This PR fixes a gap in how `@[implicit_reducible]` is assigned to parent
projections during structure elaboration.
When `class C extends P₁, P₂` has diamond inheritance, some ancestor
structures become constructor subobject fields even though they aren't
direct parents. For example, in `Monoid extends Semigroup, MulOneClass`,
`One` becomes a constructor subobject of `Monoid` — its field `one`
doesn't overlap with `Semigroup`'s fields, and `inSubobject?` is `none`
during `MulOneClass` flattening.
`mkProjections` creates the projection `Monoid.toOne` but defers
reducibility to `addParentInstances` (guarded by `if !instImplicit`).
However, `addParentInstances` only processes direct parents from the
`extends` clause. Grandparent subobject projections fall through the gap
and stay `semireducible`.
This causes defeq failures when `backward.isDefEq.respectTransparency`
is enabled (#12179): at `.instances` transparency, the semireducible
grandparent projection can't unfold, so two paths to the same ancestor
structure aren't recognized as definitionally equal.
Fix: before `addParentInstances`, iterate over all `.subobject` fields
and set `implicitReducible` on those whose parent is a class.
🤖 Prepared with Claude Code
---------
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
This PR marks `levelZero` and `Level.ofNat` as `@[implicit_reducible]`
so that `Level.ofNat 0 =?= Level.zero` succeeds when the definitional
equality checker respects transparency annotations. Without this,
coercions between structures with implicit `Level` parameters fail, as
reported by @FLDutchmann on
[Zulip](https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/backward.2EisDefEq.2ErespectTransparency/near/576131374).
🤖 Prepared with Claude Code
---------
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
The linter was running in parallel with other tests, which were creating
and deleting files. Since the linter was iterating over some files and
directories at the time, it crashed.
This PR relates `String.split` to `List.splitOn` and `List.splitOnP`,
provided that we are splitting by a character or character predicate.
Also included: some more lemmas about `List.splitOn`, and a refactor of
the generic `split` verification to get rid of the awkward `SlicesFrom`
constuct.
This PR ensures the compiler extracts `Array`/`ByteArray`/`FloatArray`
literals as one big closed term to avoid quadratic overhead at closed
term initialization time.
This PR changes the spec lookup procedure in Sym-based mvcgen so that
1. Spec candidates are sorted first before being filtered
2. Instead of filtering the whole set of candidates using
`spec.pattern.match?`, we take the first match with the highest
priority.
The second point means we will do a lot fewer matches when the highest
priority spec matches immediately. In this case, the one match is still
partially redundant with the final application of the backward rule
application. It would be great if could somehow specialize the backward
rule after it has been created. Still, this yields some welcome
speedups. Before and after for each.
```
vcgen_add_sub_cancel:
goal_1000: 865 ms, 1 VCs by grind: 228 ms, kernel: 435 ms
goal_1000: 540 ms, 1 VCs by grind: 229 ms, kernel: 426 ms
vcgen_ping_pong:
goal_1000: 458 ms, 0 VCs, kernel: 431 ms
goal_1000: 454 ms, 0 VCs, kernel: 443 ms (unchanged, because there is only ever one candidate spec)
vcgen_deep_add_sub_cancel:
goal_1000: 986 ms, 1 VCs by grind: 234 ms, kernel: 735 ms
goal_1000: 728 ms, 1 VCs by grind: 231 ms, kernel: 708 ms
vcgen_reader_state:
goal_1000: 746 ms, 1 VCs by sorry: 1 ms, kernel: 803 ms
goal_1000: 525 ms, 1 VCs by sorry: 1 ms, kernel: 840 ms
```
This PR fixes a bug in `Meta.zetaReduce` where `have` expressions were
not being zeta reduced. It also adds a feature where applications of
local functions are beta reduced, and another where zeta-delta reduction
can be disabled. These are all controllable by flags:
- `zetaDelta` (default: true) enables unfolding local definitions
- `zetaHave` (default: true) enables zeta reducing `have` expressions
- `beta` (default: true) enables beta reducing applications of local
definitions
Closes#10850
This PR adds support for generating and discharging postcondition VCs in
Sym-based `mvcgen`. It also adds a new benchmark case
`vcgen_ping_pong.lean` that tests this functionality. This benchmark
required a more diligent approach to maintain maximal sharing in goal
preprocessing. Goal preprocessing was subsequently merged into the main
VC generation function.
