{
  "title": "Mutable Reference Cell and Lock",
  "origin_url": "https://lampwww.epfl.ch/funnel/esop2000.html",
  "license_guess": null,
  "code_sha256": "617cf3219582a33c11ac9283290ac75a36eca020e58a44f42960dcc91d63a2ec",
  "added_at": "2026-02-26T12:00:00Z"
}