Plausible

What it does

Arbitrary instances

The README says users can derive `Arbitrary` for algebraic data types or use a top-level deriving command for multiple types.checked 8 Oct 2026

Built-in types

The README says Plausible usually handles built-in types without additional setup.checked 8 Oct 2026

Counterexamples

The README shows the `plausible` tactic finding and displaying a counterexample to a proposition.checked 8 Oct 2026

Counterexample search

The README shows the `plausible` tactic finding a counterexample for a false property involving arrays.checked 9 Oct 2026

Custom types

The README says custom types need `Repr`, `Plausible.Shrinkable`, and `Plausible.SampleableExt` instances, or `Plausible.Arbitrary`.checked 9 Oct 2026

Deriving Arbitrary

The README documents deriving `Arbitrary` for algebraic data types, including with a top-level `deriving instance` command.checked 9 Oct 2026

Documentation

The README directs users to the module documentation for more information.checked 8 Oct 2026

License

The repository identifies its license as Apache-2.0.checked 9 Oct 2026

Product

Plausible is a property testing framework for Lean 4 that integrates into the tactic framework.checked 8 Oct 2026

Programmatic checking

The README shows properties being checked with `Plausible.Testable.check`.checked 9 Oct 2026

Property checking

The README demonstrates checking a property with `Plausible.Testable.check`.checked 8 Oct 2026

Purpose

Plausible is a property testing framework for Lean 4 that integrates into the tactic framework.checked 9 Oct 2026