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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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Joe Hendrix 0963f3476c
chore: extend GetElem with getElem! and getElem? (#3694) 
This makes changes to the `GetElem` class so that it does not lead to
unnecessary overhead in container like `RBMap`.

The changes are to:
1. Make `getElem?` and `getElem!` part of the `GetElem` class so they
can be overridden in instances.
2. Introduce a `LawfulGetElem` class that contains correctness theorems
for `getElem?` and `getElem!` using the original definitions.
3. Reorganize definitions (e.g, by moving `GetElem` out of
`Init.Prelude`) so that the `GetElem` changes are feasible.
4. Provide `LawfulGetElem` instances to complement all existing
`GetElem` instances in Lean core.

To reduce the size of the PR, this doesn't do the work of providing new
`GetElem` instances for `RBMap`, `HashMap` etc. That will be done in a
separate PR (#3688) that depends on this.

---------

Co-authored-by: Mac Malone <tydeu@hatpress.net>
2024-03-28 01:42:00 +00:00
.github chore: fix rebase suggestion for Mathlib CI (#3701) 2024-03-27 23:46:06 +00:00
doc chore: test results as job summary (#3715) 2024-03-27 10:14:33 +00:00
images
nix chore: test results as job summary (#3715) 2024-03-27 10:14:33 +00:00
script fix: C++ exceptions across shared libraries on Linux (#3500) 2024-02-26 10:35:11 +00:00
src chore: extend GetElem with getElem! and getElem? (#3694) 2024-03-28 01:42:00 +00:00
stage0 chore: update stage0 2024-03-27 07:34:13 +00:00
tests chore: extend GetElem with getElem! and getElem? (#3694) 2024-03-28 01:42:00 +00:00
.gitattributes chore: Do not hide stage0/src/stdlib_flags.h from diffs 2023-09-13 19:29:25 +02:00
.gitignore chore: update tests to account for .lake 2023-11-13 20:31:24 -05:00
.ignore chore: ignore stage0/ (for rg etc.) 2022-03-18 15:28:20 +01:00
CMakeLists.txt feat: embed and check githash in .olean (#2766) 2023-11-27 10:24:43 +00:00
CODEOWNERS feat: snapshot trees and language processors (#3014) 2024-03-14 13:40:08 +00:00
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: replace shell.nix with a devShell in flake.nix (#3717) 2024-03-21 13:24:01 +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: remove nightly and other outdated references (#3027) 2024-01-25 13:53:36 +00:00
RELEASES.md feat: add option tactic.customEliminators to be able to turn off custom eliminators for induction and cases (#3655) 2024-03-28 01:14:17 +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.