Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
525021c01e
This PR exposes the `Pure.pure` / `Bind.bind` applications emitted by the `do` elaborator as pluggable closures, so external surface syntaxes (e.g. an `ido` notation for indexed monads) can reuse the full `do` machinery while emitting alternate constants. `Context` carries a new `DoOps` record (wrapped via an opaque `DoOpsRef` to break the cycle with `DoElabM`) with `mkPureApp`, `mkBindApp`, and `isPureApp?` fields. `mkPureApp` and `mkBindApp` become thin dispatchers; the original bodies move to `DoOps.default`. `isPureApp?` returns the pure value as an `Expr` rather than a `Bool`, so overrides aren't locked into `Pure.pure`'s 4-argument layout. A new `elabDoWith` entry point takes a `DoOps` plus a `doSeq`; `elabDo` is now `elabDoWith .default` applied to a matched ``(do $doSeq)``. Control-flow features (`mut`, `return`, `break`, `continue`, `for`) and the transformer stack (`StateT`, `OptionT`, `ExceptT`, `EarlyReturnT`, `BreakT`, `ContinueT`) remain hard-coded to `Monad`; generalising them is deferred to a follow-up. A new `tests/elab/doNotationPluggableOps.lean` registers an Atkey-style indexed monad and an `ido` surface syntax that drives `elabDoWith`, covering the forms of `do` that are supported under the minimal scope. |
||
|---|---|---|
| .claude | ||
| .github | ||
| .vscode | ||
| doc | ||
| images | ||
| releases_drafts | ||
| script | ||
| src | ||
| stage0 | ||
| tests | ||
| .gitattributes | ||
| .gitignore | ||
| .gitpod.Dockerfile | ||
| .gitpod.yml | ||
| .ignore | ||
| AGENTS.md | ||
| CMakeLists.txt | ||
| CMakePresets.json | ||
| CODEOWNERS | ||
| CONTRIBUTING.md | ||
| flake.lock | ||
| flake.nix | ||
| lean-toolchain | ||
| LICENSE | ||
| LICENSES | ||
| README.md | ||
| RELEASES.md | ||
This is the repository for Lean 4.
About
- Quickstart
- Homepage
- Theorem Proving Tutorial
- Functional Programming in Lean
- Documentation Overview
- Language Reference
- Release notes starting at v4.0.0-m3
- Examples
- External Contribution Guidelines
Installation
See Install Lean.
Contributing
Please read our Contribution Guidelines first.
Building from Source
See Building Lean.