nightly-2026-02-11

Changes since nightly-2026-02-10:

Full commit log

• 9da8f5d feat: lake: record cache service in outputs (#12113)
• e5f0d62 chore: update to c++20 (#12117)
• d886be1 chore: update stage0
• 5115b8f doc: add test suite documentation to .claude/CLAUDE.md (#12421)
• c5d2796 fix: avoid unaligned pointer dereference (#12318)
• c4d85b7 chore: revert reducibility change PartialOrder.rel (#12407)
• 14b595e feat: better support for eta expanded terms in grind (#12415)
• 80257a6 doc: fix typos (#12418)
• a6ba731 chore: make toBetaApp public (#12416)
• fc4f51d feat: pick up specs from the local context in mvcgen (#12395)
• 7d32030 feat: add cbv_eval attribute (#12296)
• bc30710 fix: LCNF.getImpureSignature? on imported decls (#12410)
• d29407b chore: remove outdated trust0 test (#12401)
• df26bea feat: upstream slice API improvements from human-eval-lean (#12352)
• 82d90b4 fix: force unfolding of the Decidable instace in Decidable.rec (#12399)
• 611337e doc: the different chunks of the pass manager (#12400)
• 7488201 refactor: port IR.SimpCase to LCNF (#12384)

nightly-2026-02-10

Changes since nightly-2026-02-09:

Full commit log

• 4cdc199 chore: revert reducibility change to HasSSubset for now (#12403)
• af2444a perf: always zeta reduce let expressions in cbv (#12397)
• 57c5efe fix: handling of ite/dite expressions in cbv tactic (#12361)
• 919721c feat: IO.FS.Metadata.numLinks (#12277)
• 9a15df5 fix: IO.FS.removeFile should delete read-only files on Windows (#12282)
• 4401117 chore: make simpCond public (#12391)
• 7a8e011 test: support ite splitting and lifting through ExceptT to Sym mvcgen (#12392)
• 892475d fix: LCNF casesOnCtor can only act if type correct (#12387)
• b4a254d chore: revert "chore: CI: avoid fetching full repo in PR Release (#12309)"
• 5ba467d feat: LawfulForwardPatternModel for string patterns (#12360)
• d2c738c feat: vector iterator (#12363)

nightly-2026-02-09

Changes since nightly-2026-02-08:

Full commit log

• a31e687 fix: lake: include module identifiers in trace (#12377)
• 12ad957 chore: CI: avoid fetching full repo in PR Release (#12309)
• 690648d chore: missing annotations (#12368)
• 6f4e711 feat: some unification hints (#12341)
• 23dc467 chore: do not rely on Name.lt for ordering fvars in acLt (#12306)

nightly-2026-02-08

Changes since nightly-2026-02-07:

Full commit log

• 39c26fc feat: lake: disabling the artifact cache also disables fetching (#12300)
• f2ed53a fix: expose reduceOption (#12376)
• da62a81 feat: shake: track simpset/grindset uses (#12375)
• bbf72b9 test: refine lake/tests/shake (#12374)
• ae79d14 feat: shake: track [csimp] uses (#12351)
• 2a02685 fix: make classes appear as classes rather than structures in docs (#12373)
• 4a450bf chore: update stage0
• ba9f475 perf: use Array for CNF formulas (#11832)
• 59d514d feat: more lemmas relating Bool and (d)ite (#12371)
• 99b3ba1 fix: error messages from Verso docstring parser (#12372)

nightly-2026-02-07

Changes since nightly-2026-02-05:

Full commit log

• 03dc334 fix: simp have in Sym (#12370)
• 9f2f33b perf: more brave dead variable elimination (#12365)
• f5e5914 fix: placement of saveImpure (#12366)
• 64c0555 fix: parse indented Verso docstrings specially (#12331)
• 0e19692 fix: handle Verso docstrings that don't consume all the docstring (#12362)
• 4070ee3 fix: sigmaIterator benchmark (#12364)
• 6ac96ec feat: improve simp and grind rules for PredTrans.apply (#12358)
• 61d7eb2 feat: simplify iterator step unfolding (#12234)
• 76befb8 chore: remove orphaned *.expected.out files (#12357)
• 32fb1cc refactor: port IR elim_dead_vars to LCNF (#12356)
• 85899dd chore: update stage0
• 9ba41a6 feat: unfold [reducible] class fields (part 1) (#12340)
• fae768f fix: ensure List.filterMap is always csimped (#12348)
• faa2619 feat: add isBoolTrueExpr and isBoolFalseExpr (#12355)
• 5086a82 fix: resurrect the dead Elab.resume trace message (#12353)
• fa7f510 test: document Sym-based mvcGen and tidy up benchmark project (#12350)
• 36dd57a feat: verification of character (predicate) patterns (#12349)
• 8b52933 test: copy shallow_add_sub_cancel into mvcgen benchmark for precompilation (#12347)
• 57a6d89 feat: verification of BEq String.Slice (#12346)
• d2176cb test: add tests and benchmarks for cbv tactic (#12345)
• 8d29c59 refactor: behavior of inline annotations in the compiler (#12344)
• 9b7a8eb perf: improve over-applied cases in ToLCNF (#12284)
• 71e340e feat: allow Verso syntax for module docs to be controlled separately (#12329)
• f4c5f8e fix: set data? field in eager code actions (#12332)
• 6cf632b chore: update stage0
• dadc91d feat: backward.isDefEq.respectTransparency (part 1) (#12338)
• 8e56555 perf: put the compiler off the critical path (#12335)
• 52bc216 feat: basic infrastructure for verification of string patterns (#12333)
• c3779bc refactor: reset reuse pass to LCNF (#12315)
• 5345db8 feat: make Theorem an Inhabited instance (#12324)
• 4046dd1 fix: docstring code suggestions take shadowing into account (#12321)
• 398c362 doc: improve comments around asyncMayModify (#12270)
• 2a1ba94 chore: ready shake for use on core (#12326)
• abcb57d fix: use mathlib-lean-pr-testing app for PR comments (#12323)
• f82c408 feat: String.Slice.Subslice (#12322)
• b4d4e37 chore: shake core (#12276)
• 96ef091 chore: delete dead C++ code (#12248)
• 54cba90 refactor: derive string searcher from string pattern (#12312)

