253/// 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;)"/>. 2399AssignmentKind assignmentKind = AssignmentKind.Assignment, 2427ReportDiagnostic(assignmentKind == AssignmentKind.Return ? ErrorCode.WRN_NullReferenceReturn : ErrorCode.WRN_NullAsNonNullable, location); 2429else if (assignmentKind == AssignmentKind.Argument) 2449ReportDiagnostic(assignmentKind == AssignmentKind.Return ? ErrorCode.WRN_NullReferenceReturn : ErrorCode.WRN_NullReferenceAssignment, location); 3011assignmentKind: AssignmentKind.Assignment); 3063returnState = VisitOptionalImplicitConversion(expr, returnType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return); 3659valueType = VisitOptionalImplicitConversion(initializer, targetTypeOpt: inferredType ? default : type, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 3925assignmentKind: AssignmentKind.Argument, 3964useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment, delayCompletionForTargetType: true).completion; 4481VisitOptionalImplicitConversion(node.Right, type, useLegacyWarnings: false, trackMembers: true, AssignmentKind.Assignment, delayCompletionForType); 4802_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment); 4847fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Assignment, reportRemainingWarnings: true, reportTopLevelWarnings: false); 4859checkConversion: true, fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Assignment, reportRemainingWarnings: false); 4962checkConversion: false, fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Return, 5350AssignmentKind.Argument); 5463AssignmentKind.Argument, 5845TypeWithState rightResult = VisitOptionalImplicitConversion(rightOperand, targetType, useLegacyWarnings: UseLegacyWarnings(leftOperand), trackMembers: false, AssignmentKind.Assignment); 5940AssignmentKind.Assignment, 5981assignmentKind: AssignmentKind.Assignment); 6408AssignmentKind.Assignment, 7835assignmentKind: AssignmentKind.Argument, 8784AssignmentKind.Assignment, 8798private TypeWithState VisitOptionalImplicitConversion(BoundExpression expr, TypeWithAnnotations targetTypeOpt, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind) 8815AssignmentKind assignmentKind, 8827bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, 8861Func<TypeWithAnnotations, TypeWithState> visitConversionAsContinuation(BoundExpression expr, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, BoundExpression operand, Conversion conversion, TypeWithState operandType) 9019AssignmentKind assignmentKind, 9274AssignmentKind assignmentKind, 9598if (assignmentKind == AssignmentKind.Argument) 9832AssignmentKind assignmentKind, 9900AssignmentKind.Argument, 10051AssignmentKind assignmentKind, 10063if (assignmentKind == AssignmentKind.Argument) 10484rightState = VisitOptionalImplicitConversion(right, targetTypeOpt: discarded ? default : leftLValueType, UseLegacyWarnings(left), trackMembers: true, AssignmentKind.Assignment); 10808valueType = VisitOptionalImplicitConversion(rightPart, lvalueType, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 10825AssignmentKind.Assignment, 11025AssignmentKind assignmentKind = AssignmentKind.Assignment; 11043assignmentKind = AssignmentKind.Argument; 11096AssignmentKind.Assignment); 11235assignmentKind: AssignmentKind.Assignment); 11663AssignmentKind.Assignment); 11839AssignmentKind.ForEachIterationVariable, 11976assignmentKind: AssignmentKind.Argument, 12209assignmentKind: AssignmentKind.Argument, 12804_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return);