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;)"/>. 2423AssignmentKind assignmentKind = AssignmentKind.Assignment, 2451ReportDiagnostic(assignmentKind == AssignmentKind.Return ? ErrorCode.WRN_NullReferenceReturn : ErrorCode.WRN_NullAsNonNullable, location); 2453else if (assignmentKind == AssignmentKind.Argument) 2473ReportDiagnostic(assignmentKind == AssignmentKind.Return ? ErrorCode.WRN_NullReferenceReturn : ErrorCode.WRN_NullReferenceAssignment, location); 3035assignmentKind: AssignmentKind.Assignment); 3087returnState = VisitOptionalImplicitConversion(expr, returnType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return); 3680valueType = VisitOptionalImplicitConversion(initializer, targetTypeOpt: inferredType ? default : type, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 3946assignmentKind: AssignmentKind.Argument, 3985useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment, delayCompletionForTargetType: true).completion; 4539VisitOptionalImplicitConversion(node.Right, type, useLegacyWarnings: false, trackMembers: true, AssignmentKind.Assignment, delayCompletionForType); 4860_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment); 4905fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Assignment, reportRemainingWarnings: true, reportTopLevelWarnings: false); 4917checkConversion: true, fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Assignment, reportRemainingWarnings: false); 5020checkConversion: false, fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Return, 5408AssignmentKind.Argument); 5521AssignmentKind.Argument, 5903TypeWithState rightResult = VisitOptionalImplicitConversion(rightOperand, targetType, useLegacyWarnings: UseLegacyWarnings(leftOperand), trackMembers: false, AssignmentKind.Assignment); 5998AssignmentKind.Assignment, 6039assignmentKind: AssignmentKind.Assignment); 6466AssignmentKind.Assignment, 7936assignmentKind: AssignmentKind.Argument, 8930AssignmentKind.Assignment, 8944private TypeWithState VisitOptionalImplicitConversion(BoundExpression expr, TypeWithAnnotations targetTypeOpt, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind) 8961AssignmentKind assignmentKind, 8973bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, 9007Func<TypeWithAnnotations, TypeWithState> visitConversionAsContinuation(BoundExpression expr, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, BoundExpression operand, Conversion conversion, TypeWithState operandType) 9165AssignmentKind assignmentKind, 9420AssignmentKind assignmentKind, 9744if (assignmentKind == AssignmentKind.Argument) 9978AssignmentKind assignmentKind, 10046AssignmentKind.Argument, 10197AssignmentKind assignmentKind, 10209if (assignmentKind == AssignmentKind.Argument) 10630rightState = VisitOptionalImplicitConversion(right, targetTypeOpt: discarded ? default : leftLValueType, UseLegacyWarnings(left), trackMembers: true, AssignmentKind.Assignment); 10952valueType = VisitOptionalImplicitConversion(rightPart, lvalueType, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 10969AssignmentKind.Assignment, 11168AssignmentKind assignmentKind = AssignmentKind.Assignment; 11186assignmentKind = AssignmentKind.Argument; 11239AssignmentKind.Assignment); 11377assignmentKind: AssignmentKind.Assignment); 11808AssignmentKind.Assignment); 11984AssignmentKind.ForEachIterationVariable, 12128assignmentKind: AssignmentKind.Argument, 12361assignmentKind: AssignmentKind.Argument, 12956_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return);