8816else if (CheckFeatureAvailability(node, MessageID.IDS_FeatureInstanceMemberInNameof, diagnostics)) 9186CheckFeatureAvailability(node, MessageID.IDS_FeatureInlineArrays, diagnostics); 9944_ = MessageID.IDS_FeatureIndexOperator.CheckFeatureAvailability(diagnostics, syntax); 10941MessageID.IDS_FeatureNullPropagatingOperator.CheckFeatureAvailability(diagnostics, node.OperatorToken); 11118var 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);

60MessageID.IDS_FeatureLambda.CheckFeatureAvailability(diagnostics, lambdaSyntax.ArrowToken); 90MessageID.IDS_FeatureAnonDelegates.CheckFeatureAvailability(diagnostics, anon.DelegateKeyword); 108MessageID.IDS_FeatureAsync.CheckFeatureAvailability(diagnostics, modifier); 113MessageID.IDS_FeatureStaticAnonymousFunction.CheckFeatureAvailability(diagnostics, modifier); 158MessageID.IDS_FeatureLambdaOptionalParameters.CheckFeatureAvailability(diagnostics, p.Default.EqualsToken); 269MessageID.IDS_FeatureLambdaAttributes.CheckFeatureAvailability(diagnostics, attributeList); 282MessageID.IDS_FeatureLambdaReturnType.CheckFeatureAvailability(diagnostics, syntax); 383bool allowShadowingNames = binder.Compilation.IsFeatureEnabled(MessageID.IDS_FeatureNameShadowingInNestedFunctions); 401MessageID.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); 1381Binder.CheckFeatureAvailability(node, MessageID.IDS_DefaultInterfaceImplementation, diagnostics); 2396result = CheckFeatureAvailability(node, MessageID.IDS_FeatureStaticAbstractMembersInInterfaces, diagnostics); 2407result = CheckFeatureAvailability(node, MessageID.IDS_FeatureStaticAbstractMembersInInterfaces, diagnostics); 2415result &= CheckFeatureAvailability(node, MessageID.IDS_FeatureUnsignedRightShift, diagnostics); 2426result &= CheckFeatureAvailability(node, MessageID.IDS_FeatureCheckedUserDefinedOperators, diagnostics); 2430result &= CheckFeatureAvailability(node, MessageID.IDS_FeatureUnsignedRightShift, diagnostics); 2441MessageID.IDS_FeatureNullableReferenceTypes.CheckFeatureAvailability(diagnostics, node.OperatorToken); 3227((CSharpParseOptions)node.SyntaxTree.Options).IsFeatureEnabled(MessageID.IDS_FeaturePatternMatching)) 3274if (wasUnderscore && ((CSharpParseOptions)node.SyntaxTree.Options).IsFeatureEnabled(MessageID.IDS_FeatureRecursivePatterns)) 4031CheckFeatureAvailability(node, MessageID.IDS_FeatureUnconstrainedTypeParameterInNullCoalescingOperator, diagnostics); 4169MessageID.IDS_FeatureCoalesceAssignmentExpression.CheckFeatureAvailability(diagnostics, node.OperatorToken); 4290CheckFeatureAvailability(node, MessageID.IDS_FeatureRefConditional, diagnostics); 4445CheckFeatureAvailability(syntax, MessageID.IDS_FeatureNativeInt, diagnostics); 4461CheckFeatureAvailability(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); 601MessageID.IDS_FeatureStaticLocalFunctions.CheckFeatureAvailability(diagnostics, modifier); 603MessageID.IDS_FeatureExternLocalFunctions.CheckFeatureAvailability(diagnostics, modifier); 1166return !