Automated Migration of Legacy Code from the C++14 to C++23

Standard

Aleksander Świniarski

and Anna Derezińska

Warsaw University of Technology, Institute of Computer Science, Nowowiejska 15/19, Warsaw, Poland

Keywords: Transpiler, Source-to-Source Compiler, C++, Legacy Code, C++14, C++23.

Abstract: The continuous development of the C++ programming language results in changes in many programming

features from one version to another. Therefore, we face a growing increase in maintenance and evolution

costs. To address this problem, a set of removed and deprecated programming features was examined, and

automating of the feature migration was proposed. A transpiler has been developed that transforms a C++

code from a legacy form to its latest standard. The CppUp tool translates a C++14 program into its equivalent

C++23. The current version of the tool supports 17 removed and 3 deprecated features. The restrictions of the

tool limit its practical application, but the experiments conducted on seven real-world programs confirmed

the reliability and usability of the transpiler.

1 INTRODUCTION

Legacy software systems could be very important in

the operational strategy of business processes and

industrial practice. Maintenance of such systems and

manual migration between different dialects of a

programming language are a time-consuming and

costly activity (Sneed and Verhoef, 2020).

The C++ programming language, originated in the

late 1970s, is still widely used for software

development (ISOCPP, 2024). It is especially

beneficial when we challenge requirements of high

performance and low energy consumption. Since the

revolutionary change in 2011, every several years

new versions of the language with a set of feature

improvements have been announced (Bancila, 2024).

In this paper, we address the problem of a C++

program that migrates from a legacy form to the latest

one. C++14 was chosen as the starting point for

migration due to its widespread use in real-world

projects, as highlighted in the 2024 C++ Developer

Survey (ISOCPP, 2024), which shows a significant

number of developers still rely on this version. All

modifications between consecutive variants from

C++14 (ISO/IEC, 2014) to C++23 (ISO/IEC, 2024)

have been revised. Current research has focused on

https://orcid.org/0009-0008-4564-9061

https://orcid.org/0000-0001-8792-203X

those that hinder program development the most and

fall into the removed and deprecated categories. For

the selected features, source-to-source transformation

guidelines have been developed.

To support automated code migration, a CppUp

transpiler has been designed and implemented

(Cooper, 2011). The tool transforms a program from

one dialect to another while maintaining its

functionality. Its application reduces the migration

effort and minimizes the number of errors that could

be introduced during this process.

CppUp has been evaluated on a set of programs.

Unit tests and tests using real-world programs dealt

with various coding practices corresponding to the

migrated features. The evaluation of the transpiler

confirmed the reliability of the transformation within

the limitations of the current solution.

The CppUp code, together with its unit tests and

the applications used in the tool evaluation, is

available at (Świniarski, 2024).

The main contributions of the paper are:

 Examining examples of legacy programming

features and a way of their migration;

 Development of the CppUp tool that supports 17

removed and 3 deprecated features in the

transformation from C++14 to C++23;

 Experimental evaluation of the transpiler.

Swiniarski, A. and Derezi

nska, A.

Automated Migration of Legacy Code from the C++14 to C++23 Standard.

DOI: 10.5220/0013298000003928

Paper published under CC license (CC BY-NC-ND 4.0)

In Proceedings of the 20th International Conference on Evaluation of Novel Approaches to Software Engineering (ENASE 2025), pages 549-556

ISBN: 978-989-758-742-9; ISSN: 2184-4895

549

The paper is organized as follows. In the next section,

we briefly describe basic problems of code transpilers

and review related work. Section 3 contains an

explanation of the selected programming features

transformed between different versions of the C++

standards. The CppUp tool is presented in Section 4.

In Section 5, we discuss the evaluation of the tool.

Finally, Section 6 concludes the paper.

2 BACKGROUND AND RELATED

WORK

Transpilers, or source-to-source compilers, automate

code migration by translating code between dialects

or languages while preserving functionality. They

ensure that the input and output code remain at the

same abstraction level.

2.1 Transpilers in Research and

Industry

Many transpilers have been developed for different

purposes. A systematic review of transpilers and their

application can be found in (Bastidas Fuertes, Pérez,

and Meza Hormaza, 2023). It has been reported that

in the industry, transpilers are primarily used for (i)

code reusing and migration strategy for legacy

platforms, (ii) achieving compatibility with end-user

and mobile platforms, and (iii) generating language

extensions, mainly as a superset of Javascript.

