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, 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); 3036assignmentKind: AssignmentKind.Assignment); 3088returnState = VisitOptionalImplicitConversion(expr, returnType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return); 3681valueType = VisitOptionalImplicitConversion(initializer, targetTypeOpt: inferredType ? default : type, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 4065assignmentKind: AssignmentKind.Argument, 4103useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment, delayCompletionForTargetType: true).completion; 4697VisitOptionalImplicitConversion(node.Right, type, useLegacyWarnings: false, trackMembers: true, AssignmentKind.Assignment, delayCompletionForType); 5018_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment); 5063fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Assignment, reportRemainingWarnings: true, reportTopLevelWarnings: false); 5075checkConversion: true, fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Assignment, reportRemainingWarnings: false); 5178checkConversion: false, fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Return, 5566AssignmentKind.Argument); 5679AssignmentKind.Argument, 6061TypeWithState rightResult = VisitOptionalImplicitConversion(rightOperand, targetType, useLegacyWarnings: UseLegacyWarnings(leftOperand), trackMembers: false, AssignmentKind.Assignment); 6156AssignmentKind.Assignment, 6197assignmentKind: AssignmentKind.Assignment); 6624AssignmentKind.Assignment, 8093assignmentKind: AssignmentKind.Argument, 9098AssignmentKind.Assignment, 9112private TypeWithState VisitOptionalImplicitConversion(BoundExpression expr, TypeWithAnnotations targetTypeOpt, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind) 9129AssignmentKind assignmentKind, 9141bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, 9175Func<TypeWithAnnotations, TypeWithState> visitConversionAsContinuation(BoundExpression expr, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, BoundExpression operand, Conversion conversion, TypeWithState operandType) 9333AssignmentKind assignmentKind, 9588AssignmentKind assignmentKind, 9912if (assignmentKind == AssignmentKind.Argument) 10146AssignmentKind assignmentKind, 10213AssignmentKind.Argument, 10364AssignmentKind assignmentKind, 10376if (assignmentKind == AssignmentKind.Argument) 10797rightState = VisitOptionalImplicitConversion(right, targetTypeOpt: discarded ? default : leftLValueType, UseLegacyWarnings(left), trackMembers: true, AssignmentKind.Assignment); 11119valueType = VisitOptionalImplicitConversion(rightPart, lvalueType, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 11136AssignmentKind.Assignment, 11339AssignmentKind assignmentKind = AssignmentKind.Assignment; 11357assignmentKind = AssignmentKind.Argument; 11410AssignmentKind.Assignment); 11552assignmentKind: AssignmentKind.Assignment); 11992AssignmentKind.Assignment); 12168AssignmentKind.ForEachIterationVariable, 12312assignmentKind: AssignmentKind.Argument, 12545assignmentKind: AssignmentKind.Argument, 13140_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return);