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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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Leonardo de Moura 2964193af8
fix: avoid assigning mvar when Sym.intros produces no binders (#13451) 
This PR fixes a bug in `Sym.introCore.finalize` where the original
metavariable was unconditionally assigned via a delayed assignment, even
when no binders were introduced. As a result, `Sym.intros` would return
`.failed` while the goal metavariable had already been silently
assigned, confusing downstream code that relies on `isAssigned` (e.g. VC
filters in `mvcgen'`).

The test and fix were suggested by Sebastian Graf (@sgraf812).

Co-authored-by: Sebastian Graf <sgraf1337@gmail.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-04-17 21:47:47 +00:00
.claude chore: remove module build instructions from CLAUDE.md (#13386) 2026-04-13 10:08:33 +00:00
.github chore: CI: ignore compile_bench/channel in Linux Reldebug 2026-04-11 13:16:12 +02:00
.vscode chore: fixes from #13103 "enable separate codegen" (#13241) 2026-04-02 11:13:22 +00:00
doc chore: strip binaries only in release builds (#13208) 2026-03-31 17:18:43 +00:00
images
releases_drafts chore: remove stale release draft notes (#12518) 2026-02-17 19:56:23 +00:00
script fix: skip nightly-testing merge when branch does not exist (#13308) 2026-04-08 00:31:22 +00:00
src fix: avoid assigning mvar when Sym.intros produces no binders (#13451) 2026-04-17 21:47:47 +00:00
stage0 chore: update stage0 2026-04-17 16:13:04 +00:00
tests fix: avoid assigning mvar when Sym.intros produces no binders (#13451) 2026-04-17 21:47:47 +00:00
.gitattributes chore: migrate more tests to new test suite (#12809) 2026-03-06 16:52:01 +00:00
.gitignore chore: git ignore .claude/worktrees (#13299) 2026-04-07 09:51:39 +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
CMakeLists.txt chore: don't waste time building CMake mimalloc that we don't use (#13402) 2026-04-14 09:49:31 +00:00
CMakePresets.json chore: strip binaries only in release builds (#13208) 2026-03-31 17:18:43 +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

Installation

See Install Lean.

Contributing

Please read our Contribution Guidelines first.

Building from Source

See Building Lean.