477private const BindValueKind ValueKindSignificantBitsMask = unchecked((BindValueKind)~((1 << ValueKindInsignificantBits) - 1)); 574private static bool RequiresRValueOnly(BindValueKind kind) 576return (kind & ValueKindSignificantBitsMask) == BindValueKind.RValue; 579private static bool RequiresAssignmentOnly(BindValueKind kind) 581return (kind & ValueKindSignificantBitsMask) == BindValueKind.Assignable; 584private static bool RequiresVariable(BindValueKind kind) 589private static bool RequiresReferenceToLocation(BindValueKind kind) 591return (kind & BindValueKind.RefersToLocation) != 0; 594private static bool RequiresAssignableVariable(BindValueKind kind) 596return (kind & BindValueKind.Assignable) != 0; 599private static bool RequiresRefAssignableVariable(BindValueKind kind) 601return (kind & BindValueKind.RefAssignable) != 0; 604private static bool RequiresRefOrOut(BindValueKind kind) 606return (kind & BindValueKind.RefOrOut) == BindValueKind.RefOrOut; 611private static AccessorKind GetIndexerAccessorKind(BoundIndexerAccess indexerAccess, BindValueKind valueKind) 621private static AccessorKind GetAccessorKind(BindValueKind valueKind) 623var coreValueKind = valueKind & ValueKindSignificantBitsMask; 626BindValueKind.CompoundAssignment => AccessorKind.Both, 627BindValueKind.Assignable => AccessorKind.Set, 632private BoundIndexerAccess BindIndexerDefaultArgumentsAndParamsCollection(BoundIndexerAccess indexerAccess, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 634var coreValueKind = valueKind & ValueKindSignificantBitsMask; 636var useSetAccessor = coreValueKind == BindValueKind.Assignable && indexerAccess.Indexer.RefKind != RefKind.Ref; 733private BoundExpression CheckValue(BoundExpression expr, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 748Debug.Assert(expr.Syntax.Kind() != SyntaxKind.Argument || valueKind == BindValueKind.RefOrOut); 753Debug.Assert(valueKind == BindValueKind.RefOrOut); 757Debug.Assert(valueKind is (BindValueKind.Assignable or BindValueKind.RefOrOut or BindValueKind.RefAssignable) || diagnostics.DiagnosticBag is null || diagnostics.HasAnyResolvedErrors()); 809if (valueKind == BindValueKind.RValue) 816if ((valueKind & BindValueKind.RefersToLocation) == BindValueKind.RefersToLocation) 824if ((valueKind & BindValueKind.RefersToLocation) == BindValueKind.RefersToLocation) 838if (expr.Kind == BoundKind.MethodGroup && valueKind != BindValueKind.RValueOrMethodGroup) 887expr.HasAnyErrors && valueKind == BindValueKind.RValueOrMethodGroup) 892var resultKind = (valueKind == BindValueKind.RValue || valueKind == BindValueKind.RValueOrMethodGroup) ? 924internal bool CheckValueKind(SyntaxNode node, BoundExpression expr, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 982case BoundKind.MethodGroup when valueKind == BindValueKind.AddressOf: 1204bool checkArrayAccessValueKind(SyntaxNode node, BindValueKind valueKind, ImmutableArray<BoundExpression> indices, BindingDiagnosticBag diagnostics) 1226private static void ReportThisLvalueError(SyntaxNode node, BindValueKind valueKind, bool isValueType, bool isPrimaryConstructorParameter, BindingDiagnosticBag diagnostics) 1254private void CheckAddressOfInAsyncOrIteratorMethod(SyntaxNode node, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 1256if (valueKind == BindValueKind.AddressOf) 1269private bool CheckLocalValueKind(SyntaxNode node, BoundLocal local, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1359private bool CheckParameterValueKind(SyntaxNode node, BoundParameter parameter, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1361Debug.Assert(!RequiresAssignableVariable(BindValueKind.AddressOf)); 1422static void reportReadOnlyParameterError(ParameterSymbol parameterSymbol, SyntaxNode node, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1426Debug.Assert(valueKind != BindValueKind.AddressOf); // If this assert fails, we probably should report ErrorCode.ERR_InvalidAddrOp 1432if (valueKind == BindValueKind.RefReturn) 1451if (valueKind == BindValueKind.RefReturn) 1567private bool CheckFieldValueKind(SyntaxNode node, BoundFieldAccess fieldAccess, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1612Debug.Assert(valueKind == BindValueKind.RefAssignable); 1629return CheckIsValidReceiverForVariable(node, fieldAccess.ReceiverOpt, BindValueKind.Assignable, diagnostics); 1715private bool CheckSimpleAssignmentValueKind(SyntaxNode node, BoundAssignmentOperator assignment, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 1794private bool CheckEventValueKind(BoundEventAccess boundEvent, BindValueKind valueKind, BindingDiagnosticBag diagnostics) 1805if (valueKind == BindValueKind.CompoundAssignment) 1831if (!CheckIsValidReceiverForVariable(eventSyntax, receiver, BindValueKind.Assignable, diagnostics)) 1838if (eventSymbol.IsWindowsRuntimeEvent && valueKind != BindValueKind.Assignable) 1842if (valueKind == BindValueKind.RefOrOut) 1863private bool CheckIsValidReceiverForVariable(SyntaxNode node, BoundExpression receiver, BindValueKind kind, BindingDiagnosticBag diagnostics) 1893BindValueKind valueKind, 1934private bool CheckPropertyValueKind(SyntaxNode node, BoundExpression expr, BindValueKind valueKind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 1961else if (valueKind == BindValueKind.RefOrOut) 2032var setValueKind = setMethod.IsEffectivelyReadOnly ? BindValueKind.RValue : BindValueKind.Assignable; 3405private static void ReportReadonlyLocalError(SyntaxNode node, LocalSymbol local, BindValueKind kind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 3408Debug.Assert(kind != BindValueKind.RValue); 3443private static ErrorCode GetThisLvalueError(BindValueKind kind, bool isValueType, bool isPrimaryConstructorParameter) 3447case BindValueKind.CompoundAssignment: 3448case BindValueKind.Assignable: 3451case BindValueKind.RefOrOut: 3454case BindValueKind.AddressOf: 3457case BindValueKind.IncrementDecrement: 3460case BindValueKind.RefReturn: 3461case BindValueKind.ReadonlyRef: 3464case BindValueKind.RefAssignable: 3476private static ErrorCode GetRangeLvalueError(BindValueKind kind) 3480case BindValueKind.Assignable: 3481case BindValueKind.CompoundAssignment: 3482case BindValueKind.IncrementDecrement: 3485case BindValueKind.AddressOf: 3488case BindValueKind.RefReturn: 3489case BindValueKind.ReadonlyRef: 3492case BindValueKind.RefAssignable: 3504private static ErrorCode GetMethodGroupOrFunctionPointerLvalueError(BindValueKind valueKind) 3515private static ErrorCode GetStandardLvalueError(BindValueKind kind) 3519case BindValueKind.CompoundAssignment: 3520case BindValueKind.Assignable: 3523case BindValueKind.AddressOf: 3526case BindValueKind.IncrementDecrement: 3529case BindValueKind.FixedReceiver: 3532case BindValueKind.RefReturn: 3533case BindValueKind.ReadonlyRef: 3536case BindValueKind.RefAssignable: 3564private static void ReportReadOnlyFieldError(FieldSymbol field, SyntaxNode node, BindValueKind kind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 3572Debug.Assert(kind != BindValueKind.AddressOf); // If this assert fails, we probably should report ErrorCode.ERR_InvalidAddrOp 3589int index = (checkingReceiver ? 6 : 0) + (field.IsStatic ? 3 : 0) + (kind == BindValueKind.RefReturn ? 0 : (RequiresRefOrOut(kind) ? 1 : 2)); 3600private static void ReportReadOnlyError(Symbol symbol, SyntaxNode node, BindValueKind kind, bool checkingReceiver, BindingDiagnosticBag diagnostics) 3607if (kind == BindValueKind.AddressOf) 3625int index = (checkingReceiver ? 3 : 0) + (kind == BindValueKind.RefReturn ? 0 : (RequiresRefOrOut(kind) ? 1 : 2));