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()); 1607return MessageID.IDS_ArrayAccess.Localize(); 1611return MessageID.IDS_PointerElementAccess.Localize(); 2485syntax.IsFeatureEnabled(MessageID.IDS_FeatureInferredDelegateType)) 3348MessageID.IDS_FeatureExceptionFilter.CheckFeatureAvailability(diagnostics, filter.WhenKeyword); 3546ConstructorDeclarationSyntax or DestructorDeclarationSyntax => MessageID.IDS_FeatureExpressionBodiedDeOrConstructor, 3547AccessorDeclarationSyntax => MessageID.IDS_FeatureExpressionBodiedAccessor, 3548BaseMethodDeclarationSyntax => MessageID.IDS_FeatureExpressionBodiedMethod, 3549IndexerDeclarationSyntax => MessageID.IDS_FeatureExpressionBodiedIndexer, 3550PropertyDeclarationSyntax => MessageID.IDS_FeatureExpressionBodiedProperty, 3554LocalFunctionStatementSyntax => (MessageID?)null, 3661MessageID.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) 1378Error(diagnostics, ErrorCode.ERR_BadArity, typeSyntax, type, MessageID.IDS_SK_TYPE.Localize(), typeArgumentsSyntax.Count); 1413Error(diagnostics, ErrorCode.ERR_BadArity, syntax, plainName, MessageID.IDS_MethodGroup.Localize(), typeArgumentsSyntax.Count); 1563bool includeNullability = Compilation.IsFeatureEnabled(MessageID.IDS_FeatureNullableReferenceTypes); 2718internal static bool CheckFeatureAvailability(SyntaxNode syntax, MessageID feature, BindingDiagnosticBag diagnostics, Location? location = null) 2721internal static bool CheckFeatureAvailability(SyntaxToken syntax, MessageID feature, BindingDiagnosticBag diagnostics, bool forceWarning = false) 2724internal static bool CheckFeatureAvailability(SyntaxTree tree, MessageID feature, BindingDiagnosticBag diagnostics, Location location) 2727private static bool CheckFeatureAvailability(SyntaxNode syntax, MessageID feature, DiagnosticBag? diagnostics, Location? location = null) 2730private static bool CheckFeatureAvailability(SyntaxToken syntax, MessageID feature, DiagnosticBag? diagnostics, bool forceWarning = false) 2733private static bool CheckFeatureAvailability(SyntaxTree tree, MessageID feature, DiagnosticBag? diagnostics, Location location) 2739private 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); 530CheckFeatureAvailability(foreachKeyword, MessageID.IDS_FeatureRefUnsafeInIteratorAsync, diagnostics); 875CheckFeatureAvailability(collectionExpr.Syntax, MessageID.IDS_FeatureInlineArrays, diagnostics); 1228CheckFeatureAvailability(expr.Syntax, MessageID.IDS_FeatureDisposalPattern, diagnostics); 1271CheckFeatureAvailability(syntax, MessageID.IDS_FeatureRefStructInterfaces, diagnostics); 1449MessageID patternName = isAsync ? MessageID.IDS_FeatureAsyncStreams : MessageID.IDS_Collection; 1485diagnostics.Add(ErrorCode.WRN_PatternIsAmbiguous, collectionSyntax.Location, patternType, MessageID.IDS_Collection.Localize(), 1556diagnostics.Add(ErrorCode.WRN_PatternIsAmbiguous, collectionSyntax.Location, collectionExpr.Type, MessageID.IDS_Collection.Localize(), 1715diagnostics.Add(ErrorCode.WRN_PatternBadSignature, collectionSyntax.Location, enumeratorType, MessageID.IDS_Collection.Localize(), patternMemberCandidate); 1778CheckFeatureAvailability(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;

