464private const BindValueKind ValueKindSignificantBitsMask = unchecked((BindValueKind)~((1 << ValueKindInsignificantBits) - 1)); 569private static bool RequiresRValueOnly(BindValueKind kind) 571return (kind & ValueKindSignificantBitsMask) == BindValueKind.RValue; 574private static bool RequiresAssignmentOnly(BindValueKind kind) 576return (kind & ValueKindSignificantBitsMask) == BindValueKind.Assignable; 579private static bool RequiresVariable(BindValueKind kind) 584private static bool RequiresReferenceToLocation(BindValueKind kind) 586return (kind & BindValueKind.RefersToLocation) != 0; 589private static bool RequiresAssignableVariable(BindValueKind kind) 591return (kind & BindValueKind.Assignable) != 0; 594private static bool RequiresRefAssignableVariable(BindValueKind kind) 596return (kind & BindValueKind.RefAssignable) != 0; 599private static bool RequiresRefOrOut(BindValueKind kind) 601return (kind & BindValueKind.RefOrOut) == BindValueKind.RefOrOut; 606private static AccessorKind GetIndexerAccessorKind(BoundIndexerAccess indexerAccess, BindValueKind valueKind) 616private static AccessorKind GetAccessorKind(BindValueKind valueKind) 618var coreValueKind = valueKind & ValueKindSignificantBitsMask; 621BindValueKind.CompoundAssignment => AccessorKind.Both, 622BindValueKind.Assignable => AccessorKind.Set, 627private BoundIndexerAccess BindIndexerDefaultArgumentsAndParamsCollection(BoundIndexerAccess indexerAccess, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 629var coreValueKind = valueKind & ValueKindSignificantBitsMask; 632var useSetAccessor = coreValueKind == BindValueKind.Assignable && indexer.RefKind != RefKind.Ref; 728private BoundExpression CheckValue(BoundExpression expr, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 743Debug.Assert(expr.Syntax.Kind() != SyntaxKind.Argument || valueKind == BindValueKind.RefOrOut); 748Debug.Assert(valueKind == BindValueKind.RefOrOut); 752Debug.Assert(valueKind is (BindValueKind.Assignable or BindValueKind.RefOrOut or BindValueKind.RefAssignable) || diagnostics.DiagnosticBag is null || diagnostics.HasAnyResolvedErrors()); 820if (valueKind == BindValueKind.RValue) 827if ((valueKind & BindValueKind.RefersToLocation) == BindValueKind.RefersToLocation) 835if ((valueKind & BindValueKind.RefersToLocation) == BindValueKind.RefersToLocation) 849if (expr.Kind == BoundKind.MethodGroup && valueKind != BindValueKind.RValueOrMethodGroup) 899expr.HasAnyErrors && valueKind == BindValueKind.RValueOrMethodGroup) 904var resultKind = (valueKind == BindValueKind.RValue || valueKind == BindValueKind.RValueOrMethodGroup) ? 936internal bool CheckValueKind(SyntaxNode node, BoundExpression expr, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 994case BoundKind.MethodGroup when valueKind == BindValueKind.AddressOf: 1220bool checkArrayAccessValueKind(SyntaxNode node, BindValueKind valueKind, ImmutableArray<BoundExpression> indices, BindingDiagnosticBag diagnostics) 1242private static void ReportThisLvalueError(SyntaxNode node, BindValueKind valueKind, bool isValueType, bool isPrimaryConstructorParameter, BindingDiagnosticBag diagnostics) 1297private void CheckAddressOfInAsyncOrIteratorMethod(SyntaxNode node, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 1299if (valueKind == BindValueKind.AddressOf) 1312private bool CheckLocalValueKind(SyntaxNode node, BoundLocal local, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1402private bool CheckParameterValueKind(SyntaxNode node, BoundParameter parameter, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1404Debug.Assert(!RequiresAssignableVariable(BindValueKind.AddressOf)); 1465static void reportReadOnlyParameterError(ParameterSymbol parameterSymbol, SyntaxNode node, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1469Debug.Assert(valueKind != BindValueKind.AddressOf); // If