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kim/deriving-prop-noncomputable
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Kim Morrison b613add013 fix: deriving instance should not require noncomputable for Prop-valued classes 
The noncomputable pre-check in `processDefDeriving` (added in #12756) scans
the instance value for noncomputable constants and rejects with an error. But
when the instance type is `Prop`, proofs are erased by the compiler, so
computability is irrelevant. Skip the check when `isProp result.type`.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-03-04 13:17:22 +00:00
.claude
chore: improve CI failure reporting in release checklist (#12786)
2026-03-04 11:55:34 +00:00
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fix: use pull_request_target for label-triggered workflows (#12638)
2026-03-01 19:20:56 +11:00
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2026-03-04 01:10:04 +00:00
doc
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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
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chore: remove stale release draft notes (#12518)
2026-02-17 19:56:23 +00:00
script
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2026-03-04 11:55:34 +00:00
src
fix: deriving instance should not require noncomputable for Prop-valued classes
2026-03-04 13:17:22 +00:00
stage0
chore: update stage0
2026-03-02 22:42:13 +00:00
tests
fix: deriving instance should not require noncomputable for Prop-valued classes
2026-03-04 13:17:22 +00:00
.gitattributes
doc: grove: update and add String data (#11551)
2025-12-08 16:49:37 +00:00
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.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)
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lean-toolchain
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2026-02-25 10:23:35 +00:00
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2021-11-18 09:42:35 +01:00
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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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