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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 036bd4f0df
fix: withoutExporting around diagnostic reporting (#13630) 
This PR fixes an "Unknown constant" error when `set_option diagnostics
true` is enabled in module mode under a `public section`. Diagnostic
output may reference private declarations such as `_match_*` and
`_sparseCasesOn_*` that are recorded in unfold counters; constructing
the message previously failed because the environment was in exporting
mode and could not resolve those names. The diagnostic-printing paths in
`Lean.Meta.Diagnostics.reportDiag` and
`Lean.Meta.Tactic.Simp.Diagnostics.reportDiag` now run under
`withoutExporting`.

Closes https://github.com/leanprover/lean4/issues/13581.

🤖 Prepared with Claude Code

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-06 13:47:26 +00:00
.claude chore: update release tooling and docs (#13631) 2026-05-04 15:33:36 +00:00
.github chore: rename reldebug preset to more appropriate relwithassert (#13657) 2026-05-06 13:27:53 +00:00
.vscode chore: fixes from #13103 "enable separate codegen" (#13241) 2026-04-02 11:13:22 +00:00
doc doc: how to LLVM upgrade (#13656) 2026-05-06 10:03:53 +00:00
images
releases_drafts chore: remove stale release draft notes (#12518) 2026-02-17 19:56:23 +00:00
script chore: update release tooling and docs (#13631) 2026-05-04 15:33:36 +00:00
src fix: withoutExporting around diagnostic reporting (#13630) 2026-05-06 13:47:26 +00:00
stage0 chore: update stage0 2026-05-05 18:38:42 +00:00
tests fix: withoutExporting around diagnostic reporting (#13630) 2026-05-06 13:47:26 +00:00
.gitattributes chore: migrate more tests to new test suite (#12809) 2026-03-06 16:52:01 +00:00
.gitignore chore: update release tooling and docs (#13631) 2026-05-04 15:33:36 +00:00
.gitpod.Dockerfile chore: add gitpod configuration (#6382) 2024-12-15 21:38:13 +00:00
.gitpod.yml chore: strip binaries only in release builds (#13208) 2026-03-31 17:18:43 +00:00
.ignore
AGENTS.md chore: add AGENTS.md symlink to CLAUDE.md (#13461) 2026-04-18 06:48:05 +00:00
CMakeLists.txt chore: use the lean-llvm LLVM for benchmarking (#13634) 2026-05-05 14:26:08 +00:00
CMakePresets.json chore: rename reldebug preset to more appropriate relwithassert (#13657) 2026-05-06 13:27:53 +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
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

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See Install Lean.

Contributing

Please read our Contribution Guidelines first.

Building from Source

See Building Lean.