this assert fails, we probably should report ErrorCode.ERR_InvalidAddrOp 1475if (valueKind == BindValueKind.RefReturn) 1494if (valueKind == BindValueKind.RefReturn) 1610private bool CheckFieldValueKind(SyntaxNode node, BoundFieldAccess fieldAccess, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1655Debug.Assert(valueKind == BindValueKind.RefAssignable); 1672return CheckIsValidReceiverForVariable(node, fieldAccess.ReceiverOpt, BindValueKind.Assignable, diagnostics); 1758private bool CheckSimpleAssignmentValueKind(SyntaxNode node, BoundAssignmentOperator assignment, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 1837private bool CheckEventValueKind(BoundEventAccess boundEvent, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 1849if (valueKind == BindValueKind.CompoundAssignment) 1878if (!CheckIsValidReceiverForVariable(eventSyntax, receiver, BindValueKind.Assignable, diagnostics)) 1885if (eventSymbol.IsWindowsRuntimeEvent && valueKind != BindValueKind.Assignable) 1889if (valueKind == BindValueKind.RefOrOut) 1910private bool CheckIsValidReceiverForVariable(SyntaxNode node, BoundExpression receiver, BindValueKind kind, BindingDiagnosticBag diagnostics) 1945BindValueKind valueKind, 1986private bool CheckPropertyValueKind(SyntaxNode node, BoundExpression expr, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 2013else if (valueKind == BindValueKind.RefOrOut) 2085var setValueKind = setMethod.IsEffectivelyReadOnly ? BindValueKind.RValue : BindValueKind.Assignable; 3434private static void ReportReadonlyLocalError(SyntaxNode node, LocalSymbol local, BindValueKind kind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 3437Debug.Assert(kind != BindValueKind.RValue); 3472private static ErrorCode GetThisLvalueError(BindValueKind kind, bool isValueType, bool isPrimaryConstructorParameter) 3476case BindValueKind.CompoundAssignment: 3477case BindValueKind.NullCoalescingAssignment: 3478case BindValueKind.Assignable: 3481case BindValueKind.RefOrOut: 3484case BindValueKind.AddressOf: 3487case BindValueKind.IncrementDecrement: 3490case BindValueKind.RefReturn: 3491case BindValueKind.ReadonlyRef: 3494case BindValueKind.RefAssignable: 3506private static ErrorCode GetRangeLvalueError(BindValueKind kind) 3510case BindValueKind.Assignable: 3511case BindValueKind.CompoundAssignment: 3512case BindValueKind.IncrementDecrement: 3513case BindValueKind.NullCoalescingAssignment: 3516case BindValueKind.AddressOf: 3519case BindValueKind.RefReturn: 3520case BindValueKind.ReadonlyRef: 3523case BindValueKind.RefAssignable: 3535private static ErrorCode GetMethodGroupOrFunctionPointerLvalueError(BindValueKind valueKind) 3546private static ErrorCode GetStandardLvalueError(BindValueKind kind) 3550case BindValueKind.CompoundAssignment: 3551case BindValueKind.NullCoalescingAssignment: 3552case BindValueKind.Assignable: 3555case BindValueKind.AddressOf: 3558case BindValueKind.IncrementDecrement: 3561case BindValueKind.FixedReceiver: 3564case BindValueKind.RefReturn: 3565case BindValueKind.ReadonlyRef: 3568case BindValueKind.RefAssignable: 3596private static void ReportReadOnlyFieldError(FieldSymbol field, SyntaxNode node, BindValueKind kind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 3604Debug.Assert(kind != BindValueKind.AddressOf); // If this assert fails, we probably should report ErrorCode.ERR_InvalidAddrOp 3621int index = (checkingReceiver ? 6 : 0) + (field.IsStatic ? 3 : 0) + (kind == BindValueKind.RefReturn ? 0 : (RequiresRefOrOut(kind) ? 1 : 2)); 3632private static void ReportReadOnlyError(Symbol symbol, SyntaxNode node, BindValueKind kind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 3639if (kind == BindValueKind.AddressOf) 3657int index = (checkingReceiver ? 3 : 0) + (kind == BindValueKind.RefReturn ? 0 : (RequiresRefOrOut(kind) ? 1 : 2));