Problems of legacy code translation were faced in

(Schnappinger and Streit, 2021). A system written in

Natural, Cobol, and Assembler was migrated to its

corresponding system in Cobol on Linux and Java.

The legacy code was parsed using a grammar defined

with ANTLR (ANTLR, 2024). A custom

transpilation was promoted, that is, only basic simple

transformation rules were implemented, while the

legacy code could have been inspected in

transpilation time, and complicated cases resolved by

a user. Consequently, new rules were added to the

grammar and translation.

Transpilers can operate within the same language

family. For example, a program in the strongly typed

TypeScript language needs to be compiled with the

tsc transpiler in JavaScript form, which can be

executed (TypeScript, 2024).

Others deal with languages with similar

functionality running in different environments, such

as Kotlin (Android) and Swift (iOS) supported by

unidirectional and bidirectional transpilers

(Schneider and Schultes, 2022).

An example of a multi-platform approach is Haxe,

an object-oriented and strongly typed programming

language, which framework is associated with

transpilation facilities to C#, Java, C++, Python, and

PHP (Haxe, 2024).

While general functionality should be preserved,

source-to-source transformation could be associated

with enhancement of different non-functional

requirements, namely: supporting parallel execution,

reducing power consumption, avoiding selected

programming concepts, etc.

The transformation of C programs into Rust is

supported by different tools, including the C2Rust

transpiler. However, these tools preserve the unsafe

semantics of C. The authors of CRustS, described in

(Ling, et al., 2022), focus on the safety issues

available in Rust. The approach is based on a set of

source-to-source transformation rules, both

preserving strict semantics (198 rules) and

approximating semantics with a more safe code of

Rust (22 rules).

2.2 Migration of C++ Programs

Several tools have been developed to facilitate code

migration of C++ programs.

Originally, C++ programs were translated into C

using the Cfront cross-translator. Hence, existing C

compilers could be utilized to develop the final code.

Code migration could be performed in different

directions, that is, ‘from’ or ‘to’ legacy versions. The

latter case is described in (Antal, et al., 2016), where

developers wanted to use new features of C++11, at

that time, while the code was supposed to be

compatible with C++03 used by an industrial partner.

Using (LLVM Clang, 2024), a tool was developed

that backported a large subset of C++11 features to its

older legacy version.

Parallel processing was also supported by C++

transpilers. A Togpu tool was developed to transform

C++11 into parallel CUDA to lower the entrance

barrier to GPU (Marangoni and Wischgoll, 2016).

The OP2 framework enables translation of

C/C++/Fortran programs into different parallel

models, e.g. CUDA, MPI (Chen, et al., 2024).

In high-level synthesis, C/C++ programs are

converted into appropriate domain languages, such as

Verilog (Xu et al., 2024). These kinds of program do

not cope with new programming features, as the

number of allowed programming structures is usually

strongly restricted.

To the best of our knowledge, none of the

transpilers supports a C++ program migration in the

scope addressed in this paper.

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3 MIGRATION FROM C++14 TO

C++23

The C++ language has evolved significantly beyond

C++14, with C++17 (ISO/IEC, 2017), C++20

(ISO/IEC, 2020), and C++23 offering improved

efficiency, readability, safety, and performance. Yet,

many codebases still rely on older standards,

hindering maintainability and compatibility.

Upgrading these legacy projects is essential to

optimize applications and ensure sustainability.

3.1 Taxonomy of Migration Features

When migrating a C++ codebase to a newer standard,

it is crucial to understand the added, modified,

deprecated, and removed features. These can be

grouped into the following feature categories:

 Removed - Elements that have been entirely

removed from the language. Code utilizing these

features will result in compilation errors;

 Deprecated - Features that are marked for

potential removal in future standards. While still

supported, their use generates warnings during

compilation;

 New - Additions to the language that introduce

new capabilities, improve performance, or

enhance code expressiveness;

 Modified - Existing features that have undergone

changes in syntax or behavior. Code using these

features may require adjustments to align with the

updated definitions to maintain compatibility;

 Miscellaneous - Category that encompasses

various minor additions, enhancements, or

changes that do not fit into the major categories,

such as core language features, standard library

updates, or syntax changes.

