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Wojciech Różowski 54f188160c fix: cbv handling of ite/dite/decide (#12816) 
This PR solves three distinct issues with the handling of
`ite`/`dite`,`decide`.

1) We prevent the simprocs from picking up `noncomputable`, `Classical`
instances, such as `Classical.propDecidable`, when simplifying the
proposition in `ite`/`dite`/`decide`.

2) We fix a type mismatch occurring when the condition/proposition is
unchanged but the `Decidable` instance is simplified.

3) If we rewrite the proposition from `c` to `c'` and the evaluation of
the original instance `Decidable c` gets stuck we try fallback path of
of obtaining `Decidable c'` instance and evaluating it. This matters
when the instance is evaluated via `cbv_eval` lemmas.

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
2026-03-06 16:18:39 +00:00
.claude
chore: improve CI failure reporting in release checklist (#12786)
2026-03-04 11:55:34 +00:00
.github
feat: move instance-class check to declaration site (#12325)
2026-03-06 03:23:27 +00:00
.vscode
chore: replace workspace file with .vscode/ settings (#12770)
2026-03-04 01:10:04 +00:00
doc
chore: replace workspace file with .vscode/ settings (#12770)
2026-03-04 01:10:04 +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
releases_drafts
chore: remove stale release draft notes (#12518)
2026-02-17 19:56:23 +00:00
script
feat: unify name demangling with single Lean implementation (#12539)
2026-03-06 12:29:35 +00:00
src
fix: cbv handling of ite/dite/decide (#12816)
2026-03-06 16:18:39 +00:00
stage0
feat: move instance-class check to declaration site (#12325)
2026-03-06 03:23:27 +00:00
tests
fix: cbv handling of ite/dite/decide (#12816)
2026-03-06 16:18:39 +00:00
.gitattributes
doc: grove: update and add String data (#11551)
2025-12-08 16:49:37 +00:00
.gitignore
chore: replace workspace file with .vscode/ settings (#12770)
2026-03-04 01:10:04 +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
chore: ignore stage0/ (for rg etc.)
2022-03-18 15:28:20 +01:00
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
LICENSE
chore: remove LICENSE header that confused GitHub
2021-11-18 09:42:35 +01:00
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.

About

Installation

See Install Lean.

Contributing

Please read our Contribution Guidelines first.

Building from Source

See Building Lean.

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