3949return Compilation?.IsFeatureEnabled(MessageID.IDS_FeatureFirstClassSpan) != false;

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

1838if (!Compilation.IsFeatureEnabled(MessageID.IDS_OverloadResolutionPriority)) 2914if (_binder.Compilation.IsFeatureEnabled(MessageID.IDS_FeatureImprovedInterpolatedStrings) && 3877if (argRefKind == RefKind.Ref && binder.Compilation.IsFeatureEnabled(MessageID.IDS_FeatureRefReadonlyParameters)) 3924if (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; } } 551public abstract MessageID MessageID { get; } 1489public 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()); 1856AddDiagnostic(diagnostics, ErrorCode.ERR_SwitchNeedsString, MessageID.IDS_Namespace1.Localize(), arg); 1870AddDiagnostic(diagnostics, ErrorCode.ERR_SwitchNeedsString, MessageID.IDS_Text.Localize(), arg); 1897AddDiagnostic(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));

2045CheckFeatureAvailability(Candidate.ExtractReturnTypeSyntax(), MessageID.IDS_FeatureAsyncMain, diagnostics)) 2052else if (LanguageVersion >= MessageID.IDS_FeatureAsyncMain.RequiredVersion() && taskEntryPoints.Count > 0) 2966if (Options.NullableContextOptions != NullableContextOptions.Disable && LanguageVersion < MessageID.IDS_FeatureNullableReferenceTypes.RequiredVersion() && 2971new 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() && 1809var 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;

