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, 7841assignmentKind: AssignmentKind.Argument, 8788AssignmentKind.Assignment, 8802private TypeWithState VisitOptionalImplicitConversion(BoundExpression expr, TypeWithAnnotations targetTypeOpt, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind) 8819AssignmentKind assignmentKind, 8831bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, 8865Func<TypeWithAnnotations, TypeWithState> visitConversionAsContinuation(BoundExpression expr, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, BoundExpression operand, Conversion conversion, TypeWithState operandType) 9023AssignmentKind assignmentKind, 9278AssignmentKind assignmentKind, 9602if (assignmentKind == AssignmentKind.Argument) 9828AssignmentKind assignmentKind, 9896AssignmentKind.Argument, 10047AssignmentKind assignmentKind, 10059if (assignmentKind == AssignmentKind.Argument) 10480rightState = VisitOptionalImplicitConversion(right, targetTypeOpt: discarded ? default : leftLValueType, UseLegacyWarnings(left), trackMembers: true, AssignmentKind.Assignment); 10804valueType = VisitOptionalImplicitConversion(rightPart, lvalueType, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 10821AssignmentKind.Assignment, 11021AssignmentKind assignmentKind = AssignmentKind.Assignment; 11039assignmentKind = AssignmentKind.Argument; 11092AssignmentKind.Assignment); 11231assignmentKind: AssignmentKind.Assignment); 11654AssignmentKind.Assignment); 11829AssignmentKind.ForEachIterationVariable, 11966assignmentKind: AssignmentKind.Argument, 12199assignmentKind: AssignmentKind.Argument, 12794_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return);