253/// 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;)"/>. 2399AssignmentKind assignmentKind = AssignmentKind.Assignment, 2427ReportDiagnostic(assignmentKind == AssignmentKind.Return ? ErrorCode.WRN_NullReferenceReturn : ErrorCode.WRN_NullAsNonNullable, location); 2429else if (assignmentKind == AssignmentKind.Argument) 2449ReportDiagnostic(assignmentKind == AssignmentKind.Return ? ErrorCode.WRN_NullReferenceReturn : ErrorCode.WRN_NullReferenceAssignment, location); 3011assignmentKind: AssignmentKind.Assignment); 3063returnState = VisitOptionalImplicitConversion(expr, returnType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return); 3659valueType = VisitOptionalImplicitConversion(initializer, targetTypeOpt: inferredType ? default : type, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 3925assignmentKind: AssignmentKind.Argument, 3964useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment, delayCompletionForTargetType: true).completion; 4481VisitOptionalImplicitConversion(node.Right, type, useLegacyWarnings: false, trackMembers: true, AssignmentKind.Assignment, delayCompletionForType); 4802_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment); 4847fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Assignment, reportRemainingWarnings: true, reportTopLevelWarnings: false); 4859checkConversion: true, fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Assignment, reportRemainingWarnings: false); 4962checkConversion: false, fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Return, 5351AssignmentKind.Argument); 5407AssignmentKind.Argument, 5783TypeWithState rightResult = VisitOptionalImplicitConversion(rightOperand, targetType, useLegacyWarnings: UseLegacyWarnings(leftOperand), trackMembers: false, AssignmentKind.Assignment); 5878AssignmentKind.Assignment, 5919assignmentKind: AssignmentKind.Assignment); 6346AssignmentKind.Assignment, 7746assignmentKind: AssignmentKind.Argument, 8693AssignmentKind.Assignment, 8707private TypeWithState VisitOptionalImplicitConversion(BoundExpression expr, TypeWithAnnotations targetTypeOpt, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind) 8724AssignmentKind assignmentKind, 8736bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, 8770Func<TypeWithAnnotations, TypeWithState> visitConversionAsContinuation(BoundExpression expr, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, BoundExpression operand, Conversion conversion, TypeWithState operandType) 8928AssignmentKind assignmentKind, 9183AssignmentKind assignmentKind, 9507if (assignmentKind == AssignmentKind.Argument) 9733AssignmentKind assignmentKind, 9801AssignmentKind.Argument, 9952AssignmentKind assignmentKind, 9964if (assignmentKind == AssignmentKind.Argument) 10385rightState = VisitOptionalImplicitConversion(right, targetTypeOpt: discarded ? default : leftLValueType, UseLegacyWarnings(left), trackMembers: true, AssignmentKind.Assignment); 10709valueType = VisitOptionalImplicitConversion(rightPart, lvalueType, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 10726AssignmentKind.Assignment, 10863AssignmentKind assignmentKind = AssignmentKind.Assignment; 10875assignmentKind = AssignmentKind.Argument; 10928AssignmentKind.Assignment); 11020assignmentKind: AssignmentKind.Assignment); 11062ReportNullableAssignmentIfNecessary(argument, paramType, argumentType, useLegacyWarnings: false, AssignmentKind.Argument, parameterOpt: parameter); 11454AssignmentKind.Assignment); 11629AssignmentKind.ForEachIterationVariable, 11765assignmentKind: AssignmentKind.Argument, 12490_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return);