569BoundExpression namedArgumentValue = this.BindValue(namedArgument.Expression, diagnostics, BindValueKind.RValue);

648qualified = CheckValue(qualified, BindValueKind.RValue, diagnostics);

532if (CheckValueKind(syntax, source, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 547if (CheckValueKind(syntax, source, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded))

99BoundExpression boundRight = rightPlaceholder ?? BindValue(right, deconstructionDiagnostics, BindValueKind.RValue); 660memberAccess = CheckValue(memberAccess, BindValueKind.RValueOrMethodGroup, diagnostics); 794var checkedVariable = CheckValue(boundVariable, BindValueKind.Assignable, diagnostics);

260internal BoundExpression BindValue(ExpressionSyntax node, BindingDiagnosticBag diagnostics, BindValueKind valueKind) 268return BindToNaturalType(BindValue(node, diagnostics, BindValueKind.RValue), diagnostics, reportNoTargetType); 285return CheckValue(valueOrType, BindValueKind.RValue, diagnostics); 467internal BoundExpression BindValueAllowArgList(ExpressionSyntax node, BindingDiagnosticBag diagnostics, BindValueKind valueKind) 512BindValueKind valueKind; 545valueBeforeConversion = defaultValueBinder.BindValue(defaultValueSyntax.Value, diagnostics, BindValueKind.RValue); 563var initializer = initializerBinder.BindValue(equalsValueSyntax.Value, diagnostics, BindValueKind.RValue); 896node, LookupResultKind.Empty, ImmutableArray<Symbol>.Empty, ImmutableArray.Create<BoundExpression>(BindToTypeForErrorRecovery(BindValue(node.Expression, BindingDiagnosticBag.Discarded, BindValueKind.RefersToLocation))), 1048ImmutableArray.Create(BindValue(arguments[0].Expression, diagnostics, BindValueKind.RValue)) : 1078BoundExpression boundArgument = BindValue(argumentSyntax.Expression, diagnostics, BindValueKind.RValue); 1259BoundExpression argument = BindValue(node.Expression, diagnostics, BindValueKind.RValue); 1282BoundExpression argument = this.BindValue(node.Expression, diagnostics, BindValueKind.RefOrOut); 1307BoundExpression argument = BindValue(node.Expression, diagnostics, BindValueKind.RValue); 2663BoundExpression operand = this.BindValue(node.Expression, diagnostics, BindValueKind.RValue); 2688BoundExpression boundOperand = BindValue(node.Operand, diagnostics, BindValueKind.RValue); 2796BoundExpression boundOperand = BindValue(operand, diagnostics, BindValueKind.RValue); 3199var requiredValueKind = origRefKind == RefKind.In ? BindValueKind.ReadonlyRef : BindValueKind.RefOrOut; 3480BindValueKind valueKind = 3482BindValueKind.RValue : 3484BindValueKind.ReadonlyRef : 3485BindValueKind.RefOrOut; 4018if (!this.CheckValueKind(argument.Syntax, argument, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 4030if (this.CheckValueKind(argument.Syntax, argument, BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 4183var size = BindValue(dimension, diagnostics, BindValueKind.RValue); 4299var boundExpression = BindValue(expression, diagnostics, BindValueKind.RValue); 4316var boundExpression = BindValue(expression, diagnostics, BindValueKind.RValue); 4645count = BindValue(countSyntax, diagnostics, BindValueKind.RValue); 5388ExpressionElementSyntax expressionElementSyntax => @this.BindValue(expressionElementSyntax.Expression, diagnostics, BindValueKind.RValue), 5829BindValueKind rhsValueKind, 5841Debug.Assert(rhsValueKind == BindValueKind.RValue); 5910var rhsKind = isRef ? GetRequiredRHSValueKindForRefAssignment(boundLeft) : BindValueKind.RValue; 5956var boundExpression = BindValue(memberInitializer, diagnostics, BindValueKind.RValue); 5971BindValueKind valueKind = isRhsNestedInitializer ? BindValueKind.RValue : (isRef ? BindValueKind.RefAssignable : BindValueKind.Assignable); 5984leftSyntax, implicitReceiver, BindValueKind.Assignable, false, diagnostics); 5991BindValueKind valueKind, 6232BindValueKind valueKind, 6266return ToBadExpression(boundMember, (valueKind == BindValueKind.RValue) ? LookupResultKind.NotAValue : LookupResultKind.NotAVariable); 6520var boundElementInitializer = BindInitializerExpressionOrValue(elementInitializer, initializerType, BindValueKind.RValue, implicitReceiver.Syntax, diagnostics); 6549exprBuilder.Add(BindValue(childElementInitializer, diagnostics, BindValueKind.RValue)); 7927boundLeft = CheckValue(boundLeft, BindValueKind.RValue, diagnostics); 8037boundLeft = CheckValue(boundLeft, BindValueKind.RValue, diagnostics); 9408lengthOrCountAccess = binder.CheckValue(lengthOrCountAccess, BindValueKind.RValue, diagnostics); 9864hasError = !CheckValueKind(node, receiver, BindValueKind.FixedReceiver, checkingReceiver: false, diagnostics: diagnostics); 10320receiver = CheckValue(receiver, BindValueKind.RValue, diagnostics); 10450if (CheckValueKind(node, expr, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 10462if (!CheckValueKind(node, expr, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 11504lengthOrCountAccess = CheckValue(lengthOrCountAccess, BindValueKind.RValue, diagnostics); 12344var access = conditionalAccessBinder.BindValue(node.WhenNotNull, diagnostics, BindValueKind.RValue);

