272/// The delegate is invoked by <see cref="VisitConversion(BoundConversion, BoundExpression, Conversion, TypeWithAnnotations, TypeWithState, bool, bool, bool, AssignmentKind, ParameterSymbol, bool, bool, bool, bool, Optional&lt;LocalState&gt;,bool, Location, ArrayBuilder&lt;VisitResult&gt;)"/>. 2425AssignmentKind assignmentKind = AssignmentKind.Assignment, 2453ReportDiagnostic(assignmentKind == AssignmentKind.Return ? ErrorCode.WRN_NullReferenceReturn : ErrorCode.WRN_NullAsNonNullable, location); 2455else if (assignmentKind == AssignmentKind.Argument) 2475ReportDiagnostic(assignmentKind == AssignmentKind.Return ? ErrorCode.WRN_NullReferenceReturn : ErrorCode.WRN_NullReferenceAssignment, location); 3037assignmentKind: AssignmentKind.Assignment); 3089returnState = VisitOptionalImplicitConversion(expr, returnType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return); 3683valueType = VisitOptionalImplicitConversion(initializer, targetTypeOpt: inferredType ? default : type, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 3949assignmentKind: AssignmentKind.Argument, 3988useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment, delayCompletionForTargetType: true).completion; 4543VisitOptionalImplicitConversion(node.Right, type, useLegacyWarnings: false, trackMembers: true, AssignmentKind.Assignment, delayCompletionForType); 4864_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment); 4909fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Assignment, reportRemainingWarnings: true, reportTopLevelWarnings: false); 4921checkConversion: true, fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Assignment, reportRemainingWarnings: false); 5024checkConversion: false, fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Return, 5412AssignmentKind.Argument); 5525AssignmentKind.Argument, 5907TypeWithState rightResult = VisitOptionalImplicitConversion(rightOperand, targetType, useLegacyWarnings: UseLegacyWarnings(leftOperand), trackMembers: false, AssignmentKind.Assignment); 6002AssignmentKind.Assignment, 6043assignmentKind: AssignmentKind.Assignment); 6470AssignmentKind.Assignment, 7940assignmentKind: AssignmentKind.Argument, 8934AssignmentKind.Assignment, 8948private TypeWithState VisitOptionalImplicitConversion(BoundExpression expr, TypeWithAnnotations targetTypeOpt, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind) 8965AssignmentKind assignmentKind, 8977bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, 9011Func<TypeWithAnnotations, TypeWithState> visitConversionAsContinuation(BoundExpression expr, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, BoundExpression operand, Conversion conversion, TypeWithState operandType) 9169AssignmentKind assignmentKind, 9424AssignmentKind assignmentKind, 9748if (assignmentKind == AssignmentKind.Argument) 9982AssignmentKind assignmentKind, 10050AssignmentKind.Argument, 10201AssignmentKind assignmentKind, 10213if (assignmentKind == AssignmentKind.Argument) 10634rightState = VisitOptionalImplicitConversion(right, targetTypeOpt: discarded ? default : leftLValueType, UseLegacyWarnings(left), trackMembers: true, AssignmentKind.Assignment); 10956valueType = VisitOptionalImplicitConversion(rightPart, lvalueType, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 10973AssignmentKind.Assignment, 11172AssignmentKind assignmentKind = AssignmentKind.Assignment; 11190assignmentKind = AssignmentKind.Argument; 11243AssignmentKind.Assignment); 11381assignmentKind: AssignmentKind.Assignment); 11814AssignmentKind.Assignment); 11990AssignmentKind.ForEachIterationVariable, 12134assignmentKind: AssignmentKind.Argument, 12367assignmentKind: AssignmentKind.Argument, 12962_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return);