This dashboard answers these questions about projects that depend on mathlib4:
- How far behind is the dependency revision? A scheduled workflow builds each registered downstream against the most recent mathlib commit (the target). The age column shows how many commits your pinned revision lags behind it.
- Which commit introduced the incompatibility? When the downstream is incompatible with the target, we run hopscotch to scan the mathlib history between the pinned revision and the target, to identify the first known bad commit — the earliest Mathlib revision incompatible with the downstream — and the last known good commit just before it.
- How much can I safely advance the dependency? The last known good commit is a safe upgrade target. The bump column shows the distance between it and the currently pinned revision.
Glossary
| Downstream | Pinned to | Age | Target | Compatibility | Last known good | First known bad | Bump | Last good release | Links |
|---|---|---|---|---|---|---|---|---|---|
| e9626a5 | 0d (+24) | 726a7f1 | compatible checked 2026-10-01 | 726a7f1 | — | +24 | v4.35.0-rc3 (-145) | ||
add-combi builds successfully against Mathlib 726a7f1. Its pin can be safely advanced by 24 commits to the last known good revision 726a7f1. Last checked2026-10-01 17:04 UTC ()Validation took1m 36sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
| ec6a61c | 3d (+130) | 726a7f1 | compatible checked 2026-10-01 | 726a7f1 | — | +130 | v4.35.0-rc3 (-39) | ||
| ec6a61c | 3d (+130) | 726a7f1 | compatible checked 2026-10-01 | 726a7f1 | — | +130 | v4.35.0-rc3 (-39) | ||
BrauerGroup builds successfully against Mathlib 726a7f1. Its pin can be safely advanced by 130 commits to the last known good revision 726a7f1. Last checked2026-10-01 17:04 UTC ()Validation took3m 31sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
| ec6a61c | 3d (+130) | 726a7f1 | compatible checked 2026-10-01 | 726a7f1 | — | +130 | v4.35.0-rc3 (-39) | ||
cam-combi builds successfully against Mathlib 726a7f1. Its pin can be safely advanced by 130 commits to the last known good revision 726a7f1. Last checked2026-10-01 17:04 UTC ()Validation took1m 42sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
| b63493a | 23d (+650) | v4.34.0 | incompatible checked 2026-10-01 | f1c1e67 | ce084cc | +39 | v4.34.0-rc2 (-25) | ||
carleson fails to build against Mathlib v4.34.0. The incompatibility was introduced by Mathlib commit ce084cc (“feat(Topology/MetricSpace): add distance congruence lemmas (#42893)”). The commit immediately before it, f1c1e67, still works and is a safe upgrade target. Mathlib commit window (older → newer) Last checked2026-10-01 17:04 UTC ()Validation took3m 39sHow it was checkedDirect build of the target revision; it matches a previously identified incompatibility, so the known good/bad boundary from the earlier bisect is shownFailed during lake build | |||||||||
| v4.35.0-rc3 | 6d (+169) | 726a7f1 | compatible checked 2026-10-01 | 726a7f1 | — | +169 | v4.35.0-rc3 | ||
chandra-furst-lipton builds successfully against Mathlib 726a7f1. Its pin can be safely advanced by 169 commits to the last known good revision 726a7f1. Mathlib commit window (older → newer) Last checked2026-10-01 17:04 UTC ()Validation took1m 36sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
| 26245e6 | 9d (+135) | v4.33.0-rc2 | compatible checked 2026-10-01 | v4.33.0-rc2 | — | +135 | v4.33.0-rc2 (+135) | ||
ClassFieldTheory builds successfully against Mathlib v4.33.0-rc2. Its pin can be safely advanced by 135 commits to the last known good revision v4.33.0-rc2. Mathlib commit window (older → newer) Last checked2026-10-01 17:04 UTC ()Validation took17sHow it was checkedSkipped — this exact project revision was already validated as compatible with this Mathlib revision in a previous run | |||||||||
| v4.34.0 | 9d (+1) | v4.34.1 | compatible checked 2026-10-01 | v4.34.1 | — | +1 | v4.34.1 (+1) | ||
