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, int, Location, ArrayBuilder&lt;VisitResult&gt;)"/>. 2462AssignmentKind assignmentKind = AssignmentKind.Assignment, 2490ReportDiagnostic(assignmentKind == AssignmentKind.Return ? ErrorCode.WRN_NullReferenceReturn : ErrorCode.WRN_NullAsNonNullable, location); 2492else if (assignmentKind == AssignmentKind.Argument) 2512ReportDiagnostic(assignmentKind == AssignmentKind.Return ? ErrorCode.WRN_NullReferenceReturn : ErrorCode.WRN_NullReferenceAssignment, location); 3082assignmentKind: AssignmentKind.Assignment); 3134returnState = VisitOptionalImplicitConversion(expr, returnType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return); 3754valueType = VisitOptionalImplicitConversion(initializer, targetTypeOpt: inferredType ? default : type, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 4140assignmentKind: AssignmentKind.Argument, 4178useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment, delayCompletionForTargetType: true).completion; 4754VisitOptionalImplicitConversion(node.Right, type, useLegacyWarnings: false, trackMembers: true, AssignmentKind.Assignment, delayCompletionForType); 5128_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment); 5173fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Assignment, reportRemainingWarnings: true, reportTopLevelWarnings: false); 5185checkConversion: true, fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Assignment, reportRemainingWarnings: false); 5288checkConversion: false, fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Return, 5676AssignmentKind.Argument); 5789AssignmentKind.Argument, 6171TypeWithState rightResult = VisitOptionalImplicitConversion(rightOperand, targetType, useLegacyWarnings: UseLegacyWarnings(leftOperand), trackMembers: false, AssignmentKind.Assignment); 6268AssignmentKind.Assignment, 6309assignmentKind: AssignmentKind.Assignment); 6736AssignmentKind.Assignment, 8261assignmentKind: AssignmentKind.Argument, 9286AssignmentKind.Assignment, 9300private TypeWithState VisitOptionalImplicitConversion(BoundExpression expr, TypeWithAnnotations targetTypeOpt, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind) 9317AssignmentKind assignmentKind, 9329bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, 9363Func<TypeWithAnnotations, TypeWithState> visitConversionAsContinuation(BoundExpression expr, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, BoundExpression operand, Conversion conversion, TypeWithState operandType) 9522AssignmentKind assignmentKind, 9834AssignmentKind assignmentKind, 10218if (assignmentKind == AssignmentKind.Argument) 10452AssignmentKind assignmentKind, 10519AssignmentKind.Argument, 10605AssignmentKind assignmentKind, 10682AssignmentKind.Argument, 10842AssignmentKind assignmentKind, 10854if (assignmentKind == AssignmentKind.Argument) 11275rightState = VisitOptionalImplicitConversion(right, targetTypeOpt: discarded ? default : leftLValueType, UseLegacyWarnings(left), trackMembers: true, AssignmentKind.Assignment); 11597valueType = VisitOptionalImplicitConversion(rightPart, lvalueType, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 11614AssignmentKind.Assignment, 11817AssignmentKind assignmentKind = AssignmentKind.Assignment; 11847assignmentKind = AssignmentKind.Argument; 11900AssignmentKind.Assignment); 12042assignmentKind: AssignmentKind.Assignment); 12541AssignmentKind.Assignment); 12707AssignmentKind.ForEachIterationVariable, 12851assignmentKind: AssignmentKind.Argument, 13084assignmentKind: AssignmentKind.Argument, 13677_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return);