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Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
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Henrik Böving 892475dcac
fix: LCNF casesOnCtor can only act if type correct (#12387) 
This PR fixes an issue in LCNF simp where it would attempt to act on
type incorrect `cases`
statements and look for a branch, otherwise panic. This issue did not
yet manifest in production as
various other invariants upheld by LCNF simp help mask it but will start
to become an issue with the
upcoming changes.

This is the proper fix for #6957.
2026-02-09 12:44:01 +00:00
.claude doc: add changelog label instructions to CLAUDE.md (#12227) 2026-01-29 03:24:23 +00:00
.github chore: revert "chore: CI: avoid fetching full repo in PR Release (#12309)" 2026-02-09 13:12:35 +00:00
doc doc: clarify release notes title format requirements (#12182) 2026-01-27 08:08:47 +00:00
images
releases_drafts chore: add release draft for the module system (#11359) 2025-11-26 15:01:07 +00:00
script chore: reformat all cmake files (#12218) 2026-01-28 18:23:08 +00:00
src fix: LCNF casesOnCtor can only act if type correct (#12387) 2026-02-09 12:44:01 +00:00
stage0 chore: update stage0 2026-02-07 11:52:08 +00:00
tests feat: some unification hints (#12341) 2026-02-09 04:51:13 +00:00
.gitattributes doc: grove: update and add String data (#11551) 2025-12-08 16:49:37 +00:00
.gitignore chore: add .vscode/settings.json to .gitignore (#10795) 2025-10-16 07:08:41 +00:00
.gitpod.Dockerfile
.gitpod.yml
.ignore
CMakeLists.txt chore: reformat all cmake files (#12218) 2026-01-28 18:23:08 +00:00
CMakePresets.json chore: CI: enable leak sanitizer again (#11339) 2025-11-27 18:32:35 +00:00
CODEOWNERS chore: make @hargoniX code owner of the compiler (#10732) 2025-10-10 04:43:38 +00:00
CONTRIBUTING.md
flake.lock
flake.nix chore: use lld if available for building core (#10694) 2025-10-08 16:47:30 +00:00
lean-toolchain
lean.code-workspace chore: lean.code-workspace: fix terminal cwd (#10802) 2025-10-16 20:19:12 +00:00
LICENSE
LICENSES
README.md doc: update URLs that are currently pointing to redirects (#10397) 2025-09-17 15:50:07 +00:00
RELEASES.md

README.md

This is the repository for Lean 4.

About

Installation

See Install Lean.

Contributing

Please read our Contribution Guidelines first.

Building from Source

See Building Lean.