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;)"/>. 2497AssignmentKind assignmentKind = AssignmentKind.Assignment, 2525ReportDiagnostic(assignmentKind == AssignmentKind.Return ? ErrorCode.WRN_NullReferenceReturn : ErrorCode.WRN_NullAsNonNullable, location); 2527else if (assignmentKind == AssignmentKind.Argument) 2547ReportDiagnostic(assignmentKind == AssignmentKind.Return ? ErrorCode.WRN_NullReferenceReturn : ErrorCode.WRN_NullReferenceAssignment, location); 3117assignmentKind: AssignmentKind.Assignment); 3169returnState = VisitOptionalImplicitConversion(expr, returnType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return); 3789valueType = VisitOptionalImplicitConversion(initializer, targetTypeOpt: inferredType ? default : type, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 4175assignmentKind: AssignmentKind.Argument, 4213useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment, delayCompletionForTargetType: true).completion; 4806VisitOptionalImplicitConversion(node.Right, type, useLegacyWarnings: false, trackMembers: true, AssignmentKind.Assignment, delayCompletionForType); 5180_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment); 5225fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Assignment, reportRemainingWarnings: true, reportTopLevelWarnings: false); 5237checkConversion: true, fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Assignment, reportRemainingWarnings: false); 5340checkConversion: false, fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Return, 5647AssignmentKind.Argument); 5744AssignmentKind.Argument); 5857AssignmentKind.Argument, 6239TypeWithState rightResult = VisitOptionalImplicitConversion(rightOperand, targetType, useLegacyWarnings: UseLegacyWarnings(leftOperand), trackMembers: false, AssignmentKind.Assignment); 6336AssignmentKind.Assignment, 6377assignmentKind: AssignmentKind.Assignment); 6804AssignmentKind.Assignment, 8336assignmentKind: AssignmentKind.Argument, 9361AssignmentKind.Assignment, 9375private TypeWithState VisitOptionalImplicitConversion(BoundExpression expr, TypeWithAnnotations targetTypeOpt, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind) 9392AssignmentKind assignmentKind, 9404bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, 9438Func<TypeWithAnnotations, TypeWithState> visitConversionAsContinuation(BoundExpression expr, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, BoundExpression operand, Conversion conversion, TypeWithState operandType) 9597AssignmentKind assignmentKind, 9909AssignmentKind assignmentKind, 10293if (assignmentKind == AssignmentKind.Argument) 10527AssignmentKind assignmentKind, 10594AssignmentKind.Argument, 10680AssignmentKind assignmentKind, 10761AssignmentKind.Argument, 10921AssignmentKind assignmentKind, 10933if (assignmentKind == AssignmentKind.Argument) 11354rightState = VisitOptionalImplicitConversion(right, targetTypeOpt: discarded ? default : leftLValueType, UseLegacyWarnings(left), trackMembers: true, AssignmentKind.Assignment); 11683valueType = VisitOptionalImplicitConversion(rightPart, lvalueType, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 11700AssignmentKind.Assignment, 11903AssignmentKind assignmentKind = AssignmentKind.Assignment; 11933assignmentKind = AssignmentKind.Argument; 11986AssignmentKind.Assignment); 12128assignmentKind: AssignmentKind.Assignment); 12636AssignmentKind.Assignment); 12802AssignmentKind.ForEachIterationVariable, 12946assignmentKind: AssignmentKind.Argument, 13179assignmentKind: AssignmentKind.Argument, 13772_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return);