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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 bd091f119b
chore: fix bv_omega regression since v4.9.0 (#4579) 
This example, reported from LNSym, started failing when we changed the
definition of `Fin.sub` in
https://github.com/leanprover/lean4/pull/4421.

When we use the new definition, `omega` produces a proof term that the
kernel is very slow on.

To work around this for now, I've removed `BitVec.toNat_sub` from the
`bv_toNat` simp set,
and replaced it with `BitVec.toNat_sub'` which uses the old definition
for subtraction.

This is only a workaround, and I would like to understand why the term
chokes the kernel.

```
example
    (n : Nat)
    (addr2 addr1 : BitVec 64)
    (h0 : n ≤ 18446744073709551616)
    (h1 : addr2 + 18446744073709551615#64 - addr1 ≤ BitVec.ofNat 64 (n - 1))
    (h2 : addr2 - addr1 ≤ addr2 + 18446744073709551615#64 - addr1) :
    n = 18446744073709551616 := by
  bv_omega
```
2024-06-28 01:20:08 +00:00
.github chore: mark releases as prerelease (#4544) 2024-06-24 01:04:04 +00:00
doc doc: documenting Char and upstreaming extensionality from batteries (#4438) 2024-06-16 00:43:34 +00:00
images chore(CMakeLists.txt): move Lean logo to make sure we can test leanemacs without installing Lean 2015-01-31 17:38:49 -08:00
nix chore: Nix: fix cacheRoots 2024-06-21 23:35:38 +02:00
releases_drafts feat: add a linter for local vars that clash with their constructors (#4301) 2024-06-14 13:03:09 +00:00
script feat: support Lake for building Lean core oleans (#3886) 2024-06-13 16:18:24 +00:00
src chore: fix bv_omega regression since v4.9.0 (#4579) 2024-06-28 01:20:08 +00:00
stage0 chore: update stage0 2024-06-28 00:55:47 +02:00
tests chore: fix bv_omega regression since v4.9.0 (#4579) 2024-06-28 01:20:08 +00:00
.gitattributes chore: Do not hide stage0/src/stdlib_flags.h from diffs 2023-09-13 19:29:25 +02:00
.gitignore feat: support Lake for building Lean core oleans (#3886) 2024-06-13 16:18:24 +00:00
.ignore chore: ignore stage0/ (for rg etc.) 2022-03-18 15:28:20 +01:00
CMakeLists.txt chore: update-stage0-commit cmake target (#3692) 2024-04-04 13:35:53 +00:00
CMakePresets.json chore: modernize build instructions (#4032) 2024-05-23 10:55:07 +00:00
CODEOWNERS chore: update code owners 2024-04-24 10:16:16 +02:00
CONTRIBUTING.md doc: Adjust contributor's docs to squash merging (#2927) 2023-11-21 10:13:43 +00:00
flake.lock chore: test results as job summary (#3715) 2024-03-27 10:14:33 +00:00
flake.nix chore: nix shell: add gdb (#4476) 2024-06-18 11:07:20 +00:00
lean-toolchain doc: VS Code dev setup (#2961) 2023-11-30 08:35:03 +00:00
lean.code-workspace chore: add the lean4 extension to the vscode workspace (#3059) 2023-12-14 08:58:21 +00:00
LICENSE chore: remove LICENSE header that confused GitHub 2021-11-18 09:42:35 +01:00
LICENSES chore: add GMP license for now 2021-11-18 09:42:35 +01:00
README.md doc: mention build doc source location (#4045) 2024-05-01 22:42:54 +00:00
RELEASES.md chore: begin development cycle for v4.10.0 (#4374) 2024-06-06 12:06:13 +00:00

README.md

This is the repository for Lean 4.

About

Installation

See Setting Up Lean.

Contributing

Please read our Contribution Guidelines first.

Building from Source

See Building Lean (documentation source: doc/make/index.md).