nightly-2026-02-05

Changes since nightly-2026-02-04:

Full commit log

• 75d7f7e feat: add Nat.ext_div_mod and Int.ext_ediv_emod (#12258)
• 5eeea8c fix: use GitHub App for Batteries/Mathlib checkout in PR release (#12320)
• 1695b94 feat: do not simp instances (#12244)
• 7c350e3 feat: improve instantiateExtTheorem in grind (#12319)
• 0a43167 feat: implements maxSuggestions for grind and simp
• b1b8e95 chore: update stage0
• d49e5d8 Revert "chore: temporarily disable proofs for bootstrap"
• 2f2a004 chore: update stage0
• 8ca8138 feat: add maxSuggestions field to Simp.Config and Grind.Config
• 9203df2 chore: update stage0
• 7b12b50 chore: temporarily disable proofs for bootstrap
• 15e4af8 chore: add explicit type for robustness under bootstrapping
• b397d46 fix: report Verso docsring parse errors (#12314)
• ff93bb6 feat: add cbv_opaque attribute (#12283)
• e08cb95 chore: fail benchmarks if lakeprof upload fails (#12313)
• bd8c861 test: add program evaluation benchmark to cbv (#12280)
• e932871 doc: review and add docstrings for syntax operators in manual and one range statement (#12271)
• 47a18a4 feat: add experimental cbv tactic (#12279)
• 635d5c1 fix: enable custom CCPO when using module system (#12311)
• 35852a9 chore: lemmas for basic types (#12305)
• 1ed3ce2 chore: remove unused Lean.Data.Xml (#12302)
• 8a9cb6d feat: Slice.posGE and Slice.posGT (#12301)

nightly-2026-02-04

Changes since nightly-2026-02-03:

Full commit log

• 5ec3b8c chore: update stage0
• 34620ec perf: speedup some fvar handling in LCNF (#12298)
• 7ba76bd refactor: port push_proj to LCNF (#12294)
• 00c1f0d test: create aux theorems for backward rules in SymM-based mvcgen (#12295)
• d1671aa fix: make PredTrans.apply semi-reducible (#12290)
• 3516b66 chore: two typos in the impure refactoring (#12288)
• a0cec18 chore: move test suite setup to tests/CMakeLists.txt (#12278)
• c09700d fix: [local simp] on privately imported theorem (#12287)
• b0ef99f chore: CI: bump actions/cache from 4 to 5 (#11862)
• 1fe7e50 chore: CI: bump actions/download-artifact from 6 to 7 (#11863)
• 70f4530 chore: update stage0
• 26f6bc6 feat: lambda pure conversion in LCNF (#12272)
• 2907df2 feat: one axiom per native computation (#12217)

nightly-2026-02-03

Changes since nightly-2026-02-02:

Full commit log

• e02a140 feat: @[instance_reducible] part 2 (#12263)
• 3deba60 feat: cache output universe parameter positions (#12285)
• 3ad3bac chore: update stage0
• c27ea08 fix: set isRecursive only after adding the declaration (#12269)
• 5d41b3b fix: avoid deadlock by not throttling workers when the task manager is shutting down (#12052)
• 240c64b chore: update stage0
• a966a19 fix: unification issue in proofs generated by Lean.Meta.MkIffOfInductiveProp (#12219)
• 3c64f6a feat: lemmas about sums of lists/arrays/vectors (#11994)

nightly-2026-02-02

Changes since nightly-2026-02-01:

Full commit log

• c7a9a4e chore: update stage0
• a7b9a3d refactor: move getOriginalConstKind? into its own module to avoid future import cycle (#12265)
• c25468f feat: various small list/array/vector API improvements (#12017)
• a362093 chore: update grind IndexMap example (#12264)

nightly-2026-02-01

Changes since nightly-2026-01-31:

Full commit log

• ec60620 chore: update stage0
• 4606c35 feat: @[instance_reducible] (#12247)
• 9f4c813 chore: cleanup test (#12262)
• 89c01c9 fix: lake: facet names in unknown facet errors (#12261)
• ce98089 fix: IO.Process.spawn empty env var on Windows (#12220)
• 6c5de54 feat: add orElse combinator to Sym.Simp.Simproc (#12236)
• 21a281b fix: bug in instantiateRangeS' (#12260)
• 7cd6b78 feat: Std.Iter.isEmpty (#12212)
• b64e5de feat: projected minima and maxima (#11938)