Bump to Lean 4.31.0, following Strata - #23
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Strata moved to Lean 4.31 on 2026-09-26. Pins, all upstream: - Strata: a4e49006 (main, 4.31) - lean-smt: 9aedcbf (its 4.31 commit) - mathlib: no longer pinned here. The explicit pin existed only because lean-smt asked for a mathlib tag that did not match our toolchain; at 9aedcbf it asks for v4.31.0 itself. mutual_recursion.lean: the proof over the `MyNat` datatype now pins its error instead of passing. Strata's gen_vcs now also generates the selector well-formedness obligations (strata-org/Strata#1471), and turning those into Lean goals needs datatype support in the VC-to-Lean translation, which is strata-org/Strata#1480, not yet merged. The test records the gap until then. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Oct 5, 2026
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Strata moved to Lean 4.31 on 2026-09-26. This follows it.
Pins
All upstream, no forks:
62d26d94a4e49006(main)7d1d8239aedcbf(its 4.31 commit)v4.29.1, pinned hereThe explicit mathlib pin existed only because lean-smt asked for a mathlib tag that did not match our toolchain. At
9aedcbfit asks forv4.31.0itself.One test now records a gap
In
mutual_recursion.lean, the Lean proof over theMyNatdatatype now pins its error instead of passing. Strata'sgen_vcsnow also generates the selector well-formedness obligations (strata-org/Strata#1471), and turning those into Lean goals needs datatype support in the VC-to-Lean translation, which is strata-org/Strata#1480. The test records the gap until that merges.Testing
lake build StrataBooleTest(280 jobs) andlake testpass.By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.