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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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Henrik Böving bef8574b93
fix: be more careful when recording cases in the compiler (#11210) 
This PR fixes a bug in the LCNF simplifier unearthed while working on
#11078. In some situations caused by `unsafeCast`, the simplifier would
record incorrect information about `cases`, leading to further bugs down
the line.

Suppose we have `v : NonScalar` due to an `unsafeCast` and we run
`cases` on it, expecting `Prod.mk fst snd`. The current code attempts to
record both the arguments from the constructor application in the case
arm `fst`, `snd` and the parameters for the type by inspecting the discr
`v`. However, `NonScalar` does of course not have any parameters,
causing the simplifier to record wrong information. This patch makes the
`cases` infrastructure more cautious when extracting information from
the type of `v`.
2025-11-17 11:34:16 +00:00
.claude chore: basic dev instructions for Claude (#11074) 2025-11-04 04:07:53 +00:00
.github chore: CI: bump actions/upload-artifact from 4 to 5 (#11052) 2025-11-11 12:41:14 +00:00
doc feat: String.toList_map (#11021) 2025-11-01 13:54:39 +00:00
images
releases_drafts chore: updates to release_checklist.md (#7817) 2025-04-04 03:45:36 +00:00
script feat: #grind_lint command (#11157) 2025-11-13 00:42:18 +00:00
src fix: be more careful when recording cases in the compiler (#11210) 2025-11-17 11:34:16 +00:00
stage0 chore: update stage0 2025-11-16 10:13:26 +00:00
tests perf: use Nat-based bitmask in sparse cases construction (#11200) 2025-11-17 10:05:18 +00:00
.gitattributes fix: mark doc parser tests as eol=lf (#10344) 2025-09-11 11:19:01 +00:00
.gitignore chore: add .vscode/settings.json to .gitignore (#10795) 2025-10-16 07:08:41 +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
CMakeLists.txt chore: make USE_LAKE the default (#10016) 2025-08-21 11:43:25 +00:00
CMakePresets.json chore: fix reldebug preset (#8051) 2025-04-23 10:05:11 +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: robustify Nix shell (#8141) 2025-04-28 15:08:32 +00:00
flake.nix chore: use lld if available for building core (#10694) 2025-10-08 16:47:30 +00:00
lean-toolchain
lean.code-workspace chore: lean.code-workspace: fix terminal cwd (#10802) 2025-10-16 20:19:12 +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.

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Building from Source

See Building Lean.