compfiles builds successfully against Mathlib v4.34.1. Its pin can be safely advanced by 1 commit to the last known good revision v4.34.1. Last checked2026-10-01 17:04 UTC ()Validation took17sHow it was checkedSkipped — this exact project revision was already validated as compatible with this Mathlib revision in a previous run | |||||||||
| a9fe973 | 2d (+114) | 726a7f1 | incompatible checked 2026-10-01 | 380f2aa | 728a93e | +78 | v4.35.0-rc3 (-55) | ||
cslib fails to build against Mathlib 726a7f1. The incompatibility was introduced by Mathlib commit 728a93e (“chore(Basic): move `FunLike` from Data (#43253)”). The commit immediately before it, 380f2aa, still works and is a safe upgrade target. Mathlib commit window (older → newer) Last checked2026-10-01 17:04 UTC ()Validation took8m 23sHow it was checkedFull bisect — the Mathlib commit window was searched in this run to pinpoint the exact breaking commitFailed during lake build | |||||||||
| v4.35.0-rc1 | 0d (+21) | v4.35.0-rc2 | compatible checked 2026-10-01 | v4.35.0-rc2 | — | +21 | v4.35.0-rc2 (+21) | ||
DirichletProblem builds successfully against Mathlib v4.35.0-rc2. Its pin can be safely advanced by 21 commits to the last known good revision v4.35.0-rc2. Mathlib commit window (older → newer) Last checked2026-10-01 17:04 UTC ()Validation took17sHow it was checkedSkipped — this exact project revision was already validated as compatible with this Mathlib revision in a previous run | |||||||||
| v4.35.0-rc2 | 8d (+142) | v4.35.0-rc3 | compatible checked 2026-10-01 | v4.35.0-rc3 | — | +142 | v4.35.0-rc3 (+142) | ||
DynamicalSystems builds successfully against Mathlib v4.35.0-rc3. Its pin can be safely advanced by 142 commits to the last known good revision v4.35.0-rc3. Mathlib commit window (older → newer) Last checked2026-10-01 17:04 UTC ()Validation took17sHow it was checkedSkipped — this exact project revision was already validated as compatible with this Mathlib revision in a previous run | |||||||||
detached | 64d (+1881) | 726a7f1 | incompatible checked 2026-10-01 | — | 39c86ed | — | — | ||
ErdosUnitDistance fails to build against Mathlib 726a7f1. The earliest known incompatible Mathlib commit is 39c86ed (“feat(NumberTheory/NumberField/AdeleRing): define the idele class group (#40735)”). Last checked2026-10-01 17:04 UTC ()Validation took6m 13sHow it was checkedDirect build of the target revision; it matches a previously identified incompatibility, so the known good/bad boundary from the earlier bisect is shownFailed during lake build⚠ The pinned revision is not an ancestor of the target, so no commit window could be searched — only the target itself was validated. | |||||||||
| master-2026-09-27 | 4d (+133) | 726a7f1 | incompatible checked 2026-10-01 | b63f6e8 | ec6a61c | +2 | v4.35.0-rc3 (-36) | ||
FLT fails to build against Mathlib 726a7f1. The incompatibility was introduced by Mathlib commit ec6a61c (“chore: demote public imports that need no downstream imports (#43918)”). The commit immediately before it, b63f6e8, still works and is a safe upgrade target. Mathlib commit window (older → newer) master-2026-09-27pinned 2 commits b63f6e8last known good ec6a61cfirst known bad 130 commits 726a7f1target Last checked2026-10-01 17:04 UTC ()Validation took12m 15sHow it was checkedFull bisect — the Mathlib commit window was searched in this run to pinpoint the exact breaking commitFailed during lake build | |||||||||
| a8db657 | 3d (+72) | v4.35.0-rc3 | compatible checked 2026-10-01 | v4.35.0-rc3 | — | +72 | v4.35.0-rc3 (+72) | ||
flt-regular builds successfully against Mathlib v4.35.0-rc3. Its pin can be safely advanced by 72 commits to the last known good revision v4.35.0-rc3. Mathlib commit window (older → newer) Last checked2026-10-01 17:04 UTC ()Validation took16sHow it was checkedSkipped — this exact project revision was already validated as compatible with this Mathlib revision in a previous run | |||||||||
| v4.35.0-rc3 | 6d (+169) | 726a7f1 | compatible checked 2026-10-01 | 726a7f1 | — | +169 | v4.35.0-rc3 | ||
