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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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Kim Morrison 189cea9f80
chore: check for empty PRs in CI (#12956) 
This PR adds a CI check that fails when a PR introduces no changes
compared to its base branch. This catches cases where a duplicate PR is
queued for merge after an identical PR has already landed (as happened
with https://github.com/leanprover/lean4/pull/12876 and
https://github.com/leanprover/lean4/pull/12877).

The check is added as a second job in the existing `check-stage0.yml`
workflow, which already has the same trigger conditions and git setup
pattern. On `pull_request` events it diffs against the merge base; on
`merge_group` events it diffs `HEAD^1..HEAD` (the PR's contribution to
the synthetic merge commit). Note that batched merge groups are treated
as a unit — if the entire group is non-empty the check passes, which is
the right behaviour for lean4's typical single-PR queuing.

🤖 Prepared with Claude Code

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-03-23 03:09:52 +00:00
.claude chore: speed up test suite slightly (#12969) 2026-03-20 12:24:32 +00:00
.github chore: check for empty PRs in CI (#12956) 2026-03-23 03:09:52 +00:00
.vscode chore: replace workspace file with .vscode/ settings (#12770) 2026-03-04 01:10:04 +00:00
doc feat: unfold and rewrap instances in inferInstanceAs and deriving 2026-03-22 13:25:46 +01:00
images
releases_drafts chore: remove stale release draft notes (#12518) 2026-02-17 19:56:23 +00:00
script fix: handle lean4-nightly toolchain prefix in release checklist (#12865) 2026-03-23 03:01:58 +00:00
src feat: add control and arrow_telescope simproc DSL primitives (#13048) 2026-03-23 02:19:13 +00:00
stage0 chore: update stage0 2026-03-22 13:25:46 +01:00
tests feat: add control and arrow_telescope simproc DSL primitives (#13048) 2026-03-23 02:19:13 +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: add gitpod configuration (#6382) 2024-12-15 21:38:13 +00:00
.ignore chore: ignore stage0/ (for rg etc.) 2022-03-18 15:28:20 +01:00
CMakeLists.txt chore: make leantar available in stage0 (#12992) 2026-03-19 20:43:43 +00:00
CMakePresets.json chore: fix ci for new test suite (#12704) 2026-02-27 23:25:37 +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.