303private readonly MessageID _id; 305internal LocalizableErrorArgument(MessageID id) 325public static LocalizableErrorArgument Localize(this MessageID id) 336internal static string? RequiredFeature(this MessageID feature) 347this MessageID feature, 361this MessageID feature, 375this MessageID feature, 389this MessageID feature, 403this MessageID feature, 418this MessageID feature, 433this MessageID feature, 446internal static CSDiagnosticInfo? GetFeatureAvailabilityDiagnosticInfo(this MessageID feature, CSharpParseOptions options) 449internal static CSDiagnosticInfo? GetFeatureAvailabilityDiagnosticInfo(this MessageID feature, CSharpCompilation compilation) 452private static CSDiagnosticInfo GetDisabledFeatureDiagnosticInfo(MessageID feature, LanguageVersion availableVersion) 466internal static LanguageVersion RequiredVersion(this MessageID feature) 477case MessageID.IDS_FeatureFieldKeyword: 478case MessageID.IDS_FeatureFirstClassSpan: 482case MessageID.IDS_FeatureStringEscapeCharacter: // lexer check 483case MessageID.IDS_FeatureImplicitIndexerInitializer: 484case MessageID.IDS_FeatureLockObject: 485case MessageID.IDS_FeatureParamsCollections: 486case MessageID.IDS_FeatureRefUnsafeInIteratorAsync: 487case MessageID.IDS_FeatureRefStructInterfaces: 488case MessageID.IDS_FeatureAllowsRefStructConstraint: 489case MessageID.IDS_FeaturePartialProperties: 490case MessageID.IDS_OverloadResolutionPriority: 494case MessageID.IDS_FeatureLambdaOptionalParameters: // semantic check 495case MessageID.IDS_FeatureLambdaParamsArray: // semantic check 496case MessageID.IDS_FeaturePrimaryConstructors: // declaration table check 497case MessageID.IDS_FeatureUsingTypeAlias: // semantic check 498case MessageID.IDS_FeatureInstanceMemberInNameof: // semantic check 499case MessageID.IDS_FeatureInlineArrays: // semantic check 500case MessageID.IDS_FeatureCollectionExpressions: // semantic check 501case MessageID.IDS_FeatureRefReadonlyParameters: // semantic check 505case MessageID.IDS_FeatureRawStringLiterals: 506case MessageID.IDS_FeatureStaticAbstractMembersInInterfaces: // semantic check 507case MessageID.IDS_FeatureNewLinesInInterpolations: // semantic check 508case MessageID.IDS_FeatureListPattern: // semantic check 509case MessageID.IDS_FeatureRequiredMembers: // semantic check 510case MessageID.IDS_FeatureCacheStaticMethodGroupConversion: // lowering check 511case MessageID.IDS_FeatureSpanCharConstantPattern: 512case MessageID.IDS_FeatureAutoDefaultStructs: // semantic check 513case MessageID.IDS_FeatureCheckedUserDefinedOperators: // semantic check for declarations, parsing check for doc comments 514case MessageID.IDS_FeatureUtf8StringLiterals: // semantic check 515case MessageID.IDS_FeatureUnsignedRightShift: // semantic check for declarations and consumption, parsing check for doc comments 516case MessageID.IDS_FeatureRelaxedShiftOperator: // semantic check 517case MessageID.IDS_FeatureRefFields: // semantic check 518case MessageID.IDS_FeatureFileTypes: // semantic check 519case MessageID.IDS_FeatureGenericAttributes: // semantic check 523case MessageID.IDS_FeatureMixedDeclarationsAndExpressionsInDeconstruction: // semantic check 524case MessageID.IDS_FeatureSealedToStringInRecord: // semantic check 525case MessageID.IDS_FeatureImprovedInterpolatedStrings: // semantic check 526case MessageID.IDS_FeatureRecordStructs: 527case MessageID.IDS_FeatureWithOnStructs: // semantic check 528case MessageID.IDS_FeatureWithOnAnonymousTypes: // semantic check 529case MessageID.IDS_FeaturePositionalFieldsInRecords: // semantic check 530case MessageID.IDS_FeatureGlobalUsing: 531case MessageID.IDS_FeatureInferredDelegateType: // semantic check 532case MessageID.IDS_FeatureLambdaAttributes: // semantic check 533case MessageID.IDS_FeatureExtendedPropertyPatterns: // semantic check 534case MessageID.IDS_FeatureLambdaReturnType: // semantic check 535case MessageID.IDS_AsyncMethodBuilderOverride: // semantic check 536case MessageID.IDS_FeatureConstantInterpolatedStrings: // semantic