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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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Mario Carneiro 178ab8ef2e
fix: Option.getD eagerly evaluates dflt (#3043) 
Reported [on
Zulip](https://leanprover.zulipchat.com/#narrow/stream/348111-std4/topic/Panics.20in.20Std.2EHashMap.2Efind!/near/406872395).
The `dflt` argument of `Option.getD` is not evaluated lazily, as the
documentation says, because even after `macro_inline` the expression
```lean
match opt, dflt with
| some x, _ => x
| none, e => e
```
still has the semantics of evaluating `dflt` when `opt` is `some x`.
2023-12-11 10:07:30 +00:00
.github chore: stage0 autoupdater action (#3042) 2023-12-11 09:50:27 +00:00
doc chore: stage0 autoupdater action (#3042) 2023-12-11 09:50:27 +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: set warningAsError in CI only (#3030) 2023-12-06 08:18:39 +00:00
script chore: script/most-recent-nightly-tag uses https rather than ssh repo URL (#2951) 2023-11-23 10:27:46 +00:00
src fix: Option.getD eagerly evaluates dflt (#3043) 2023-12-11 10:07:30 +00:00
stage0 chore: update stage0 (#3041) 2023-12-08 12:14:47 +00:00
tests fix: Option.getD eagerly evaluates dflt (#3043) 2023-12-11 10:07:30 +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 doc: widget code owner 2023-12-01 15:46:45 +00:00
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
lean-toolchain doc: VS Code dev setup (#2961) 2023-11-30 08:35:03 +00:00
lean.code-workspace chore: add vscode cmake configuration (#3008) 2023-12-04 16:35:03 +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: Update contribution guides (#2624) 2023-10-25 13:05:55 +11:00
RELEASES.md feat: string gaps for continuing string literals across multiple lines (#2821) 2023-12-07 08:17:00 +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.