While migrating from C++14 to C++23, removed and

deprecated features pose the most immediate

concerns: removed features cause compilation errors,

while deprecated ones generate warnings that, if

ignored, can accumulate technical debt.

Table 1 summarizes the C++ features deprecated

or removed between C++17 and C++23, showing the

standard version for each change. It is based on

Annex C of the C++ standards (C++14–C++23) and

additional documents from the ISO C++ committee,

including (Köppe, 2018) and (Köppe, 2020).

Some features underwent a two-step process: first

deprecated (D) in one standard version, and then

removed in a later one. As a result, they appear twice

in the table, reflecting each stage in their timeline.

Counting each row separately yields 42 changes, but

consolidating duplicates reduces it to 35 unique

changes.

In the current prototype, only a selected subset of

these features is implemented, with the rest deferred

due to complexity. Table 1 labels implemented

features as “Yes” and unimplemented ones as “No”.

3.2 Overview of Transformations

As an example, the following sections present

features 5. and 9. for migrating the C++14 code to the

C++23 standard. For each feature, the rationale

behind its removal or deprecation and the method to

replace it with a C++23-compatible equivalent are

discussed. The approach is supported by insights

from documentation and related discussions.

3.2.1 Smart Pointer std::auto_ptr (Id. 5.)

The std::auto_ptr is a smart pointer that manages

dynamically allocated objects, automatically deleting

them when destroyed. It grants unique ownership of

the object it points to. However,

std::auto_ptr

has problematic copying semantics: when copied,

ownership transfers to the destination pointer, leaving

the source as

nullptr. This violates conventional

copy semantics, where copies are expected to be

equal and independent, leading to potential

unexpected behavior (Lavavej, 2014).

Due to these issues,

std::auto_ptr was

deprecated in C++11 and removed in C++17,

replaced by

std::unique_ptr, which uses move

semantics to ensure a consistent and safe ownership

transfer. Migrating involves replacing

std::auto_ptr declarations with

std::unique_ptr and updating any copy

operations to use

std::move.

For example:

// Original code

std::auto_ptr<int> ptr1(new int{1});

std::auto_ptr<int> ptr2(ptr1);

// Updated code

std::unique_ptr<int> ptr1(new

int{1});

std::unique_ptr<int>

ptr2(std::move(ptr1));

3.2.2 Binary Function Binders (Id. 9.)

In earlier versions of C++, std::bind1st and

std::bind2nd (from <functional>) created

unary function objects by binding one argument of a

binary function.

Automated Migration of Legacy Code from the C++14 to C++23 Standard

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However, these binders had limitations and were

deprecated in C++11, then removed in C++17. They

have been replaced by the more flexible

std::bind

and lambda expressions, which offer a clearer syntax

(Lavavej, 2014).

Migrating from

std::bind1st or

std::bind2nd to std::bind involves updating the

argument list to specify which argument is bound and

which remains dynamic using

std::placeholders::_1.

 For

std::bind1st, bind the first argument by

placing the constant value as the second argument

and

std::placeholders::_1 as the third

argument;

 For

std::bind2nd, bind the second argument by

placing

std::placeholders::_1 as the

second argument, and the constant value as the

Table 1: List of features that were removed or deprecated throughout C++14 to C++23.

Id Feature name C++ standard Feature category

Handled in

1. Tri

hs C++17 Remove

Yes

2. Re

ister ke

wor

C++17 Remove

Yes

3. ++ for Booleans C++17 Remove

Yes

4. throw(A,B,C) C++17 Remove

Yes

5. auto_pt

C++17 Remove

Yes

6. random

shuffle C++17 Remove

Yes

7. Function ob

ects C++17 Remove

Yes

8. Function ob

ects Wra

ers C++17 Remove

Yes

9. Binary Function Binders C++17 Remove

Yes

10. Iostream Aliases C++17 Remove

Yes

11. Allocator Su

ort From Function C++17 Remove

Not

12. Redeclaration of static constex

r Class Members C++17 De

recate

Not

13. C Librar

Headers C++17 De

recate

Yes

13. Ineffective “C++ versions” of compatibility headers C++17, C++20 D, Remove

Yes

14. Allocator<void>, Redundant Members of std::allocato

C++17 Deprecate

Not

15. raw_storage_iterato

C++17 Deprecate

Not

15. raw

stora

iterato

C++17, C++20 D, Remove

Not

16.

