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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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Copilot 73640d3758
fix: preserve @[implicit_reducible] for WF-recursive definitions (#12776) 
This PR fixes `@[implicit_reducible]` on well-founded recursive
definitions.

`addPreDefAttributes` sets WF-recursive definitions as `@[irreducible]`
by default, skipping this only when the user explicitly wrote
`@[reducible]` or `@[semireducible]`. It was missing
`@[instance_reducible]` and `@[implicit_reducible]`, causing those
attributes to be silently overridden.

Add `instance_reducible` and `implicit_reducible` to the check in
`src/Lean/Elab/PreDefinition/Mutual.lean` that guards against overriding
user-specified reducibility attributes, and add regression tests in
`tests/elab/wfirred.lean`.

## Example

```lean
-- Before fix: printed @[irreducible] def f : List Nat → Nat
-- After fix:  printed @[implicit_reducible] def f : List Nat → Nat
@[instance_reducible] def f : ∀ _l : List Nat, Nat
  | [] => 0
  | [_x] => 1
  | x :: y :: l => if h : x = y then f (x :: l) else f l + 2
termination_by l => sizeOf l

#print sig f
```

Fixes #12775

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: nomeata <148037+nomeata@users.noreply.github.com>
2026-03-03 18:57:55 +00:00
.claude doc: add guidance on waiting for CI/merges in release command (#12755) 2026-03-02 02:49:34 +00:00
.github fix: use pull_request_target for label-triggered workflows (#12638) 2026-03-01 19:20:56 +11:00
doc chore: switch to new test/bench suite (#12590) 2026-02-25 13:51:53 +00:00
images
releases_drafts chore: remove stale release draft notes (#12518) 2026-02-17 19:56:23 +00:00
script chore: fix profiler shebang and add profiling skill (#12519) 2026-03-01 07:09:33 +00:00
src fix: preserve @[implicit_reducible] for WF-recursive definitions (#12776) 2026-03-03 18:57:55 +00:00
stage0 chore: update stage0 2026-03-02 22:42:13 +00:00
tests fix: preserve @[implicit_reducible] for WF-recursive definitions (#12776) 2026-03-03 18:57:55 +00:00
.gitattributes doc: grove: update and add String data (#11551) 2025-12-08 16:49:37 +00:00
.gitignore chore: fix ci for new test suite (#12704) 2026-02-27 23:25:37 +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: fail build on non-make generators (#12690) 2026-02-25 13:59:40 +00:00
CMakePresets.json chore: fix ci for new test suite (#12704) 2026-02-27 23:25:37 +00:00
CODEOWNERS chore: make @hargoniX code owner of the compiler (#10732) 2025-10-10 04:43:38 +00:00
CONTRIBUTING.md doc: triage 2024-07-26 18:24:06 +02:00
flake.lock chore: update to c++20 (#12117) 2026-02-11 01:17:40 +00:00
flake.nix chore: update to c++20 (#12117) 2026-02-11 01:17:40 +00:00
lean-toolchain chore: relative lean-toolchains (#12652) 2026-02-25 10:23:35 +00:00
lean.code-workspace chore: relative lean-toolchains (#12652) 2026-02-25 10:23:35 +00:00
LICENSE
LICENSES feat: ship cadical (#4325) 2024-08-23 09:13:27 +00:00
README.md doc: update URLs that are currently pointing to redirects (#10397) 2025-09-17 15:50:07 +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.

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Contributing

Please read our Contribution Guidelines first.

Building from Source

See Building Lean.