check 537case MessageID.IDS_FeatureImplicitImplementationOfNonPublicMembers: // semantic check 538case MessageID.IDS_FeatureFileScopedNamespace: // semantic check 539case MessageID.IDS_FeatureParameterlessStructConstructors: // semantic check 540case MessageID.IDS_FeatureStructFieldInitializers: // semantic check 544case MessageID.IDS_FeatureLambdaDiscardParameters: // semantic check 545case MessageID.IDS_FeatureFunctionPointers: // semantic check 546case MessageID.IDS_FeatureLocalFunctionAttributes: // syntax check 547case MessageID.IDS_FeatureExternLocalFunctions: // semantic check 548case MessageID.IDS_FeatureImplicitObjectCreation: // semantic check 549case MessageID.IDS_FeatureMemberNotNull: 550case MessageID.IDS_FeatureAndPattern: // semantic check 551case MessageID.IDS_FeatureNotPattern: // semantic check 552case MessageID.IDS_FeatureOrPattern: // semantic check 553case MessageID.IDS_FeatureParenthesizedPattern: // semantic check 554case MessageID.IDS_FeatureTypePattern: // semantic check 555case MessageID.IDS_FeatureRelationalPattern: // semantic check 556case MessageID.IDS_FeatureExtensionGetEnumerator: // semantic check 557case MessageID.IDS_FeatureExtensionGetAsyncEnumerator: // semantic check 558case MessageID.IDS_FeatureNativeInt: 559case MessageID.IDS_FeatureExtendedPartialMethods: // semantic check 560case MessageID.IDS_TopLevelStatements: 561case MessageID.IDS_FeatureInitOnlySetters: // semantic check 562case MessageID.IDS_FeatureRecords: // semantic check 563case MessageID.IDS_FeatureTargetTypedConditional: // semantic check 564case MessageID.IDS_FeatureCovariantReturnsForOverrides: // semantic check 565case MessageID.IDS_FeatureStaticAnonymousFunction: // semantic check 566case MessageID.IDS_FeatureModuleInitializers: // semantic check on method attribute 567case MessageID.IDS_FeatureDefaultTypeParameterConstraint: // semantic check 568case MessageID.IDS_FeatureVarianceSafetyForStaticInterfaceMembers: // semantic check 572case MessageID.IDS_FeatureAltInterpolatedVerbatimStrings: // semantic check 573case MessageID.IDS_FeatureCoalesceAssignmentExpression: // semantic check 574case MessageID.IDS_FeatureUnconstrainedTypeParameterInNullCoalescingOperator: 575case MessageID.IDS_FeatureNullableReferenceTypes: // syntax and semantic check 576case MessageID.IDS_FeatureIndexOperator: // semantic check 577case MessageID.IDS_FeatureRangeOperator: // semantic check 578case MessageID.IDS_FeatureAsyncStreams: // semantic check 579case MessageID.IDS_FeatureRecursivePatterns: // semantic check 580case MessageID.IDS_FeatureUsingDeclarations: // semantic check 581case MessageID.IDS_FeatureDisposalPattern: //semantic check 582case MessageID.IDS_FeatureStaticLocalFunctions: // semantic check 583case MessageID.IDS_FeatureNameShadowingInNestedFunctions: 584case MessageID.IDS_FeatureUnmanagedConstructedTypes: // semantic check 585case MessageID.IDS_FeatureObsoleteOnPropertyAccessor: 586case MessageID.IDS_FeatureReadOnlyMembers: 587case MessageID.IDS_DefaultInterfaceImplementation: // semantic check 588case MessageID.IDS_OverrideWithConstraints: // semantic check 589case MessageID.IDS_FeatureNestedStackalloc: // semantic check 590case MessageID.IDS_FeatureNotNullGenericTypeConstraint:// semantic check 591case MessageID.IDS_FeatureSwitchExpression: 592case MessageID.IDS_FeatureAsyncUsing: 593case MessageID.IDS_FeatureNullPointerConstantPattern: //semantic check 597case MessageID.IDS_FeatureAttributesOnBackingFields: // semantic check 598case MessageID.IDS_FeatureImprovedOverloadCandidates: // semantic check 599case MessageID.IDS_FeatureTupleEquality: // semantic check 600case MessageID.IDS_FeatureRefReassignment: // semantic check 601case MessageID.IDS_FeatureRefFor: 602case MessageID.IDS_FeatureRefForEach: // semantic check 603case MessageID.IDS_FeatureEnumGenericTypeConstraint: // semantic check 604case MessageID.IDS_FeatureDelegateGenericTypeConstraint: // semantic check 605case MessageID.IDS_FeatureUnmanagedGenericTypeConstraint: // semantic check 606case