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;)"/>. 2460AssignmentKind assignmentKind = AssignmentKind.Assignment, 2488ReportDiagnostic(assignmentKind == AssignmentKind.Return ? ErrorCode.WRN_NullReferenceReturn : ErrorCode.WRN_NullAsNonNullable, location); 2490else if (assignmentKind == AssignmentKind.Argument) 2510ReportDiagnostic(assignmentKind == AssignmentKind.Return ? ErrorCode.WRN_NullReferenceReturn : ErrorCode.WRN_NullReferenceAssignment, location); 3073assignmentKind: AssignmentKind.Assignment); 3125returnState = VisitOptionalImplicitConversion(expr, returnType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return); 3745valueType = VisitOptionalImplicitConversion(initializer, targetTypeOpt: inferredType ? default : type, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 4131assignmentKind: AssignmentKind.Argument, 4169useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment, delayCompletionForTargetType: true).completion; 4808VisitOptionalImplicitConversion(node.Right, type, useLegacyWarnings: false, trackMembers: true, AssignmentKind.Assignment, delayCompletionForType); 5130_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment); 5175fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Assignment, reportRemainingWarnings: true, reportTopLevelWarnings: false); 5187checkConversion: true, fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Assignment, reportRemainingWarnings: false); 5290checkConversion: false, fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Return, 5678AssignmentKind.Argument); 5791AssignmentKind.Argument, 6173TypeWithState rightResult = VisitOptionalImplicitConversion(rightOperand, targetType, useLegacyWarnings: UseLegacyWarnings(leftOperand), trackMembers: false, AssignmentKind.Assignment); 6270AssignmentKind.Assignment, 6311assignmentKind: AssignmentKind.Assignment); 6738AssignmentKind.Assignment, 8234assignmentKind: AssignmentKind.Argument, 9259AssignmentKind.Assignment, 9273private TypeWithState VisitOptionalImplicitConversion(BoundExpression expr, TypeWithAnnotations targetTypeOpt, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind) 9290AssignmentKind assignmentKind, 9302bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, 9336Func<TypeWithAnnotations, TypeWithState> visitConversionAsContinuation(BoundExpression expr, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, BoundExpression operand, Conversion conversion, TypeWithState operandType) 9495AssignmentKind assignmentKind, 9807AssignmentKind assignmentKind, 10191if (assignmentKind == AssignmentKind.Argument) 10425AssignmentKind assignmentKind, 10492AssignmentKind.Argument, 10578AssignmentKind assignmentKind, 10653AssignmentKind.Argument, 10813AssignmentKind assignmentKind, 10825if (assignmentKind == AssignmentKind.Argument) 11246rightState = VisitOptionalImplicitConversion(right, targetTypeOpt: discarded ? default : leftLValueType, UseLegacyWarnings(left), trackMembers: true, AssignmentKind.Assignment); 11569valueType = VisitOptionalImplicitConversion(rightPart, lvalueType, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 11586AssignmentKind.Assignment, 11789AssignmentKind assignmentKind = AssignmentKind.Assignment; 11819assignmentKind = AssignmentKind.Argument; 11872AssignmentKind.Assignment); 12014assignmentKind: AssignmentKind.Assignment); 12473AssignmentKind.Assignment); 12639AssignmentKind.ForEachIterationVariable, 12783assignmentKind: AssignmentKind.Argument, 13016assignmentKind: AssignmentKind.Argument, 13609_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return);