Month 2026-04 focused on delivering ELPI vNext for ocaml/opam-repository (ELPI 3.7.0), enhancing the REPL, dependency management, and AST scoping APIs. Implemented new APIs to retrieve dependencies, map compilation units, and apply substitutions in CData. Updated tooling prerequisites and release docs to support broader platform compatibility. These changes improve build reliability, enable deeper code analysis, and streamline tooling around ELPI.

March 2026: Delivered ELPI 3.6.x series across three releases for ocaml/opam-repository, adding variadic predicates in the embeddable λProlog interpreter, refining the typechecker with clearer overload-resolution errors, and implementing storage optimizations for program signatures. Updated cross-platform dependencies (Menhir 2021-12-30, OCaml 4.14+) to improve stability on Linux, Windows, and macOS. These changes reduce debugging time, lower memory footprint for large programs, and improve build reliability across the platform suite.

December 2025 summary for ocaml/opam-repository: Delivered API enhancement for event deduplication and fixed critical ELPI packaging issues, aligning with the latest toolchains to improve reliability and upgradeability for downstream users.

November 2025 monthly summary: Delivered key ELPI-related features and stability improvements in ocaml/opam-repository, with a release that enhances language usability, safety, and unification workflows. Implemented new language attribute support and standard library functions, improved error handling, and corrected operator associativity to align with user expectations. Strengthened type-safety behavior by introducing an explicit collision error for type/typeabbrev scenarios. These changes reduce surface-area of errors, improve developer productivity, and enable more reliable downstream builds in OCaml tooling.

Month: 2025-10 — ocaml/opam-repository: Delivered a targeted Elpi release with lockstep ecosystem updates and a critical runtime bug fix.

September 2025 monthly summary for ocaml/opam-repository focusing on ELPI work and packaging updates. Key outcomes: ELPI language enhancements with new syntax and usability improvements, plus compatibility-focused packaging updates to streamline releases and downstream adoption. Overall impact: Improved language ergonomics, more reliable builds, and forward-looking compatibility with modern OCaml tooling and Menhir, enabling smoother upgrades for users and downstream projects. Technologies/skills demonstrated: OCaml/ELPI language design, parser and compiler improvements, release engineering, opam packaging, and compatibility maintenance with Menhir and OCaml versions.

Month 2025-08 — Key release-driven work on ocaml/opam-repository. Key features delivered: Elpi 3.1.0 release with language enhancements (constraints must be functions; variadic functions in func syntax) and dependency upgrades to Menhir 20211230 and OCaml 4.13+. Release anchored by commit 2e3d933f9ade30589e664c7c55b9d23397065689. Major bugs fixed: none reported. Overall impact: modernized tooling, improved language safety and compatibility for downstream packages; strengthens release processes and reduces maintenance cost. Technologies/skills demonstrated: OCaml ecosystem tooling, Menhir, opam-repository packaging, release management, dependency/version upgrades.

Month 2025-07 — Delivered substantive ELPI Interpreter upgrades in ocaml/opam-repository, focusing on 3.0.x core features and stability improvements. Achieved two releases (3.0.0 and 3.0.1) that expand functional capabilities, enhance error handling, and improve build reproducibility. The work tightened symbol handling and CHR rule/type-checking, setting a foundation for more reliable downstream builds and better developer experience.

June 2025 - jasmin: Maintained stability of the formal verification workflow by adapting the Jasmin Proof System to changes in the rocq-prover library. No new user-facing features shipped; the primary work was a compatibility fix that preserves correctness of the verification process and protects downstream tooling from breakage. This work ensured CI reliability and business continuity for formal verification pipelines.

February 2025 monthly summary for ocaml/opam-repository focused on delivering the Simple Event Library (sel) v0.6.0 release with a user-visible API enhancement and packaging updates. No major bugs reported in this period for this repo. The release improves queue inspection capabilities, packaging readiness, and downstream adoption, supported by updated opam metadata and build instructions.

In 2025-01, delivered a compatibility-focused update to the Coq-Elpi packaging in the coq/opam repo. Updated Opam metadata for Coq-elpi 2.4.0, adjusted dependencies to maintain compatibility with newer Coq and OCaml versions, and refreshed the source URL and checksum to reflect the new release. This work improves build reliability, reduces upgrade friction for downstream users, and lowers maintenance churn for developers relying on coq/opam.

December 2024 monthly summary: Packaging and release-engineering focused on Opam distribution readiness for the coq/opam repository. Delivered two Opam packages: coq-elpi v2.3.0 and coq-hierarchy-builder v1.7.1, enabling straightforward installation and distribution. Each package includes Opam metadata, dependencies, build/install instructions, and repository/source URL references, with commits captured for traceability. No major bugs reported this month; efforts concentrated on packaging discipline, metadata accuracy, and alignment with the Opam ecosystem. Impact includes improved installation experience for users, smoother CI/release workflows, and enhanced maintainability through standardized packaging templates and versioned artifacts. Technologies/skills demonstrated include Opam packaging, metadata standards, dependency specification, build automation, and repository metadata management.

November 2024 monthly summary for ocaml/opam-repository focusing on release-oriented maintenance and reliability improvements. Delivered SEL library 0.5.0 with resilience enhancements (deduplicating events on the same file descriptor and ensuring low-priority system events complete their rounds) and advanced the ELPI ecosystem with three releases that improve compatibility and stability across architectures. ELPI 2.0.2 includes a 32-bit test fix, ELPI 2.0.3 updates the interpreter, and ELPI 2.0.4 introduces a type-checker caching fix along with dependency and source URL updates.