tem

orar

buffe

C++17 De

recate

Not

16. Tem

orar

buffer API C++17, C++20 D, Remove

Not

17. is_literal_type C++17 Deprecate

Yes

17. is_literal_type C++17, C++20 D, Remove

Yes

18. std::iterato

C++17 De

recate

Not

19. <codecvt> C++17 De

recate

Not

20. memor

order

consume C++17 De

recate

Not

21. shared_ptr::unique C++17 Deprecate

Yes

21. shared_ptr::unique C++17, C++20 D, Remove

Yes

22. result_of C++17 Deprecate

Yes

22. result

of C++17, C++20 D, Remove

Yes

23. uncua

exce

tion C++17 De

recate

Yes

23. uncau

exce

tion C++17, C++20 D, Remove

Yes

24. noexcept-specifier throw() C++20 Remove

Yes

25. Functional adaptors and argument type class members C++20 Remove

Yes

26. Redundant members of allocato

C++20 Remove

Not

27. Onl

's two com

lement re

resentation for si

ned inte

ers C++20 De

recate

Not

28. Notion of POD t

e C++20 De

recate

Not

29. Implicit lambda capture of this via [=] C++20 Deprecate

Yes

30. Comma operator in subscripting expressions C++20 Deprecate

Yes

31. Deprecate certain volatile qualifications C++20 Deprecate

Not

32. Shrinkin

basic

strin

::reserve C++20 De

recate

Yes

33. Garba

e collection su

ort C++23 Remove

Not

34. ali

ned

union and ali

ned

stora

e C++23 De

recate

Not

35. float_denorm_style, has_denorm_loss and has_denorm C++23 Deprecate

Not

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third.

An exemplary migration looks as follows:

//Original code

auto funFirst =

std::bind1st(std::multiplies<double>(),

pi/180.0);

auto funSecond =

std::bind2nd(std::multiplies<double>(),

pi/180.0);

//Updated code

auto funFirst =

std::bind(std::multiplies<double>(),

pi/180.0, std::placeholders::_1);

auto funSecond =

std::bind(std::multiplies<double>(),

std::placeholders::_1, pi/180.0);

4 CPPUP TRANSPILER

The CppUp transpiler is a tool designed to transform

the code compatible with the C++14 standard into one

that is compatible with the C++23 standard. The core

aim of CppUp is to simplify code migration for

developers who want to use the features provided in

the newer standard without the need for manual code

refactoring.

4.1 Requirements

The following section details the functional

requirements (A–G) and non-functional requirements

(H–M) for the CppUp transpiler.

A. Parsing and Syntax Analysis – Accurately parse

valid C++14 syntax and provide clear error

messages for syntax issues;

B. Transformation Guidelines – Implement robust

methods to convert C++14 to C++23, focusing on

20 key features listed in Table 1, replacing

deprecated elements with suitable alternatives;

C. Preservation of Functionality – Ensure that

transformed code retains original functionality,

readability, and maintainability;

D. Standards Compatibility and Compliance –

Guarantee that the generated code adheres fully to

the C++23 standard while maintaining backward

compatibility with the g++14 compiler from GCC

(GCC, 2024);

E. Extensibility and Configurability – Design a

project so that the code transformations are easy

to customize and add;

F. Testing – Include comprehensive testing to

validate functionality and prevent regressions;

G. User Interface and Experience – Provide a user-

friendly CLI with clear options, including verbose

mode for detailed logs;

H. Performance – Ensure efficient transformation,

handling large codebases quickly;

I. Usability – Offer an intuitive CLI and a detailed

user manual;

J. Reliability – Deliver robust and accurate

transformations that maintain code behavior,

handle edge cases, and provide stability on UNIX

systems;

K. Maintainability – Ensure modular, well-

structured implementation for easy updates and

debugging;

L. Scalability – Efficiently handle large projects with

many files and complex structures;

M. Interoperability – Integrate seamlessly with build

systems and development environments.

