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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 642bcdf55a
fix: handle universe polymorphism in ground grind theorems (#12226) 
This PR fixes a bug where `grind [foo]` fails when the theorem `foo` has
a different universe variable name than the goal, even though universe
polymorphism should allow the universes to unify.

The issue was in `instantiateGroundTheorem` (used for theorems with no
quantified parameters), which was passing `thm.proof` directly instead
of calling `getProofWithFreshMVarLevels`. This meant ground theorems
retained their original universe level params instead of getting fresh
level metavariables that could unify with the goal's universe levels.

Fixes
https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/grind.20fails.20because.20of.20universe.20variable.20name

🤖 Prepared with Claude Code

Co-authored-by: Claude <noreply@anthropic.com>
2026-02-17 01:51:37 +00:00
.claude doc: add test suite documentation to .claude/CLAUDE.md (#12421) 2026-02-10 21:42:06 +00:00
.github fix: nightly revision date logic and mathlib trigger auth (#12463) 2026-02-13 06:03:15 +00:00
doc fix: auto-update ProofWidgets4 pin in mathlib4 during releases (#12503) 2026-02-16 22:39:22 +00:00
images
releases_drafts chore: add release draft for the module system (#11359) 2025-11-26 15:01:07 +00:00
script fix: gate reference-manual tagging on release notes title correctness (#12512) 2026-02-17 01:20:36 +00:00
src fix: handle universe polymorphism in ground grind theorems (#12226) 2026-02-17 01:51:37 +00:00
stage0 chore: update stage0 2026-02-16 16:51:43 +00:00
tests fix: handle universe polymorphism in ground grind theorems (#12226) 2026-02-17 01:51:37 +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 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: 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 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
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 chore: updates to release_checklist.md (#7817) 2025-04-04 03:45:36 +00:00

README.md

This is the repository for Lean 4.

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Building from Source

See Building Lean.