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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 ee293de982
test: add instantiateMVars tests and benchmark for delayed assignments (#12808) 
This PR adds tests and a benchmark exercising `instantiateMVars` on
metavariable assignment graphs with nested delayed assignments, in
preparation for optimizing the delayed mvar resolution path.

- `tests/elab/instantiateMVarsShadow.lean`: Two test cases for
correctness when the same fvar is bound to different values at different
scope levels (fvar shadowing and late-bind patterns). A buggy cache
could return a stale result from one scope level in another.
- `tests/elab/instantiateMVarsSharing.lean`: Verifies correct resolution
and object sharing on a graph with nested delayed mvars producing `∀ s,
(s = s → (s = s) ∧ (s = s)) ∧ (s = s)`.
- `tests/elab_bench/delayed_assign.lean`: Constructs an O(n²) delayed
mvar graph (n=700) and measures `instantiateMVars` resolution time,
calibrated to ~1s total elaboration.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
2026-03-06 10:59:13 +00:00
.claude chore: improve CI failure reporting in release checklist (#12786) 2026-03-04 11:55:34 +00:00
.github feat: move instance-class check to declaration site (#12325) 2026-03-06 03:23:27 +00:00
.vscode chore: replace workspace file with .vscode/ settings (#12770) 2026-03-04 01:10:04 +00:00
doc chore: replace workspace file with .vscode/ settings (#12770) 2026-03-04 01:10:04 +00:00
images
releases_drafts chore: remove stale release draft notes (#12518) 2026-02-17 19:56:23 +00:00
script fix: handle CACHE STRING syntax in LEAN_VERSION_IS_RELEASE check (#12800) 2026-03-05 02:09:51 +00:00
src fix: remove @[grind →] from getElem_of_getElem? (#12821) 2026-03-06 04:18:21 +00:00
stage0 feat: move instance-class check to declaration site (#12325) 2026-03-06 03:23:27 +00:00
tests test: add instantiateMVars tests and benchmark for delayed assignments (#12808) 2026-03-06 10:59:13 +00:00
.gitattributes doc: grove: update and add String data (#11551) 2025-12-08 16:49:37 +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
CMakeLists.txt chore: fail build on non-make generators (#12690) 2026-02-25 13:59:40 +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
flake.lock chore: update to c++20 (#12117) 2026-02-11 01:17:40 +00:00
flake.nix chore: update to c++20 (#12117) 2026-02-11 01:17:40 +00:00
lean-toolchain chore: relative lean-toolchains (#12652) 2026-02-25 10:23:35 +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 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.