4.2 Design Overview

This section outlines the overall design of the CppUp

transpiler, highlighting the key components and

methodologies that enable its functionality.

4.2.1 Tools Used in Implementation

The CppUp transpiler was developed in C++23,

leveraging modern language features for efficiency

and maintainability. It uses the g++ compiler version

14 from the GNU Compiler Collection, which

provides near-complete support for C++23.

ANTLR 4.13.1 was chosen for parsing and syntax

analysis due to its flexibility, ease of use, and prior

familiarity, which allows rapid prototyping. The build

process is managed with CMake, simplifying

configuration and cross-platform compilation.

ClangFormat from LLVM (LLVM Clang, 2024).

Ensures that the generated code adheres to industry-

standard styles, enhancing readability and

consistency. Unit testing is performed with

GoogleTest, providing a robust framework to

maintain functionality as the project evolves.

4.2.2 Workflow of the Program

The operation of CppUp is divided into three main

steps.

At first, the program reads command-line

arguments to configure its behavior, such as

specifying input and output paths or enabling optional

features.

The second step of CppUp is to translate a C++14

code into its C++23 equivalent. It first creates an

output directory for the resulting files and directories,

Automated Migration of Legacy Code from the C++14 to C++23 Standard

553

then iterates through entities in the input path,

performing operations based on each entity type:

 Directory – The program creates a corresponding

directory with the same name in the output

directory;

 C++ File – CppUp creates a file with the same

name in the output directory, analyzes it to extract

preprocessing directives and translation units,

applies all implemented transformations, writes

the updated code, and formats it using clang-

format;

 Non C++ File – The transpiler by default copies

the file with its name and contents to the directory

for the resulting files.

In the last step, if specified, CppUp compiles all

transpiled C++ files using g++14. Users can also

request a complete build if the output forms a valid

C++ program.

4.2.3 General Architecture of CppUp

The architecture of CppUp is built for modularity and

extensibility, with each component serving a distinct

purpose. The core class, CppUp, orchestrates the

transformation process, manages file operations,

generates transpiled code, and optionally compiles or

builds the resulting project.

Parsing and syntax analysis are handled by

CPP14Lexer and CPP14Parser, constructed from the

C++14 grammar in ANTLR's grammar-v4. The lexer

tokenizes the source code into elements like

keywords, literals, and operators, while the parser

generates a parse tree representing the code's

syntactic structure.

The CppUpVisitor module handles code

transformation, traversing the parse tree to identify

and modernize constructs incompatible with C++23.

It ensures that the transformed code is functionally

equivalent while adhering to modern standards.

5 CPPUP EVALUATION

This section presents an evaluation of the CppUp

transpiler. The evaluation encompasses both the

controlled testing of individual modules and practical

experiments conducted on real-world applications.

5.1 Testing of the Approach

To ensure CppUp's reliability, a testing strategy

combined unit tests and real-world assessments. Unit

tests validated individual modules, including file

handling, code generation, syntax error management,

and transformations for all 20 implemented features

marked as “Yes” in the “Handled” column (Table 1).

5.2 Experiments on Real-World

Applications

To assess the effectiveness of CppUp in practical

scenarios, a diverse set of open-source C++14

projects was selected based on criteria such as

language compliance, feature usage, codebase size,

and available functionality verification methods. The

projects ranged from small applications to large

systems, thoroughly evaluating the tool's capabilities.

The testing methodology included the following:

1. Baseline Compilation and Execution – The

projects were compiled and executed using their

existing build systems to establish a functional

baseline;

2. Selective Transpilation – Only files using the

supported C++14 features were transpiled and

reintegrated due to current limitations;

3. Compilation with the C++23 Standard –

Modified projects were recompiled with GCC14

using the C++23 standard;

4. Comparison of Results – The outputs from the unit

tests and the example applications were compared

against the baseline to ensure functional

consistency.

Table 2 summarizes the selected projects, while Table

3 details the experimental results, including metrics

like total LOC, transpiled LOC, and the tested

features. In particular, some features handled by

CppUp were not tested, as no real-world projects that

used all features were identified during the study. The

projects in Table 3 are identified by their identifiers

from Table 2.

