facebook/infer
Jun 2025 – Jun 2026
9 Months active
Languages Used
MakefileRustShellMLMarkdownOCaml
Technical Skills
Build SystemsRustSoftware DevelopmentStatic AnalysisCompiler DevelopmentOCaml
Arjan Seijs
PROFILE
Arjan Seijs
Worked on expanding Rust language support in the facebook/infer static analysis tool, focusing on memory safety and accurate modeling of Rust constructs. Developed features such as MIR-based memory-error detection, elaborated Box and NonNull abstractions, and discriminant-based enum handling, integrating these into the analysis pipeline using Rust, OCaml, and Makefile. Enhanced the tool’s ability to analyze complex Rust data structures, control flow, and error handling, while improving test coverage and code quality. Upgraded dependencies and build systems to support new IR translation layers, enabling more precise static analysis and reducing manual debugging for Rust codebases in real-world scenarios.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
15Total
Bugs
0
Commits
15
Features
10
Lines of code
133,544
Activity Months9
Work History
June 2026
1 Commits • 1 Features
Jun 1, 2026June 2026: Delivered a substantial feature enhancement in facebook/infer for Rust memory-modeling accuracy. Implemented Elaborated Box Representation and Drop Modeling, introducing Rust-level abstractions for Box and NonNull to align with compiler handling and ABI equivalence, with support for specific compiler flags. Partial support for modeling drops when retrieving drop glue with --desugar-drops laid groundwork for precise drop analysis.
1 Commits • 1 Features
Jun 1, 2026June 2026: Delivered a substantial feature enhancement in facebook/infer for Rust memory-modeling accuracy. Implemented Elaborated Box Representation and Drop Modeling, introducing Rust-level abstractions for Box and NonNull to align with compiler handling and ABI equivalence, with support for specific compiler flags. Partial support for modeling drops when retrieving drop glue with --desugar-drops laid groundwork for precise drop analysis.
June 2026
May 2026
1 Commits • 1 Features
May 1, 2026May 2026 monthly summary: Focused on foundational MIR enhancements in Charon for the Infer project, establishing an elaborated MIR state and improved box representation. Delivered the Charón MIR Box Representation and Elaboration feature, upgraded Charon to v0.1.177 to enable precise-drops, and connected the work to PR #2035. The changes set the stage for future box-level support and improved analysis precision across code that uses box-like patterns, driving more reliable static analysis results for real-world codebases.
May 2026
1 Commits • 1 Features
May 1, 2026May 2026 monthly summary: Focused on foundational MIR enhancements in Charon for the Infer project, establishing an elaborated MIR state and improved box representation. Delivered the Charón MIR Box Representation and Elaboration feature, upgraded Charon to v0.1.177 to enable precise-drops, and connected the work to PR #2035. The changes set the stage for future box-level support and improved analysis precision across code that uses box-like patterns, driving more reliable static analysis results for real-world codebases.
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
Correctness85.4%
Maintainability81.4%
Architecture82.6%
Performance78.6%
AI Usage52.0%
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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