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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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Joachim Breitner 34d00cb50d
feat: add checkSystem calls to bv_decide for cancellation responsiveness (#13284) 
This PR adds `checkSystem` calls to the `bv_decide` tactic's main loops
to improve IDE cancellation responsiveness. Previously, `bv_decide` had
zero `checkSystem` calls in its entire codebase, meaning long-running
invocations could not be cancelled promptly.

Insertion points:
- `fixpointPipeline` (normalization fixpoint loop)
- `ReifiedBVExpr.of.go` (recursive BitVec expression reification)
- `ReifiedBVLogical.of.go` (recursive boolean expression reification)
- `reflectBV` (hypothesis loop)

These cover the MetaM-based phases of `bv_decide`. The pure computation
phases (bitblasting via `IO.lazyPure`, AIG→CNF conversion) remain
without checks and would require restructuring to address.

Gap measurements (at 6.0 Ginstr/s, using
`LEAN_CHECK_SYSTEM_INTERVAL_INSN` from #13212):
- `bv_decide_large_aig.lean`: before ~3.3s max gap (19,899M insn),
after: pure bitblast/AIG gaps remain but reification and normalization
phases are now interruptible
- Other bv_decide bench files: normalization and reification loops are
now responsive to cancellation

Note: the largest remaining gaps in bv_decide benchmarks are in the
kernel type checker (proof term checking, up to 10.5s on
`bv_decide_mod.lean`) and in pure bitblasting — both out of scope for
this PR.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
2026-04-05 13:11:39 +00:00
.claude chore: add safety notes to release command (#13225) 2026-04-01 05:01:00 +00:00
.github fix: make -DLEAN_VERSION_* CMake overrides actually work (#13226) 2026-04-01 05:31:23 +00:00
.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: make -DLEAN_VERSION_* CMake overrides actually work (#13226) 2026-04-01 05:31:23 +00:00
src feat: add checkSystem calls to bv_decide for cancellation responsiveness (#13284) 2026-04-05 13:11:39 +00:00
stage0 chore: update stage0 2026-04-05 00:39:54 +00:00
tests feat: mark exposed match auxiliary declarations as implicit_reducible (#13281) 2026-04-04 23:55:47 +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
.gitpod.yml chore: strip binaries only in release builds (#13208) 2026-03-31 17:18:43 +00:00
.ignore
CMakeLists.txt chore: disable flaky tests (#13253) 2026-04-02 12:59:59 +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.

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Please read our Contribution Guidelines first.

Building from Source

See Building Lean.