563BoundExpression namedArgumentValue = this.BindValue(namedArgument.Expression, diagnostics, BindValueKind.RValue);

455if (CheckValueKind(syntax, source, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 470if (CheckValueKind(syntax, source, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded))

99BoundExpression boundRight = rightPlaceholder ?? BindValue(right, deconstructionDiagnostics, BindValueKind.RValue); 658memberAccess = CheckValue(memberAccess, BindValueKind.RValueOrMethodGroup, diagnostics); 792var checkedVariable = CheckValue(boundVariable, BindValueKind.Assignable, diagnostics);

242internal BoundExpression BindValue(ExpressionSyntax node, BindingDiagnosticBag diagnostics, BindValueKind valueKind) 250return BindToNaturalType(BindValue(node, diagnostics, BindValueKind.RValue), diagnostics, reportNoTargetType); 267return CheckValue(valueOrType, BindValueKind.RValue, diagnostics); 449internal BoundExpression BindValueAllowArgList(ExpressionSyntax node, BindingDiagnosticBag diagnostics, BindValueKind valueKind) 494BindValueKind valueKind; 527valueBeforeConversion = defaultValueBinder.BindValue(defaultValueSyntax.Value, diagnostics, BindValueKind.RValue); 545var initializer = initializerBinder.BindValue(equalsValueSyntax.Value, diagnostics, BindValueKind.RValue); 875node, LookupResultKind.Empty, ImmutableArray<Symbol>.Empty, ImmutableArray.Create<BoundExpression>(BindToTypeForErrorRecovery(BindValue(node.Expression, BindingDiagnosticBag.Discarded, BindValueKind.RefersToLocation))), 1027ImmutableArray.Create(BindValue(arguments[0].Expression, diagnostics, BindValueKind.RValue)) : 1057BoundExpression boundArgument = BindValue(argumentSyntax.Expression, diagnostics, BindValueKind.RValue); 1238BoundExpression argument = BindValue(node.Expression, diagnostics, BindValueKind.RValue); 1261BoundExpression argument = this.BindValue(node.Expression, diagnostics, BindValueKind.RefOrOut); 1286BoundExpression argument = BindValue(node.Expression, diagnostics, BindValueKind.RValue); 2611BoundExpression operand = this.BindValue(node.Expression, diagnostics, BindValueKind.RValue); 2636BoundExpression boundOperand = BindValue(node.Operand, diagnostics, BindValueKind.RValue); 2744BoundExpression boundOperand = BindValue(operand, diagnostics, BindValueKind.RValue); 3147var requiredValueKind = origRefKind == RefKind.In ? BindValueKind.ReadonlyRef : BindValueKind.RefOrOut; 3428BindValueKind valueKind = 3430BindValueKind.RValue : 3432BindValueKind.ReadonlyRef : 3433BindValueKind.RefOrOut; 3962if (!this.CheckValueKind(argument.Syntax, argument, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 3974if (this.CheckValueKind(argument.Syntax, argument, BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 4127var size = BindValue(dimension, diagnostics, BindValueKind.RValue); 4243var boundExpression = BindValue(expression, diagnostics, BindValueKind.RValue); 4260var boundExpression = BindValue(expression, diagnostics, BindValueKind.RValue); 4589count = BindValue(countSyntax, diagnostics, BindValueKind.RValue); 5304ExpressionElementSyntax expressionElementSyntax => @this.BindValue(expressionElementSyntax.Expression, diagnostics, BindValueKind.RValue), 5684BindValueKind rhsValueKind, 5696Debug.Assert(rhsValueKind == BindValueKind.RValue); 5784var rhsKind = isRef ? GetRequiredRHSValueKindForRefAssignment(boundLeft) : BindValueKind.RValue; 5832var boundExpression = BindValue(memberInitializer, diagnostics, BindValueKind.RValue); 5847BindValueKind valueKind = isRhsNestedInitializer ? BindValueKind.RValue : (isRef ? BindValueKind.RefAssignable : BindValueKind.Assignable); 5860leftSyntax, implicitReceiver, BindValueKind.Assignable, false, diagnostics); 5867BindValueKind valueKind, 6109BindValueKind valueKind, 6143return ToBadExpression(boundMember, (valueKind == BindValueKind.RValue) ? LookupResultKind.NotAValue : LookupResultKind.NotAVariable); 6398var boundElementInitializer = BindInitializerExpressionOrValue(elementInitializer, initializerType, BindValueKind.RValue, implicitReceiver.Syntax, diagnostics); 6427exprBuilder.Add(BindValue(childElementInitializer, diagnostics, BindValueKind.RValue)); 7716boundLeft = CheckValue(boundLeft, BindValueKind.RValue, diagnostics); 7826boundLeft = CheckValue(boundLeft, BindValueKind.RValue, diagnostics); 8984hasError = !CheckValueKind(node, receiver, BindValueKind.FixedReceiver, checkingReceiver: false, diagnostics: diagnostics); 9397receiver = CheckValue(receiver, BindValueKind.RValue, diagnostics); 9527if (CheckValueKind(node, expr, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 9539if (!CheckValueKind(node, expr, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 10565lengthOrCountAccess = CheckValue(lengthOrCountAccess, BindValueKind.RValue, diagnostics); 11400var 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); 737extensionMemberAccess = CheckValue(extensionMemberAccess, BindValueKind.RValue, diagnostics); 1277receiverArgument = CheckValue(receiverArgument, BindValueKind.RefOrOut, diagnostics); 1380receiver = CheckValue(receiver, BindValueKind.RefOrOut, diagnostics); 1407var valueKind = method.IsEffectivelyReadOnly 1408? BindValueKind.RefersToLocation 1409: BindValueKind.RefersToLocation | BindValueKind.Assignable; 1979return CheckValue(typeOrValue.Data.ValueExpression, BindValueKind.RValue, diagnostics); 2409boundArgument = CheckValue(boundArgument, BindValueKind.RValue, diagnostics);

