swiftlang/swift
Jun 2026 – Jun 2026
1 Month active
Languages Used
C++Swift
Technical Skills
ASTAST manipulationC++C++ programmingCompiler DesignCompiler Development
Paul Passeron
PROFILE
Paul Passeron
Worked on foundational macro-based conformance features in the swiftlang/swift repository, focusing on enabling Swift conformances to be derived via macros. Developed TypeInfo representations and parsing utilities in C++ and Swift, laying the groundwork for future macro-driven synthesis of protocols like Equatable and Codable. Enhanced the Swift macro system by improving AST manipulation and introducing safer handling for synthetic macro source files, which increased the reliability of generated CodingKeys. Introduced infrastructure and gating mechanisms, such as the DeriveConformancesViaMacros flag, to support incremental rollout and maintain compatibility. These efforts established a scalable path for macro-driven code generation and compiler maintainability.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
7Total
Bugs
0
Commits
7
Features
2
Lines of code
1,911
Activity Months1
Your Network
821 peopleSame Organization
@apple.com622
Shared Repositories
199
Work History
June 2026
7 Commits • 2 Features
Jun 1, 2026June 2026: Macro-based conformance groundwork and safer macro tooling. Delivered foundational TypeInfo representations and parsing utilities to enable deriving Swift conformances via macros, with infrastructure to migrate existing derived conformances. Improved Swift Macros: safer AST handling for synthetic macro source files and more reliable CodingKeys generation by using the target start location. Introduced experimental DeriveConformancesViaMacros flag to gate new paths and prepared for future conformance synthesis (e.g., Equatable, Hashable, Codable). Reverted an experimental change to maintain compatibility during early rollout. These efforts establish a scalable pathway to macro-driven code generation, enhancing developer productivity and compiler maintainability.
7 Commits • 2 Features
Jun 1, 2026June 2026: Macro-based conformance groundwork and safer macro tooling. Delivered foundational TypeInfo representations and parsing utilities to enable deriving Swift conformances via macros, with infrastructure to migrate existing derived conformances. Improved Swift Macros: safer AST handling for synthetic macro source files and more reliable CodingKeys generation by using the target start location. Introduced experimental DeriveConformancesViaMacros flag to gate new paths and prepared for future conformance synthesis (e.g., Equatable, Hashable, Codable). Reverted an experimental change to maintain compatibility during early rollout. These efforts establish a scalable pathway to macro-driven code generation, enhancing developer productivity and compiler maintainability.
June 2026
Activity
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Quality Metrics
Correctness94.2%
Maintainability94.2%
Architecture94.2%
Performance88.6%
AI Usage28.6%
Skills & Technologies
Programming Languages
C++Swift
Technical Skills
ASTAST manipulationC++C++ programmingCompiler DesignCompiler DevelopmentMacro DevelopmentSwiftSwift LanguageSwift programmingSyntax Parsingcompiler designmacro developmentmacro systems
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