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;)"/>. 2424AssignmentKind assignmentKind = AssignmentKind.Assignment, 2452ReportDiagnostic(assignmentKind == AssignmentKind.Return ? ErrorCode.WRN_NullReferenceReturn : ErrorCode.WRN_NullAsNonNullable, location); 2454else if (assignmentKind == AssignmentKind.Argument) 2474ReportDiagnostic(assignmentKind == AssignmentKind.Return ? ErrorCode.WRN_NullReferenceReturn : ErrorCode.WRN_NullReferenceAssignment, location); 3037assignmentKind: AssignmentKind.Assignment); 3089returnState = VisitOptionalImplicitConversion(expr, returnType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return); 3709valueType = VisitOptionalImplicitConversion(initializer, targetTypeOpt: inferredType ? default : type, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 4093assignmentKind: AssignmentKind.Argument, 4131useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment, delayCompletionForTargetType: true).completion; 4769VisitOptionalImplicitConversion(node.Right, type, useLegacyWarnings: false, trackMembers: true, AssignmentKind.Assignment, delayCompletionForType); 5090_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment); 5135fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Assignment, reportRemainingWarnings: true, reportTopLevelWarnings: false); 5147checkConversion: true, fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Assignment, reportRemainingWarnings: false); 5250checkConversion: false, fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Return, 5638AssignmentKind.Argument); 5751AssignmentKind.Argument, 6133TypeWithState rightResult = VisitOptionalImplicitConversion(rightOperand, targetType, useLegacyWarnings: UseLegacyWarnings(leftOperand), trackMembers: false, AssignmentKind.Assignment); 6230AssignmentKind.Assignment, 6271assignmentKind: AssignmentKind.Assignment); 6698AssignmentKind.Assignment, 8192assignmentKind: AssignmentKind.Argument, 9222AssignmentKind.Assignment, 9236private TypeWithState VisitOptionalImplicitConversion(BoundExpression expr, TypeWithAnnotations targetTypeOpt, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind) 9253AssignmentKind assignmentKind, 9265bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, 9299Func<TypeWithAnnotations, TypeWithState> visitConversionAsContinuation(BoundExpression expr, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, BoundExpression operand, Conversion conversion, TypeWithState operandType) 9458AssignmentKind assignmentKind, 9771AssignmentKind assignmentKind, 10156if (assignmentKind == AssignmentKind.Argument) 10390AssignmentKind assignmentKind, 10457AssignmentKind.Argument, 10536AssignmentKind assignmentKind, 10614AssignmentKind.Argument, 10763AssignmentKind assignmentKind, 10775if (assignmentKind == AssignmentKind.Argument) 11196rightState = VisitOptionalImplicitConversion(right, targetTypeOpt: discarded ? default : leftLValueType, UseLegacyWarnings(left), trackMembers: true, AssignmentKind.Assignment); 11518valueType = VisitOptionalImplicitConversion(rightPart, lvalueType, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 11535AssignmentKind.Assignment, 11738AssignmentKind assignmentKind = AssignmentKind.Assignment; 11764assignmentKind = AssignmentKind.Argument; 11817AssignmentKind.Assignment); 11959assignmentKind: AssignmentKind.Assignment); 12418AssignmentKind.Assignment); 12584AssignmentKind.ForEachIterationVariable, 12728assignmentKind: AssignmentKind.Argument, 12961assignmentKind: AssignmentKind.Argument, 13554_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return);