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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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Joachim Breitner d48863fc2b
fix: add checkInterrupted to Core.withIncRecDepth (#13290) 
This PR adds a `checkInterrupted` call to `Core.withIncRecDepth`, so
that all recursive CoreM-based operations (inferType, whnf, isDefEq,
simp, …) check for cancellation on each recursion step. Previously,
these operations could run for seconds without responding to IDE
cancellation requests.

This is the single highest-impact change for IDE cancellation
responsiveness. It covers all recursive MetaM/TacticM operations at
once, eliminating the vast majority of multi-second gaps identified by
the `LEAN_CHECK_SYSTEM_INTERVAL_MS` monitoring in #13212.

Gap measurements pending — will be added after CI benchmarks and
instrumented measurement.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
2026-04-06 13:45:30 +00:00
.claude chore: add safety notes to release command (#13225) 2026-04-01 05:01:00 +00:00
.github fix: make -DLEAN_VERSION_* CMake overrides actually work (#13226) 2026-04-01 05:31:23 +00:00
.vscode chore: fixes from #13103 "enable separate codegen" (#13241) 2026-04-02 11:13:22 +00:00
doc chore: strip binaries only in release builds (#13208) 2026-03-31 17:18:43 +00:00
images
releases_drafts chore: remove stale release draft notes (#12518) 2026-02-17 19:56:23 +00:00
script fix: make -DLEAN_VERSION_* CMake overrides actually work (#13226) 2026-04-01 05:31:23 +00:00
src fix: add checkInterrupted to Core.withIncRecDepth (#13290) 2026-04-06 13:45:30 +00:00
stage0 chore: update stage0 2026-04-05 00:39:54 +00:00
tests feat: add Sym.Arith infrastructure for arithmetic normalization (#13289) 2026-04-06 05:21:09 +00:00
.gitattributes chore: migrate more tests to new test suite (#12809) 2026-03-06 16:52:01 +00:00
.gitignore chore: replace workspace file with .vscode/ settings (#12770) 2026-03-04 01:10:04 +00:00
.gitpod.Dockerfile chore: add gitpod configuration (#6382) 2024-12-15 21:38:13 +00:00
.gitpod.yml chore: strip binaries only in release builds (#13208) 2026-03-31 17:18:43 +00:00
.ignore chore: ignore stage0/ (for rg etc.) 2022-03-18 15:28:20 +01:00
CMakeLists.txt chore: disable flaky tests (#13253) 2026-04-02 12:59:59 +00:00
CMakePresets.json chore: strip binaries only in release builds (#13208) 2026-03-31 17:18:43 +00:00
CODEOWNERS chore: make @hargoniX code owner of the compiler (#10732) 2025-10-10 04:43:38 +00:00
CONTRIBUTING.md chore: migrate pkg tests (#12889) 2026-03-11 18:55:46 +00:00
flake.lock chore: update to c++20 (#12117) 2026-02-11 01:17:40 +00:00
flake.nix chore: add aarch64-darwin to flake (#12915) 2026-03-18 15:55:34 +00:00
lean-toolchain chore: relative lean-toolchains (#12652) 2026-02-25 10:23:35 +00:00
LICENSE chore: remove LICENSE header that confused GitHub 2021-11-18 09:42:35 +01:00
LICENSES feat: bundle leantar with Lean (#12822) 2026-03-09 20:10:59 +00:00
README.md doc: update URLs that are currently pointing to redirects (#10397) 2025-09-17 15:50:07 +00:00
RELEASES.md chore: updates to release_checklist.md (#7817) 2025-04-04 03:45:36 +00:00

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.