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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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JovanGerb d69a8eff3f
fix: deduplicate elaboration of constant argument to rw (#8232) 
This PR fixes elaboration of constants in the `rewrite` tactic.
previously, `rw [eq_self]` would elaborate `eq_self` twice, and add it
to the infotree twice. This would lead to the "Expected type" being
delaborated with an unknown universe metavariable.

I added a test to show this error during delaboration of the "Expected
type".

This was reported on Zulip as a panic message during delaboration:
[#mathlib4 > Crash in `sup`/`inf` /
`max`/`min`
delaborators](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Crash.20in.20.60sup.60.2F.60inf.60.20.2F.20.60max.60.2F.60min.60.20delaborators/with/515946714)
2025-05-15 11:33:10 +00:00
.github chore: CI: replace Nix CI with Linux release (#8335) 2025-05-14 15:31:40 +00:00
doc chore: remove old documentation site (#7974) 2025-05-14 14:31:33 +00:00
images
nix chore: fix Nix build 2025-04-21 18:40:11 +02:00
releases_drafts chore: updates to release_checklist.md (#7817) 2025-04-04 03:45:36 +00:00
script chore: update release_checklist.py to check new release notes page (#8235) 2025-05-05 13:29:53 +00:00
src fix: deduplicate elaboration of constant argument to rw (#8232) 2025-05-15 11:33:10 +00:00
stage0 chore: update stage0 2025-05-14 23:49:50 +00:00
tests fix: deduplicate elaboration of constant argument to rw (#8232) 2025-05-15 11:33:10 +00:00
.gitattributes chore: Do not hide stage0/src/stdlib_flags.h from diffs 2023-09-13 19:29:25 +02:00
.gitignore chore: update .gitignore for release checklist scripts (#7810) 2025-04-03 23:55:48 +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 fix: cadical distribution on Linux (#8201) 2025-05-02 18:25:16 +00:00
CMakePresets.json chore: fix reldebug preset (#8051) 2025-04-23 10:05:11 +00:00
CODEOWNERS chore: add @zwarich to the compiler CODEOWNERS (#8305) 2025-05-12 18:42:54 +00:00
CONTRIBUTING.md doc: triage 2024-07-26 18:24:06 +02:00
flake.lock chore: robustify Nix shell (#8141) 2025-04-28 15:08:32 +00:00
flake.nix chore: robustify Nix shell (#8141) 2025-04-28 15:08:32 +00:00
lean-toolchain doc: VS Code dev setup (#2961) 2023-11-30 08:35:03 +00:00
lean.code-workspace chore: add the lean4 extension to the vscode workspace (#3059) 2023-12-14 08:58:21 +00:00
LICENSE chore: remove LICENSE header that confused GitHub 2021-11-18 09:42:35 +01:00
LICENSES feat: ship cadical (#4325) 2024-08-23 09:13:27 +00:00
README.md chore: remove old documentation site (#7974) 2025-05-14 14:31:33 +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 Setting Up Lean.

Contributing

Please read our Contribution Guidelines first.

Building from Source

See Building Lean.