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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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Kyle Miller e804829101
feat: have #eval elaborate variables (#11427) 
This PR modifies `#eval e` to elaborate `e` with section variables in
scope. While evaluating expressions with free variables is not possible,
this lets `#eval` give a better error message than "unknown identifier."

Example:
```lean
section
variable (n : Nat)
/-- error: Cannot evaluate, contains free variable `n` -/
#guard_msgs in #eval n
end
```

The error is localized to `#eval`. It would be more friendly if the
error were to be placed on uses of free variables.

[Zulip
discussion](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/Unknown.20identifier.20error.20messages.20for.20.60.23eval.60/near/560864544)
2026-03-09 04:52:08 +00:00
.claude chore: improve CI failure reporting in release checklist (#12786) 2026-03-04 11:55:34 +00:00
.github fix: address unused simp theorem warnings (#12829) 2026-03-06 23:12:03 +00:00
.vscode chore: replace workspace file with .vscode/ settings (#12770) 2026-03-04 01:10:04 +00:00
doc chore: migrate more tests to new test suite (#12809) 2026-03-06 16:52:01 +00:00
images
releases_drafts chore: remove stale release draft notes (#12518) 2026-02-17 19:56:23 +00:00
script feat: unify name demangling with single Lean implementation (#12539) 2026-03-06 12:29:35 +00:00
src feat: have #eval elaborate variables (#11427) 2026-03-09 04:52:08 +00:00
stage0 chore: update stage0 2026-03-07 00:02:16 +00:00
tests feat: have #eval elaborate variables (#11427) 2026-03-09 04:52:08 +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: 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 doc: triage 2024-07-26 18:24:06 +02:00
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 feat: ship cadical (#4325) 2024-08-23 09:13:27 +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

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See Install Lean.

Contributing

Please read our Contribution Guidelines first.

Building from Source

See Building Lean.