5.3 Discussion of Results

The evaluation confirmed that CppUp effectively

transpiles key C++14 features to C++23, maintaining

functionality across diverse projects. Unit tests

validated individual modules, while real-world tests

demonstrated seamless integration and consistent

results. However, challenges were noted. Selective

transpilation was necessary due to the separate

handling of preprocessing directives and translation

units, limiting the number of files processed (Table

3). Additionally, the reduction in output lines of code

(LOC) was due to clang-format enforcing consistent

formatting rather than simplification of constructs.

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Table 2: Real-World Projects Used in Experiments.

Pro

ect name and ori

in Descri

tion

CellularForms. Fogelman, M.,

https://github.com/fogleman/CellularForms

Implementation of Andy Lormans' conference paper on

cellula

growth (Lomas, 2014)

Flowcpp. Vanatasin, K.,

htt

s://

ithub.com/kittinunf/flowc

A header only implementation of the JavaScript Redux

(

Abramov, 2024

)

III

Butterworth Filter Design. Ruotsi, R.,

https://github.com/ruohoruotsi/Butterworth-

Filte

-Design

Project that provides a collection of classes for designing

high-order Butterworth filters

Curvature filter. Gong, Y.,

htt

s://

ithub.com/YuanhaoGon

/CurvatureFilte

Collection of algorithms developed by Yuanhao Gong

durin

his PhD work

(

Gon

, 2017

)

CoRM. Taranov, K.,

https://github.com/spcl/CoRM.

Remote memory system designed to support data

compaction over RDMA, developed as a part of research

roject presented at SIGMOD 2021 (Taranov, 2021)

Microvolt. Deynega, A.,

htt

s://

ithub.com/deine

a/microvolt

Program for modelling semiconductor devices

VII

Evhttpclient. Potter, J.,

https://github.com/jspotter/evhttpclient

HTTP client written in C++

Table 3: Results of experiments on real-world projects.

Project id

Project

LOC (files)

Transpiled

LOC (files) In

Transpiled

LOC Out

Tests Feature tested

I 2578 (41) 71 (1) 65 Procedural 3D Object Generato

22., 30.

II 450

(

)

450

(

)

474 Exam

le of librar

usa

e 29., 30.

III 7307

(

)

832

(

)

725 Unit tests with 113 assertions 5., 23., 30.

IV 2224 (4) 2067 (2) 1998

Program for filtering exemplary

ima

2., 30.

V 8101 (37) 161 (2) 126

Binaries for managing remote

memory systems

6., 30.

VI 23021 (99) 683 (3) 692 Four programs with experiments 7., 8., 9., 30.

VII 1441

(

)

111

(

)

68 Four

rams testin

functionalities 30., 32.

5.4 Threats to Validity

Several factors affect the validity of the evaluation

findings:

 Internal Validity – Limited feature support and

selective transpilation may overlook issues in

unsupported or complex code;

 External Validity - The selected projects, while

diverse, may not fully represent all C++14

applications, and testing was performed in a

specific environment;

 Construct Validity - Reliance on existing unit tests

assumes comprehensive coverage, which may

leave some issues undetected;

 Migration Strategies - To address these threats,

efforts were made to select a varied set of projects

from different domains and to document all

testing procedures and results meticulously in the

CppUp repository. Future evaluations will aim to

expand feature support and enable full project

transpilation;

 Developer Bias – The evaluation was conducted

internally; third-party reviews or independent test

suites could improve objectivity.

6 CONCLUSIONS

This paper presented CppUp as a practical solution

for modernizing legacy C++14 codebases to C++23,

addressing 20 critical features and ensuring

functional correctness. Systematic testing highlighted

its reliability and utility, although limitations persist.

CppUp currently lacks support for some deprecated

or removed features and cannot process entire files in

one pass due to the separate handling of

preprocessing and translation.

Future enhancements will focus on extending

parser capabilities, preserving comments, and

expanding feature support to improve compatibility

and facilitate more efficient and readable code

modernization. The scalability, practicality, and

Automated Migration of Legacy Code from the C++14 to C++23 Standard

555

detailed performance results of the tool will be

reassessed after these improvements.

Integration of AI is also a potential avenue for

further innovation, offering automated codebase

analysis, identification of deprecated features,

replacement suggestions, and validation of

correctness through automated testing.

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