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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 dede354e77
fix: Float RecApp out of applications (#2818) 
This didn't work before
```
def f (n : Nat) : Nat :=
  match n with
  | 0 => 0
  | n + 1 => (f) n
```
because the `RecApp` metadata marker gets in the way. More practically
relevant, such code is to be produced when using `rw` or `simp` in
recursive theorems (see included test case).

We can fix this by preprocessing the definitions and floating the
`.mdata` marker out of applications.

For structural recursion, there already exists a `preprocess` function;
this now also floats out `.mdata` markers.

For well-founded recursion, this introduces an analogous `preprocess`
function.

Fixes #2810.

One test case output changes: With the `.mdata` out of the way, we get a
different error message. Seems fine.

Alternative approaches are:

* Leaving the `.mdata` marker where it is, and looking around it.
  Tried in #2813, but not nice (many many places where `withApp` etc.
  need to be adjusted).
* Moving the `.mdata` _inside_ the application, so that `withApp` still
  works. Tried in #2814. Also not nice, the invariant that the `.mdata`
  is around the `.const` is tedious to maintain.
2023-11-22 14:25:09 +00:00
.github chore: CI: pin macos-11 to work around 12.7.1 breakage (#2946) 2023-11-22 13:17:27 +00:00
.vscode doc: fix some syntax and link in the docs, and more 2021-10-10 11:36:43 +02:00
doc doc: Adjust contributor's docs to squash merging (#2927) 2023-11-21 10:13:43 +00:00
images
nix fix: If src is a dir, assume the lean file has the full path (#2465) 2023-08-28 14:45:45 +02:00
script fix: most-recently-nightly-tag does not assume a 'nightly' remote (#2947) 2023-11-22 10:56:39 +00:00
src fix: Float RecApp out of applications (#2818) 2023-11-22 14:25:09 +00:00
stage0 chore: update stage0 2023-11-21 18:59:22 +01:00
tests fix: Float RecApp out of applications (#2818) 2023-11-22 14:25:09 +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: Web Assembly Build (#2599) 2023-10-04 09:04:20 +02:00
CODEOWNERS chore: more code owners 2023-11-20 09:30:18 +01:00
CONTRIBUTING.md doc: Adjust contributor's docs to squash merging (#2927) 2023-11-21 10:13:43 +00:00
default.nix doc: setup 2021-01-03 13:21:58 +01:00
flake.lock chore: Nix bump to LLVM 15 2023-07-28 10:56:54 +02:00
flake.nix chore: Nix: use strings instead of URL literals (#2172) 2023-03-28 10:10:24 +02:00
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: Update contribution guides (#2624) 2023-10-25 13:05:55 +11:00
RELEASES.md doc: release notes for recent lake fixes 2023-11-20 15:51:31 +00:00
shell.nix chore: Nix bump to LLVM 15 2023-07-28 10:56:54 +02:00

README.md

This is the repository for Lean 4.

We provide nightly releases and have just begun regular stable point releases.

About

Installation

See Setting Up Lean.

Contributing

Please read our Contribution Guidelines first.

Building from Source

See Building Lean.