90var value = BindValue(interpolation.Expression, diagnostics, BindValueKind.RValue); 101alignment = GenerateConversionForAssignment(intType, BindValue(interpolation.AlignmentClause.Value, diagnostics, Binder.BindValueKind.RValue), diagnostics);

126boundExpression = CheckValue(boundExpression, BindValueKind.RValueOrMethodGroup, diagnostics); 246boundExpression = CheckValue(boundExpression, BindValueKind.RValueOrMethodGroup, diagnostics); 761extensionMemberAccess = CheckValue(extensionMemberAccess, BindValueKind.RValue, diagnostics); 1300receiverArgument = CheckValue(receiverArgument, BindValueKind.RefOrOut, diagnostics); 1404receiver = CheckValue(receiver, BindValueKind.RefOrOut, diagnostics); 1431var valueKind = method.IsEffectivelyReadOnly 1432? BindValueKind.RefersToLocation 1433: BindValueKind.RefersToLocation | BindValueKind.Assignable; 2012return CheckValue(boundValue, BindValueKind.RValue, diagnostics); 2454boundArgument = CheckValue(boundArgument, BindValueKind.RValue, diagnostics);

35BoundExpression left = BindValue(node.Left, diagnostics, BindValueKind.CompoundAssignment); 37BoundExpression right = BindValue(node.Right, diagnostics, BindValueKind.RValue); 111if (left.Kind == BoundKind.EventAccess && !CheckEventValueKind((BoundEventAccess)left, BindValueKind.Assignable, diagnostics)) 353if (!CheckValueKind(node, left, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 926BoundExpression left = CheckValue(result, BindValueKind.RValue, diagnostics); 927BoundExpression right = BindValue(syntaxNode.Right, diagnostics, BindValueKind.RValue); 3274BoundExpression operand = BindToNaturalType(BindValue(operandSyntax, diagnostics, BindValueKind.IncrementDecrement), diagnostics); 3469!CheckValueKind(node, operand, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 4135BoundExpression operand = BindToNaturalType(BindValue(node.Operand, diagnostics, BindValueKind.AddressOf), diagnostics); 4222bool receiverIsLValue = CheckValueKind(receiver.Syntax, receiver, BindValueKind.AddressOf, checkingReceiver: false, diagnostics: BindingDiagnosticBag.Discarded); 4652private static BindValueKind GetUnaryAssignmentKind(SyntaxKind kind) 4660return BindValueKind.IncrementDecrement; 4665return BindValueKind.RValue; 5638var leftOperand = BindValue(node.Left, diagnostics, BindValueKind.RValue); 5640var rightOperand = BindValue(node.Right, diagnostics, BindValueKind.RValue); 5827BoundExpression leftOperand = BindValue(node.Left, diagnostics, BindValueKind.NullCoalescingAssignment); 5829BoundExpression rightOperand = BindValue(node.Right, diagnostics, BindValueKind.RValue); 5954BoundExpression trueExpr = BindValue(whenTrue, diagnostics, BindValueKind.RValue); 5955BoundExpression falseExpr = BindValue(whenFalse, diagnostics, BindValueKind.RValue); 5995BoundExpression trueExpr = BindValue(whenTrue, diagnostics, BindValueKind.RValue | BindValueKind.RefersToLocation); 5996BoundExpression falseExpr = BindValue(whenFalse, diagnostics, BindValueKind.RValue | BindValueKind.RefersToLocation);

