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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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Kyle Miller 6cf22b32aa
feat: custom structure constructors can update binder kinds of parameters (#9480) 
This PR adds a feature where `structure` constructors can override the
inferred binder kinds of the type's parameters. In the following, the
`(p)` binder on `toLp` causes `p` to be an explicit parameter to
`WithLp.toLp`:
```lean
structure WithLp (p : Nat) (V : Type) where toLp (p) ::
  ofLp : V
```
This reflects the syntax of the feature added in #7742 for overriding
binder kinds of structure projections. Similarly, only those parameters
in the header of the `structure` may be updated; it is an error to try
to update binder kinds of parameters included via `variable`.

Closes #9072.

Fixes a possible bug from stale caches when creating the type of the
constructor.
2025-07-23 16:33:34 +00:00
.github chore: CI: cached Lake as secondary job (#9486) 2025-07-23 13:26:35 +00:00
doc chore: Grove: bump version (#9419) 2025-07-17 15:02:17 +00:00
images
nix chore: fix Nix build 2025-04-21 18:40:11 +02:00
releases_drafts chore: updates to release_checklist.md (#7817) 2025-04-04 03:45:36 +00:00
script chore: benchmark using USE_LAKE (#9361) 2025-07-17 18:44:29 +00:00
src feat: custom structure constructors can update binder kinds of parameters (#9480) 2025-07-23 16:33:34 +00:00
stage0 chore: update stage0 2025-07-23 16:53:11 +00:00
tests feat: custom structure constructors can update binder kinds of parameters (#9480) 2025-07-23 16:33:34 +00:00
.gitattributes
.gitignore feat: further release automation (#9092) 2025-06-30 05:44:10 +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: compile stage 0 against correct version string (#9085) 2025-06-29 20:52:46 +00:00
CMakePresets.json chore: fix reldebug preset (#8051) 2025-04-23 10:05:11 +00:00
CODEOWNERS chore: Update CODEOWNERS (#9232) 2025-07-07 13:11:41 +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: robustify Nix shell (#8141) 2025-04-28 15:08:32 +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
LICENSES feat: ship cadical (#4325) 2024-08-23 09:13:27 +00:00
README.md chore: remove old documentation site (#7974) 2025-05-14 14:31:33 +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.

About

Installation

See Setting Up Lean.

Contributing

Please read our Contribution Guidelines first.

Building from Source

See Building Lean.