ucsd-progsys/liquid-fixpoint
Oct 2025 – Mar 2026
3 Months active
Languages Used
Haskell
Technical Skills
Haskellfunctional programmingtype system designcompiler designtype systemsalgorithm design
Pieter Bos
PROFILE
Pieter Bos
Worked on the ucsd-progsys/liquid-fixpoint repository to enhance type system expressiveness and substitution infrastructure using Haskell and functional programming. Developed a generalized type system by extending expression handling from ExprV to ExprBV, enabling more flexible bindings and laying groundwork for future features. Upgraded the substitution engine by introducing KVarSubst and a Variable type family, supporting multi-type variable substitution and improving correctness in term rewriting. Delivered a Binder-based binding system and overhauled environment utilities, generalizing core types and refining symbol handling to prevent name capture. Focused on maintainability, extensibility, and robust logical reasoning in compiler and type system design.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
6Total
Bugs
0
Commits
6
Features
4
Lines of code
655
Activity Months3
Your Network
18 peopleShared Repositories
9
Work History
March 2026
3 Commits • 2 Features
Mar 1, 2026March 2026 performance highlights for ucsd-progsys/liquid-fixpoint: Delivered a Binder-based binding system and environment utilities, overhauled the substitution engine with safer symbol/name handling, and generalized core types to reduce constraints. These changes improve correctness, maintainability, and extensibility for bindings and substitutions, enabling safer future feature work and more reliable logical reasoning in LiquidHaskell workflows.
3 Commits • 2 Features
Mar 1, 2026March 2026 performance highlights for ucsd-progsys/liquid-fixpoint: Delivered a Binder-based binding system and environment utilities, overhauled the substitution engine with safer symbol/name handling, and generalized core types to reduce constraints. These changes improve correctness, maintainability, and extensibility for bindings and substitutions, enabling safer future feature work and more reliable logical reasoning in LiquidHaskell workflows.
March 2026
November 2025
2 Commits • 1 Features
Nov 1, 20252025-11 monthly summary for ucsd-progsys/liquid-fixpoint: Implemented core substitutions infrastructure upgrades focusing on KVar support and multi-type variable substitution. Enhances correctness of term rewriting, enables future optimizations, and lays groundwork for safer, scalable substitution across variable kinds.
November 2025
2 Commits • 1 Features
Nov 1, 20252025-11 monthly summary for ucsd-progsys/liquid-fixpoint: Implemented core substitutions infrastructure upgrades focusing on KVar support and multi-type variable substitution. Enhances correctness of term rewriting, enables future optimizations, and lays groundwork for safer, scalable substitution across variable kinds.
October 2025
1 Commits • 1 Features
Oct 1, 2025Month 2025-10: Implemented a targeted type-system enhancement by generalizing ExprV to ExprBV in ucsd-progsys/liquid-fixpoint, enabling varying bindings and broader expression handling. This foundation enables future user-facing features and strengthens type-checking expressiveness. No major bugs fixed this month; maintenance work focused on long-term robustness and feature readiness.
1 Commits • 1 Features
Oct 1, 2025Month 2025-10: Implemented a targeted type-system enhancement by generalizing ExprV to ExprBV in ucsd-progsys/liquid-fixpoint, enabling varying bindings and broader expression handling. This foundation enables future user-facing features and strengthens type-checking expressiveness. No major bugs fixed this month; maintenance work focused on long-term robustness and feature readiness.
October 2025
Activity
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Quality Metrics
Correctness83.4%
Maintainability80.0%
Architecture80.0%
Performance66.6%
AI Usage36.8%
Skills & Technologies
Programming Languages
Haskell
Technical Skills
Haskellalgorithm designcode refactoringcompiler designfunctional programmingsoftware designtype system designtype systems
Repositories Contributed To
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