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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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Sebastian Graf e3d42400ce
feat: inject unreachable! after break-less repeat (#13506) 
This PR appends `unreachable!` to the expansion of `break`-less `repeat`
when the expected result type does not unify with `PUnit`. The
continuation then has a polymorphic value, so the enclosing do block's
result type is inferred without a user-written filler, and `ControlInfo`
for break-less `repeat` can report `noFallthrough` honestly — dead-code
warnings on subsequent elements are now actionable.

Co-authored-by: Rob23oba <robin.arnez@web.de>
2026-04-23 07:16:03 +00:00
.claude chore: remove module build instructions from CLAUDE.md (#13386) 2026-04-13 10:08:33 +00:00
.github chore: don't fail on running build bench on built stage3 (#13467) 2026-04-18 22:07:21 +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: skip nightly-testing merge when branch does not exist (#13308) 2026-04-08 00:31:22 +00:00
src feat: inject unreachable! after break-less repeat (#13506) 2026-04-23 07:16:03 +00:00
stage0 chore: update stage0 2026-04-21 15:22:01 +00:00
tests feat: inject unreachable! after break-less repeat (#13506) 2026-04-23 07:16:03 +00:00
.gitattributes chore: migrate more tests to new test suite (#12809) 2026-03-06 16:52:01 +00:00
.gitignore chore: git ignore .claude/worktrees (#13299) 2026-04-07 09:51:39 +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
AGENTS.md chore: add AGENTS.md symlink to CLAUDE.md (#13461) 2026-04-18 06:48:05 +00:00
CMakeLists.txt fix: leantar architecture detection for Linux aarch64 (#13499) 2026-04-22 05:20:59 +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.