https://github.com/paulcadman/lean-effects

https://github.com/paulcadman/lean-effects

algebraic-effects lean lean4

Last synced: 3 months ago
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• Host: GitHub
• URL: https://github.com/paulcadman/lean-effects
• Owner: paulcadman
• License: apache-2.0
• Created: 2026-01-23T13:55:31.000Z (5 months ago)
• Default Branch: main
• Last Pushed: 2026-03-27T14:43:53.000Z (3 months ago)
• Last Synced: 2026-03-27T22:54:46.845Z (3 months ago)
• Topics: algebraic-effects, lean, lean4
• Language: Lean
• Homepage:
• Size: 1.28 MB
• Stars: 4
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# lean-effects

`lean-effects` is an algebraic effects library for Lean that supports scoped effects.

The implementation is based on an [Agda library](https://github.com/JonasHoefer/scoped-effects-agda) by Jonas Höfer.

## Example:

```lean

import Effects

open scoped Container

open State

def tickTwice {effs : List Effect} [State Nat ∈ effs] : Prog effs Nat := do

  let n ← get

  put (n + 1)

  let n ← get

  put (n + 1)

  get

def ex : Nat :=

  tickTwice

  |> State.eval 0

  |> Prog.run

#guard ex = 2

```