MessageID.IDS_FeatureStackAllocInitializer: // semantic check 607case MessageID.IDS_FeatureExpressionVariablesInQueriesAndInitializers: // semantic check 608case MessageID.IDS_FeatureExtensibleFixedStatement: // semantic check 609case MessageID.IDS_FeatureIndexingMovableFixedBuffers: //semantic check 613case MessageID.IDS_FeatureNonTrailingNamedArguments: // semantic check 614case MessageID.IDS_FeatureLeadingDigitSeparator: 615case MessageID.IDS_FeaturePrivateProtected: 616case MessageID.IDS_FeatureReadOnlyReferences: // semantic check 617case MessageID.IDS_FeatureRefStructs: // semantic check 618case MessageID.IDS_FeatureReadOnlyStructs: // semantic check 619case MessageID.IDS_FeatureRefExtensionMethods: 620case MessageID.IDS_FeatureRefConditional: 624case MessageID.IDS_FeatureAsyncMain: 625case MessageID.IDS_FeatureDefaultLiteral: // semantic check 626case MessageID.IDS_FeatureInferredTupleNames: 627case MessageID.IDS_FeatureGenericPatternMatching: 631case MessageID.IDS_FeatureBinaryLiteral: 632case MessageID.IDS_FeatureDigitSeparator: 633case MessageID.IDS_FeatureLocalFunctions: // semantic check 634case MessageID.IDS_FeatureRefLocalsReturns: 635case MessageID.IDS_FeaturePatternMatching: // semantic check 636case MessageID.IDS_FeatureThrowExpression: // semantic check 637case MessageID.IDS_FeatureTuples: 638case MessageID.IDS_FeatureOutVar: // semantic check 639case MessageID.IDS_FeatureExpressionBodiedAccessor: 640case MessageID.IDS_FeatureExpressionBodiedDeOrConstructor: 641case MessageID.IDS_FeatureDiscards: 645case MessageID.IDS_FeatureExceptionFilter: // semantic check 646case MessageID.IDS_FeatureAutoPropertyInitializer: // semantic check 647case MessageID.IDS_FeatureNullPropagatingOperator: // semantic check 648case MessageID.IDS_FeatureExpressionBodiedMethod: 649case MessageID.IDS_FeatureExpressionBodiedProperty: // semantic check 650case MessageID.IDS_FeatureExpressionBodiedIndexer: // semantic check 651case MessageID.IDS_FeatureNameof: 652case MessageID.IDS_FeatureDictionaryInitializer: // semantic check 653case MessageID.IDS_FeatureUsingStatic: // semantic check 654case MessageID.IDS_FeatureInterpolatedStrings: // semantic check 655case MessageID.IDS_AwaitInCatchAndFinally: 656case MessageID.IDS_FeatureReadonlyAutoImplementedProperties: 660case MessageID.IDS_FeatureAsync: // semantic check 664case MessageID.IDS_FeatureDynamic: // Checked in the binder. 665case MessageID.IDS_FeatureTypeVariance: // semantic check 666case MessageID.IDS_FeatureNamedArgument: // semantic check 667case MessageID.IDS_FeatureOptionalParameter: // semantic check 671case MessageID.IDS_FeatureImplicitArray: // semantic check 672case MessageID.IDS_FeatureAnonymousTypes: // semantic check 673case MessageID.IDS_FeatureObjectInitializer: 674case MessageID.IDS_FeatureCollectionInitializer: 675case MessageID.IDS_FeatureLambda: // semantic check 676case MessageID.IDS_FeatureQueryExpression: // semantic check 677case MessageID.IDS_FeatureExtensionMethod: 678case MessageID.IDS_FeaturePartialMethod: // semantic check 679case MessageID.IDS_FeatureImplicitLocal: // Checked in the binder. 680case MessageID.IDS_FeatureAutoImplementedProperties: 684case MessageID.IDS_FeatureGenerics: // Also affects crefs. 685case MessageID.IDS_FeatureAnonDelegates: // semantic check 686case MessageID.IDS_FeatureGlobalNamespace: // Also affects crefs. 687case MessageID.IDS_FeatureFixedBuffer: // semantic check 688case MessageID.IDS_FeatureStaticClasses: // semantic check 689case MessageID.IDS_FeaturePartialTypes: // semantic check 690case MessageID.IDS_FeaturePropertyAccessorMods: 691case MessageID.IDS_FeatureExternAlias: // semantic check 692case MessageID.IDS_FeatureIterators: // semantic check 693case MessageID.IDS_FeatureDefault: // semantic check 694case MessageID.IDS_FeatureNullable: 695case MessageID.IDS_FeaturePragma: // Checked in the directive parser. 696case MessageID.IDS_FeatureSwitchOnBool: // Checked in the binder. 700case 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()));

