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Formal Semantics and Program Logics for a Fragment of OCaml

Talkat ICFP 2025 · 2025-10-12..10-18
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Defines OLang, a sequential OCaml fragment with first-class functions, extensible ADTs, pattern matching, references, exceptions and effect handlers, and gives a concrete semantics: a layered monadic interpreter running on a custom micro monad whose computations are trees with a small‑step relation. Two logics are built: a stateless Hoare logic for pure code and an Iris‑based Separation Logic for impure code. The Coq/RoCK development extracts to OCaml and its semantics is validated against compiler behavior; concurrency and typed modules are work in progress.

AI-written summary · about

  1. 0:00Formal semantics for OCaml
  2. 3:55Layered monadic interpreter
  3. 6:24Effect handlers in OCaml
  4. 8:53Monadic combinators for effects
  5. 10:38Stepping semantics hybrid
  6. 13:50Program logics architecture
  7. 17:22Pure vs impure logics
  8. 18:50Concurrency validation
  9. 19:33Q&A
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