forbidden-matrix builds successfully against Mathlib 726a7f1. Its pin can be safely advanced by 169 commits to the last known good revision 726a7f1. Mathlib commit window (older → newer) Last checked2026-10-01 17:04 UTC ()Validation took1m 53sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
| v4.35.0-rc3 | 6d (+169) | 726a7f1 | compatible checked 2026-10-01 | 726a7f1 | — | +169 | v4.35.0-rc3 | ||
gibbs-measure builds successfully against Mathlib 726a7f1. Its pin can be safely advanced by 169 commits to the last known good revision 726a7f1. Mathlib commit window (older → newer) Last checked2026-10-01 17:04 UTC ()Validation took5m 23sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
| d870b90 | 5d (+153) | 726a7f1 | error checked 2026-10-01 | — | c35749f | — | — | ||
The latest validation run for hex-dev hit an unexpected error before producing a result. This usually points to an infrastructure problem (runner, network, cache) rather than a Mathlib incompatibility. Last checked2026-10-01 17:04 UTC ()Validation took19m 01sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible)Failed during lake updatelake update failed; dependency resolution is a network operation, so no tested commit is implicated | |||||||||
| v4.33.0 | 11d (+1) | v4.33.1 | compatible checked 2026-10-01 | v4.33.1 | — | +1 | v4.33.1 (+1) | ||
HighlyAbundant builds successfully against Mathlib v4.33.1. Its pin can be safely advanced by 1 commit to the last known good revision v4.33.1. Last checked2026-10-01 17:04 UTC ()Validation took18sHow it was checkedSkipped — this exact project revision was already validated as compatible with this Mathlib revision in a previous run | |||||||||
| 1fe0a51 | 2d (+33) | v4.34.0-rc2 | compatible checked 2026-10-01 | v4.34.0-rc2 | — | +33 | v4.34.0-rc2 (+33) | ||
infinity-cosmos builds successfully against Mathlib v4.34.0-rc2. Its pin can be safely advanced by 33 commits to the last known good revision v4.34.0-rc2. Mathlib commit window (older → newer) Last checked2026-10-01 17:04 UTC ()Validation took18sHow it was checkedSkipped — this exact project revision was already validated as compatible with this Mathlib revision in a previous run | |||||||||
| 4871404 | 0d (+6) | v4.35.0-rc3 | compatible checked 2026-10-01 | v4.35.0-rc3 | — | +6 | v4.35.0-rc3 (+6) | ||
LeanMachineLearning builds successfully against Mathlib v4.35.0-rc3. Its pin can be safely advanced by 6 commits to the last known good revision v4.35.0-rc3. Mathlib commit window (older → newer) Last checked2026-10-01 17:04 UTC ()Validation took18sHow it was checkedSkipped — this exact project revision was already validated as compatible with this Mathlib revision in a previous run | |||||||||
| 5e04369 | 1d (+73) | 726a7f1 | compatible checked 2026-10-01 | 726a7f1 | — | +73 | v4.35.0-rc3 (-96) | ||
mean-fourier builds successfully against Mathlib 726a7f1. Its pin can be safely advanced by 73 commits to the last known good revision 726a7f1. Last checked2026-10-01 17:04 UTC ()Validation took1m 53sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
| v4.35.0-rc3 | 6d (+169) | 726a7f1 | compatible checked 2026-10-01 | 726a7f1 | — | +169 | v4.35.0-rc3 | ||
misc-yd builds successfully against Mathlib 726a7f1. Its pin can be safely advanced by 169 commits to the last known good revision 726a7f1. Mathlib commit window (older → newer) Last checked2026-10-01 17:04 UTC ()Validation took1m 50sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
| v4.35.0-rc3 | 6d (+169) | 726a7f1 | compatible checked 2026-10-01 | 726a7f1 | — | +169 | v4.35.0-rc3 | ||
PersistentDecomp builds successfully against Mathlib 726a7f1. Its pin can be safely advanced by 169 commits to the last known good revision 726a7f1. Mathlib commit window (older → newer) Last checked2026-10-01 17:04 UTC ()Validation took1m 43sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
| e9626a5 | 0d (+24) | 726a7f1 | compatible checked 2026-10-01 | 726a7f1 | — | +24 | v4.35.0-rc3 (-145) | ||