896|| compilation.IsFeatureEnabled(MessageID.IDS_FeatureAutoDefaultStructs))) 1625return compilation.LanguageVersion >= MessageID.IDS_FeatureNullableReferenceTypes.RequiredVersion(); 2364var 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();

580if (_factory.Compilation.LanguageVersion >= MessageID.IDS_FeatureCacheStaticMethodGroupConversion.RequiredVersion()

540token = CheckFeatureAvailability(token, MessageID.IDS_FeatureNullableReferenceTypes); 568pragma = 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); 2372return IsFeatureEnabled(MessageID.IDS_FeatureRecords); 4470IsFeatureEnabled(MessageID.IDS_FeatureExpressionBodiedAccessor) 5729IsFeatureEnabled(MessageID.IDS_FeatureFieldKeyword); 6171open = CheckFeatureAvailability(open, MessageID.IDS_FeatureGenerics); 8627IsFeatureEnabled(MessageID.IDS_FeatureExpressionBodiedAccessor)

796private void CheckFeatureAvailability(MessageID feature) 888CheckFeatureAvailability(MessageID.IDS_FeatureBinaryLiteral); 1044CheckFeatureAvailability(MessageID.IDS_FeatureLeadingDigitSeparator); 1048CheckFeatureAvailability(MessageID.IDS_FeatureDigitSeparator);

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

1132protected TNode CheckFeatureAvailability<TNode>(TNode node, MessageID feature, bool forceWarning = false) 1150protected 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; } }

397var 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); 563Binder.CheckFeatureAvailability(modifier, MessageID.IDS_FeatureReadOnlyReferences, diagnostics); 567Binder.CheckFeatureAvailability(modifier, MessageID.IDS_FeatureRefExtensionMethods, diagnostics); 613Binder.CheckFeatureAvailability(modifier, MessageID.IDS_FeatureRefReadonlyParameters, diagnostics);

376MessageID.IDS_FeatureOptionalParameter.CheckFeatureAvailability(diagnostics, defaultSyntax.EqualsToken); 1655MessageID.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()); 2160var methodKind = method1.MethodKind == MethodKind.Constructor ? MessageID.IDS_SK_CONSTRUCTOR : MessageID.IDS_SK_METHOD; 4111MessageID.IDS_FeatureParameterlessStructConstructors.CheckFeatureAvailability(diagnostics, m.DeclaringCompilation, location); 4140MessageID.IDS_FeatureStructFieldInitializers.CheckFeatureAvailability(diagnostics, symbol.DeclaringCompilation, symbol.GetFirstLocation()); 4458if (baseToStringMethod.ContainingModule != this.ContainingModule && !this.DeclaringCompilation.IsFeatureEnabled(MessageID.IDS_FeatureSealedToStringInRecord)) 4461var requiredVersion = MessageID.IDS_FeatureSealedToStringInRecord.RequiredVersion(); 4484MessageID.IDS_FeatureSealedToStringInRecord.CheckFeatureAvailability( 4548Binder.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()) 1527compilation.IsFeatureEnabled(MessageID.IDS_FeatureNullableReferenceTypes);

199MessageID.IDS_FeatureFixedBuffer.CheckFeatureAvailability(diagnostics, modifier); 363Binder.CheckFeatureAvailability(declarator, MessageID.IDS_DefaultInterfaceImplementation, diagnostics, ErrorLocation); 493MessageID.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); 623MessageID.IDS_FeatureRefStructInterfaces.CheckFeatureAvailability(diagnostics, arguments.AttributeSyntaxOpt); 637MessageID.IDS_OverloadResolutionPriority.CheckFeatureAvailability(diagnostics, arguments.AttributeSyntaxOpt); 699MessageID.IDS_FeatureObsoleteOnPropertyAccessor.CheckFeatureAvailability(diagnostics, arguments.AttributeSyntaxOpt); 1419diagnostics.Add(ErrorCode.ERR_CannotUseManagedTypeInUnmanagedCallersOnly, syntax.Location, type, (isParam ? MessageID.IDS_Parameter : MessageID.IDS_Return).Localize()); 1546MessageID.IDS_AsyncMethodBuilderOverride.CheckFeatureAvailability(diagnostics, this.DeclaringCompilation, errorLocation);

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

177MessageID.IDS_FeatureGenerics.CheckFeatureAvailability(diagnostics, tpl.LessThanToken); 193MessageID.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();

319if (!property.DeclaringCompilation.IsFeatureEnabled(MessageID.IDS_FeatureFieldKeyword)) 1561MessageID.IDS_FeatureMemberNotNull.CheckFeatureAvailability(diagnostics, arguments.AttributeSyntaxOpt); 1566MessageID.IDS_FeatureMemberNotNull.CheckFeatureAvailability(diagnostics, arguments.AttributeSyntaxOpt); 1577MessageID.IDS_FeatureRefStructInterfaces.CheckFeatureAvailability(diagnostics, arguments.AttributeSyntaxOpt); 1587MessageID.IDS_OverloadResolutionPriority.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);