37BoundExpression right = BindValue(node.Right, diagnostics, BindValueKind.RValue); 111if (left.Kind == BoundKind.EventAccess && !CheckEventValueKind((BoundEventAccess)left, BindValueKind.Assignable, diagnostics)) 357if (!CheckValueKind(node, left, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 929BindValueKind bindValueKind = GetBinaryAssignmentKind(syntaxNode.Kind()); 931BoundExpression right = BindValue(syntaxNode.Right, diagnostics, BindValueKind.RValue); 3261BoundExpression operand = BindToNaturalType(BindValue(operandSyntax, diagnostics, BindValueKind.IncrementDecrement), diagnostics); 3456!CheckValueKind(node, operand, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 4112BoundExpression operand = BindToNaturalType(BindValue(node.Operand, diagnostics, BindValueKind.AddressOf), diagnostics); 4199bool receiverIsLValue = CheckValueKind(receiver.Syntax, receiver, BindValueKind.AddressOf, checkingReceiver: false, diagnostics: BindingDiagnosticBag.Discarded); 4629private static BindValueKind GetBinaryAssignmentKind(SyntaxKind kind) 4634return BindValueKind.Assignable; 4647return BindValueKind.CompoundAssignment; 4649return BindValueKind.RValue; 4653private static BindValueKind GetUnaryAssignmentKind(SyntaxKind kind) 4661return BindValueKind.IncrementDecrement; 4666return BindValueKind.RValue; 5587var leftOperand = BindValue(node.Left, diagnostics, BindValueKind.RValue); 5589var rightOperand = BindValue(node.Right, diagnostics, BindValueKind.RValue); 5776BoundExpression leftOperand = BindValue(node.Left, diagnostics, BindValueKind.CompoundAssignment); 5778BoundExpression rightOperand = BindValue(node.Right, diagnostics, BindValueKind.RValue); 5905BoundExpression trueExpr = BindValue(whenTrue, diagnostics, BindValueKind.RValue); 5906BoundExpression falseExpr = BindValue(whenFalse, diagnostics, BindValueKind.RValue); 5946BoundExpression trueExpr = BindValue(whenTrue, diagnostics, BindValueKind.RValue | BindValueKind.RefersToLocation); 5947BoundExpression falseExpr = BindValue(whenFalse, diagnostics, BindValueKind.RValue | BindValueKind.RefersToLocation);