| b8dad03 | 5d (+198) | v4.28.0 | compatible checked 2026-10-01 | v4.28.0 | — | +198 | v4.28.0 (+198) | ||
Poly builds successfully against Mathlib v4.28.0. Its pin can be safely advanced by 198 commits to the last known good revision v4.28.0. Last checked2026-10-01 17:04 UTC ()Validation took18sHow it was checkedSkipped — this exact project revision was already validated as compatible with this Mathlib revision in a previous run | |||||||||
| v4.33.0 | 11d (+1) | v4.33.1 | compatible checked 2026-10-01 | v4.33.1 | — | +1 | v4.33.1 (+1) | ||
PrimeCert builds successfully against Mathlib v4.33.1. Its pin can be safely advanced by 1 commit to the last known good revision v4.33.1. Last checked2026-10-01 17:04 UTC ()Validation took22sHow it was checkedSkipped — this exact project revision was already validated as compatible with this Mathlib revision in a previous run | |||||||||
| v4.34.0 | 9d (+1) | v4.34.1 | compatible checked 2026-10-01 | v4.34.1 | — | +1 | v4.34.1 (+1) | ||
PrimeNumberTheoremAnd builds successfully against Mathlib v4.34.1. Its pin can be safely advanced by 1 commit to the last known good revision v4.34.1. Last checked2026-10-01 17:04 UTC ()Validation took5m 21sHow it was checkedDirect build of the target revision only (no commit-window search was needed or possible) | |||||||||
| v4.31.0 | 3d (+113) | v4.32.0-rc1 | compatible checked 2026-10-01 | v4.32.0-rc1 | — | +113 | v4.32.0-rc1 (+113) | ||
Robo builds successfully against Mathlib v4.32.0-rc1. Its pin can be safely advanced by 113 commits to the last known good revision v4.32.0-rc1. Mathlib commit window (older → newer) Last checked2026-10-01 17:04 UTC ()Validation took21sHow it was checkedSkipped — this exact project revision was already validated as compatible with this Mathlib revision in a previous run | |||||||||
| v4.34.0-rc2 | 24d (+675) | v4.34.0 | incompatible checked 2026-10-01 | 5ce203e | 44573ce | +130 | v4.34.0-rc2 | ||
Sphere-Packing-Lean fails to build against Mathlib v4.34.0. The incompatibility was introduced by Mathlib commit 44573ce (“chore: create a `Basic` top folder (#39703)”). The commit immediately before it, 5ce203e, still works and is a safe upgrade target. Mathlib commit window (older → newer) Last checked2026-10-01 17:04 UTC ()Validation took4m 25sHow it was checkedDirect build of the target revision; it matches a previously identified incompatibility, so the known good/bad boundary from the earlier bisect is shownFailed during lake build | |||||||||
| v4.33.0 | 11d (+1) | v4.33.1 | compatible checked 2026-10-01 | v4.33.1 | — | +1 | v4.33.1 (+1) | ||
| v4.31.0-rc1 | 10d (+329) | v4.31.0-rc2 | incompatible checked 2026-10-01 | 01cc327 | 89ce8bf | +259 | v4.31.0-rc1 | ||
sum_product fails to build against Mathlib v4.31.0-rc2. The incompatibility was introduced by Mathlib commit 89ce8bf (“feat(Tactic): `convert` discharges side goals reducibly (#39928)”). The commit immediately before it, 01cc327, still works and is a safe upgrade target. Mathlib commit window (older → newer) Last checked2026-10-01 17:04 UTC ()Validation took6m 54sHow it was checkedDirect build of the target revision; it matches a previously identified incompatibility, so the known good/bad boundary from the earlier bisect is shownFailed during lake build | |||||||||
| 516d312 | 4d (+134) | 726a7f1 | incompatible checked 2026-10-01 | c3f56bb | b63f6e8 | +2 | v4.35.0-rc3 (-35) | ||
TauCeti fails to build against Mathlib 726a7f1. The incompatibility was introduced by Mathlib commit b63f6e8 (“chore(Analysis/Calculus): rename ApproximatesLinearOn.(anti)lipschitz (#44231)”). The commit immediately before it, c3f56bb, still works and is a safe upgrade target. Mathlib commit window (older → newer) Last checked2026-10-01 17:04 UTC ()Validation took1h 21mHow it was checkedboundary-revalidatedFailed during lake build | |||||||||
| e9626a5 | 1d (+26) | a04f5a6 | compatible checked 2026-10-01 | a04f5a6 | — | +26 | v4.35.0-rc3 (-145) | ||
| No downstream matches the current filters. | |||||||||