lean: ship the module roots — lean cannot compile anything without them - #605
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…them
The `lean` package is currently non-functional. Not "degraded on some inputs":
it cannot compile `#eval 1+1`.
$ lean /tmp/t.lean
error: object file '/usr/lib/lean/Init.olean' of module Init does not exist
Lean's module ROOTS (`Init.olean`, `Std.olean`, `Lean.olean`, `Lake.olean`) sit
directly in `lib/lean/`, not inside a subdirectory. Two independent places drop
them:
* build.sh copies `lib/lean/*.a` and `lib/lean/*.so*`, then loops over
`lib/lean/*/` — DIRECTORIES ONLY. The root-level `.olean` files are never
copied into $OUTPUT_DIR at all.
* the output glob `usr/lib/lean/**/*.olean` requires at least one directory
level, so it would not capture them even if they were there.
Both are fixed; either alone is a no-op. I wrote the glob fix first and it
would have shipped as a change that did nothing.
Why it hid: everything else looked right. 586 oleans land under Init/ and Std/,
the binaries run, `lean --version` answers, and `mip check` passes. The only
absent class is the one file per module that makes all the rest reachable.
Found while building an aeneas verification bench: charon and aeneas both work
end to end (a Rust crate -> `.llbc` -> a Lean model that correctly types `u32`
addition as `Result Std.U32`), and then nothing could CHECK the model. The
`aeneas` stack's comment says the loop "actually closes (emit AND check)" — it
does not, today.
NOT locally build-verified: `mip package build` refuses on macOS ("sandbox
execution is only supported on Linux"), so this leans on CI to build it. The
check to make against a built tree is `ls usr/lib/lean/Init.olean` and a
`lean /tmp/t.lean` that no longer errors.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe Lean package now captures and copies root-level ChangesLean root module packaging
Estimated code review effort: 2 (Simple) | ~10 minutes Mergeability Score: 🟡 Moderate · up to The package build can still publish an incomplete Lean library if a required module root is missing, because copy failures are suppressed. Merge should wait for strict validation of the required roots or explicit owner acceptance of this bounded correctness risk. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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Inline comments:
In `@packages/lean/build.sh`:
- Line 49: Update the root module copy step in the build script to first
validate that Init.olean, Std.olean, Lean.olean, and Lake.olean exist in the
staging library directory, then remove the suppressed cp failure handling so any
required artifact or copy failure terminates the build.
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packages/lean/build.nclpackages/lean/build.sh
…tly (CR) CodeRabbit's point, and it is the right one: the copy `|| true`s its errors and a glob still matches whatever IS present, so one absent root would publish an incomplete Lean library again — with a green build, exactly as this package has been doing for however long it has been broken. So assert the four roots after copying. A layout change upstream now fails the build with a message naming the missing module, instead of shipping a lean that compiles nothing and waiting for someone to try to use it. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
The
leanpackage is currently non-functional. Not "degraded on some inputs" — it cannot compile#eval 1+1:Cause
Lean's module roots —
Init.olean,Std.olean,Lean.olean,Lake.olean— sit directly inlib/lean/, not inside a subdirectory. Two independent places drop them:build.shcopieslib/lean/*.aandlib/lean/*.so*, then loops overlib/lean/*/— directories only. The root-level.oleanfiles never reach$OUTPUT_DIR.usr/lib/lean/**/*.oleanrequires at least one directory level, so it wouldn't capture them even if they were there.Both are fixed here. Either alone is a no-op — I wrote the glob fix first, and it would have shipped as a change that did nothing until I read
build.sh.Why it hid
Everything else looked right. 586 oleans land under
Init/andStd/, the binaries run,lean --versionanswers, andmip checkpasses. The only absent class is the one file per module that makes all the rest reachable.How it surfaced
Building an aeneas verification bench (a session loadout for the
aeneasstack). The first two steps of the documented pipeline work end to end on a trivial crate:and the model is faithful —
fn add(a: u32, b: u32) -> u32comes out asResult Std.U32, modelling the overflow rather than pretending the addition is total. Then nothing could check it.Worth noting:
stacks/aeneas/stack.nclsays Lean is there "so the loop actually closes (emit AND check)". That claim isn't true today; this PR is what makes it true.Verification status — please read
Not locally build-verified.
mip package buildrefuses on macOS (sandbox execution is only supported on Linux), so this leans on CI to do the real build.mip check --packages leanis green, but its build-dependent checks Skip on an unbuilt package, so that's weak evidence by itself.The two checks to make against a built tree:
🤖 Generated with Claude Code
Summary by CodeRabbit
Init,Std,Lean, andLake.