775indexerAccess = CheckValue(indexerAccess, BindValueKind.RValue, diagnostics); 938indexerAccess = CheckValue(indexerAccess, BindValueKind.RValue, diagnostics); 1132originalExpression = CheckValue(originalExpression, BindValueKind.RValue, diagnostics); 2399boundMember = CheckValue(boundMember, BindValueKind.RValue, diagnostics); 2412if (!hasErrors && !CheckValueKind(node: memberName.Parent, expr: boundMember, valueKind: BindValueKind.RValue,

842BoundExpression boundExpression = lambdaBodyBinder.BindValue(expression, diagnostics, BindValueKind.RValue); 852BoundExpression boundExpression = lambdaBodyBinder.BindValue(expression, diagnostics, BindValueKind.RValue); 990var checkedUltimateReceiver = CheckValue(ultimateReceiver, BindValueKind.RValue, diagnostics);

240: BindValue(node.Expression, diagnostics, BindValueKind.RValue); 395var boundExpr = BindValue(exprSyntax, diagnostics, BindValueKind.RValue); 871BindValueKind valueKind; 878protected BoundExpression BindInferredVariableInitializer(BindingDiagnosticBag diagnostics, ExpressionSyntax initializer, BindValueKind valueKind, CSharpSyntaxNode errorSyntax) 919out BindValueKind valueKind, 926valueKind = BindValueKind.RValue; 936? BindValueKind.ReadonlyRef 937: BindValueKind.RefOrOut; 1012BindValueKind valueKind; 1423var lhsKind = isRef ? BindValueKind.RefAssignable : BindValueKind.Assignable; 1431var rhsKind = isRef ? GetRequiredRHSValueKindForRefAssignment(op1) : BindValueKind.RValue; 1444private static BindValueKind GetRequiredRHSValueKindForRefAssignment(BoundExpression boundLeft) 1446var rhsKind = BindValueKind.RefersToLocation; 1456rhsKind |= BindValueKind.Assignable; 1869BindValueKind valueKind, 2686var expr = BindValue(node, diagnostics, BindValueKind.RValue); 3068BindValueKind requiredValueKind = GetRequiredReturnValueKind(refKind); 3667BindValueKind requiredValueKind = bodyBinder.GetRequiredReturnValueKind(refKind); 3683BindValueKind requiredValueKind = GetRequiredReturnValueKind(refKind); 3697private BindValueKind GetRequiredReturnValueKind(RefKind refKind) 3699BindValueKind requiredValueKind = BindValueKind.RValue; 3704BindValueKind.RefReturn : 3705BindValueKind.ReadonlyRef;

343BindValueKind requiredCurrentKind; 347requiredCurrentKind = BindValueKind.RValue; 350requiredCurrentKind = BindValueKind.Assignable | BindValueKind.RefersToLocation; 353requiredCurrentKind = BindValueKind.RefersToLocation; 631BoundExpression collectionExpr = this.GetBinder(collectionSyntax).BindValue(collectionSyntax, diagnostics, BindValueKind.RValue); 844if (CheckValueKind(collectionExpr.Syntax, collectionExpr, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 852if (!CheckValueKind(collectionExpr.Syntax, collectionExpr, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded))

84BoundExpression boundExpression = originalBinder.BindValue(TargetExpressionSyntax, expressionDiagnostics, Binder.BindValueKind.RValueOrMethodGroup);

519gotoCaseExpressionOpt = gotoBinder.BindValue(node.Expression, diagnostics, BindValueKind.RValue);

47BoundExpression armResult = armBinder.BindValue(node.Expression, diagnostics, BindValueKind.RValue);

93binder.BindValue(sizeExpression, diagnostics, Binder.BindValueKind.RValue),