251indexerAccess = CheckValue(indexerAccess, BindValueKind.RValue, diagnostics); 400indexerAccess = CheckValue(indexerAccess, BindValueKind.RValue, diagnostics); 548expression = CheckValue(expression, BindValueKind.RValue, diagnostics); 1600boundMember = CheckValue(boundMember, BindValueKind.RValue, diagnostics); 1613if (!hasErrors && !CheckValueKind(node: memberName.Parent, expr: boundMember, valueKind: BindValueKind.RValue,

848BoundExpression boundExpression = lambdaBodyBinder.BindValue(expression, diagnostics, BindValueKind.RValue); 858BoundExpression boundExpression = lambdaBodyBinder.BindValue(expression, diagnostics, BindValueKind.RValue); 998var 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; 1422var lhsKind = isRef ? BindValueKind.RefAssignable : BindValueKind.Assignable; 1430var rhsKind = isRef ? GetRequiredRHSValueKindForRefAssignment(op1) : BindValueKind.RValue; 1443private static BindValueKind GetRequiredRHSValueKindForRefAssignment(BoundExpression boundLeft) 1445var rhsKind = BindValueKind.RefersToLocation; 1455rhsKind |= BindValueKind.Assignable; 1867BindValueKind valueKind, 2684var expr = BindValue(node, diagnostics, BindValueKind.RValue); 3040BindValueKind requiredValueKind = GetRequiredReturnValueKind(refKind); 3623BindValueKind requiredValueKind = bodyBinder.GetRequiredReturnValueKind(refKind); 3639BindValueKind requiredValueKind = GetRequiredReturnValueKind(refKind); 3653private BindValueKind GetRequiredReturnValueKind(RefKind refKind) 3655BindValueKind requiredValueKind = BindValueKind.RValue; 3660BindValueKind.RefReturn : 3661BindValueKind.ReadonlyRef;

343BindValueKind requiredCurrentKind; 347requiredCurrentKind = BindValueKind.RValue; 350requiredCurrentKind = BindValueKind.Assignable | BindValueKind.RefersToLocation; 353requiredCurrentKind = BindValueKind.RefersToLocation; 629BoundExpression collectionExpr = this.GetBinder(collectionSyntax).BindValue(collectionSyntax, diagnostics, BindValueKind.RValue); 839if (CheckValueKind(collectionExpr.Syntax, collectionExpr, BindValueKind.RefersToLocation | BindValueKind.Assignable, checkingReceiver: false, BindingDiagnosticBag.Discarded)) 847if (!CheckValueKind(collectionExpr.Syntax, collectionExpr, BindValueKind.RefersToLocation, checkingReceiver: false, BindingDiagnosticBag.Discarded))

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

497gotoCaseExpressionOpt = gotoBinder.BindValue(node.Expression, diagnostics, BindValueKind.RValue);

46BoundExpression armResult = armBinder.BindValue(node.Expression, diagnostics, BindValueKind.RValue);

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