facebook/infer
Jun 2025 – Apr 2026
7 Months active
Languages Used
MakefileRustShellMLMarkdownOCaml
Technical Skills
Build SystemsRustSoftware DevelopmentStatic AnalysisCompiler DevelopmentOCaml
Arjan Seijs
PROFILE
Arjan Seijs
Arjan Seijs developed and expanded Rust language support in the facebook/infer static analysis tool, focusing on robust integration of Rust’s MIR and Charon IR translation pipelines. Over seven months, Arjan engineered features such as heap-allocated box types, discriminant-based enum modeling, and direct ullbc data capture, enabling precise analysis of Rust-specific constructs like references, aggregates, and control flow. Working primarily in OCaml and Rust, Arjan emphasized code quality, error handling, and test coverage, stabilizing the Rust analysis path and improving maintainability. The work addressed complex data structures and memory management, laying a strong foundation for future Rust analysis in Infer.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
13Total
Bugs
0
Commits
13
Features
8
Lines of code
10,351
Activity Months7
Work History
April 2026
1 Commits • 1 Features
Apr 1, 2026April 2026: Delivered Rust Enums, Switch Cases, and Error Handling Support for the Infer analyzer on facebook/infer. Implemented discriminant-based Enum modeling (base type with discriminant; variants as subtypes), support for the switch terminator on enums, and translation of function unwinds for error handling. Added pruning scaffolds for discriminant-based pruning to improve analysis performance. PR 2029 merged; review by ngorogiannis; differential Revision D99408380; codebase stabilized for Rust workflows.
1 Commits • 1 Features
Apr 1, 2026April 2026: Delivered Rust Enums, Switch Cases, and Error Handling Support for the Infer analyzer on facebook/infer. Implemented discriminant-based Enum modeling (base type with discriminant; variants as subtypes), support for the switch terminator on enums, and translation of function unwinds for error handling. Added pruning scaffolds for discriminant-based pruning to improve analysis performance. PR 2029 merged; review by ngorogiannis; differential Revision D99408380; codebase stabilized for Rust workflows.
April 2026
March 2026
3 Commits • 2 Features
Mar 1, 2026Concise monthly summary for 2026-03 focusing on key accomplishments, top business/value deliverables, and technical excellence.
March 2026
3 Commits • 2 Features
Mar 1, 2026Concise monthly summary for 2026-03 focusing on key accomplishments, top business/value deliverables, and technical excellence.
February 2026
5 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary for facebook/infer focusing on Rust language support enhancements. Delivered end-to-end Rust language support in the Infer static analysis tool, including operators, terminator handling, references and raw pointers, aggregate types (structs and arrays), and tuple types, enabling more accurate analysis of Rust code paths and data structures. Additionally stabilized the Rust test suite by mitigating flaky tests and enabling more coverage, improving reliability of Rust-related analyses. This work increases confidence in Infer's Rust analysis, reduces manual debugging, and broadens applicability to Rust codebases across client projects.
5 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary for facebook/infer focusing on Rust language support enhancements. Delivered end-to-end Rust language support in the Infer static analysis tool, including operators, terminator handling, references and raw pointers, aggregate types (structs and arrays), and tuple types, enabling more accurate analysis of Rust code paths and data structures. Additionally stabilized the Rust test suite by mitigating flaky tests and enabling more coverage, improving reliability of Rust-related analyses. This work increases confidence in Infer's Rust analysis, reduces manual debugging, and broadens applicability to Rust codebases across client projects.
February 2026
December 2025
1 Commits • 1 Features
Dec 1, 2025December 2025: Delivered a focused feature expansion for the facebook/infer repo by enabling direct ullbc data capture through CLI and an accompanying RustULLBC driver, complemented by expanded Rust frontend testing and PR-driven code quality improvements. This establishes a stronger data capture pipeline to accelerate debugging and issue reproduction.
December 2025
1 Commits • 1 Features
Dec 1, 2025December 2025: Delivered a focused feature expansion for the facebook/infer repo by enabling direct ullbc data capture through CLI and an accompanying RustULLBC driver, complemented by expanded Rust frontend testing and PR-driven code quality improvements. This establishes a stronger data capture pipeline to accelerate debugging and issue reproduction.
November 2025
1 Commits • 1 Features
Nov 1, 2025November 2025 highlights: Delivered the initial Rust program translation layer and minimal function data structures in Infer, establishing a foundation for Rust code analysis and verification within the existing IR workflow.
1 Commits • 1 Features
Nov 1, 2025November 2025 highlights: Delivered the initial Rust program translation layer and minimal function data structures in Infer, establishing a foundation for Rust code analysis and verification within the existing IR workflow.
November 2025
October 2025
1 Commits • 1 Features
Oct 1, 20252025-10 monthly summary for facebook/infer: Delivered Rust code analysis via Charon IR translation by integrating the Charon library, replacing the previous custom Rust analysis library. Updated build configurations and test scaffolding to support Charon's JSON intermediate representation, enabling Infer to analyze Rust code through Charon's IR pipeline. This work strengthens Rust support, reduces maintenance of bespoke tooling, and sets the foundation for broader IR-based analysis.
October 2025
1 Commits • 1 Features
Oct 1, 20252025-10 monthly summary for facebook/infer: Delivered Rust code analysis via Charon IR translation by integrating the Charon library, replacing the previous custom Rust analysis library. Updated build configurations and test scaffolding to support Charon's JSON intermediate representation, enabling Infer to analyze Rust code through Charon's IR pipeline. This work strengthens Rust support, reduces maintenance of bespoke tooling, and sets the foundation for broader IR-based analysis.
June 2025
1 Commits • 1 Features
Jun 1, 2025June 2025: Delivered initial Rust support in Infer Static Analysis with MIR-based memory-error detection for unsafe Rust. No major bugs fixed this month; focus was on building the Rust analysis path and validating its integration. This work expands language coverage, enhances safety for Rust code, and lays the groundwork for broader Rust checks in the Infer pipeline. Technologies demonstrated include Rust, MIR, static analysis integration, and cross-language tooling.
1 Commits • 1 Features
Jun 1, 2025June 2025: Delivered initial Rust support in Infer Static Analysis with MIR-based memory-error detection for unsafe Rust. No major bugs fixed this month; focus was on building the Rust analysis path and validating its integration. This work expands language coverage, enhances safety for Rust code, and lays the groundwork for broader Rust checks in the Infer pipeline. Technologies demonstrated include Rust, MIR, static analysis integration, and cross-language tooling.
June 2025
Activity
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Quality Metrics
Correctness86.2%
Maintainability81.6%
Architecture83.0%
Performance78.4%
AI Usage52.2%
Skills & Technologies
Programming Languages
MLMakefileMarkdownOCamlRustShell
Technical Skills
Build SystemsCode Quality ImprovementCommand Line InterfaceCompiler DesignCompiler DevelopmentControl FlowData StructuresDebuggingEnum HandlingError HandlingFunctional ProgrammingMemory ManagementOCamlRustSoftware Development
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