This PR changes the order of implicit parameters `α` and `ps` such that
`α` consistently comes before `ps` in `PostCond.noThrow`,
`PostCond.mayThrow`, `PostCond.entails`, `PostCond.and`, `PostCond.imp`
and theorems.
This PR ports the simple ground expression extraction pass from IR to
LCNF.
I locally confirmed that this produces no diff between stage1/stage2 at
the C level (apart from the
changed compiler files) so this should essentially be binary equivalent.
This PR upstreams `List.splitOn` and `List.splitOnP` from
Batteries/mathlib.
The function `splitOnP.go` is factored out to `splitOnPPrepend`, because
it is useful to state induction hypotheses in terms of
`splitOnPPrepend`.
This PR ports the expand reset/reuse pass from IR to LCNF. In addition
it prevents exponential code generation unlike the old one. This results
in a ~15% decrease in binary size and slight speedups across the board.
The change also removes the "is this reset actually used" syntactic
approximation as the previous passes guarantee (at the moment) that all
uses are in the continuation and will thus be caught by this.
This PR enables the module system, in cooperation with the linker, to
separate meta and non-meta code in native binaries. In particular, this
ensures tactics merely used in proofs do not make it into the final
binary. A simple example using `meta import Lean` has its binary size
reduced from 130MB to 1.7MB.
# Breaking change
`importModules (loadExts := true)` must now be preceded by
`enableInitializersExecution`. This was always the case for correct
importing but is now enforced and checked eagerly.
This PR adds two `decide_cbv` stress tests extracted from LNSym (ARMv8
symbolic
simulator, Apache 2.0). `cbv_aes.lean` tests a full AES-128 encryption
on large
bitvector computations. `cbv_arm_ldst.lean` tests ARMv8 load/store
instruction
decoding and execution with nested pattern matching over bitvectors.
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
This PR adds a `cbv` tactic test based on a minimized example extracted
from verifying the Collatz conjecture for small numbers, suggested by
Bhavik Mehta (@b-mehta).
---------
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: Bhavik Mehta <bhavikmehta8@gmail.com>
This PR reverts commit 9b7a8eb7c8. After
some more contemplation on
the implications of these changes I think this is not the direction we
want to move into.
This PR sets up the new integrated test/bench suite. It then migrates
all benchmarks and some related tests to the new suite. There's also
some documentation and some linting.
For now, a lot of the old tests are left alone so this PR doesn't become
even larger than it already is. Eventually, all tests should be migrated
to the new suite though so there isn't a confusing mix of two systems.
This PR fixes an issue where `mutual public structure` would have a
private constructor. The fix copies the fix from #11940.
Closes#10067. Also recloses duplicate issue #11116 (its test case is
added to the test suite).
This PR adds several useful lemmas for `List`, `Array` and `Vector`
whenever they were missing, improving API coverage and consistency among
these types.
- `size_singleton`/`sum_singleton`/`sum_push`
-
`foldlM_toArray`/`foldlM_toList`/`foldl_toArray`/`foldl_toList`/`foldrM_toArray`/`foldrM_toList`/`foldr_toList`
- `toArray_toList`
- `foldl_eq_apply_foldr`/`foldr_eq_apply_foldl`, `foldr_eq_foldl`:
relates `foldl` and `foldr` for associative operations with identity
- `sum_eq_foldl`: relates sum to `foldl` for associative operations with
identity
- `Perm.pairwise_iff`/`Perm.pairwise`: pairwise properties are preserved
under permutations of arrays
This PR provides `WellFounded.partialExtrinsicFix`, which makes it
possible to implement and verify partially terminating functions, safely
building on top of the seemingly less general `extrinsicFix` (which is
now called `totalExtrinsicFix`). A proof of termination is only
necessary in order to formally verify the behavior of
`partialExtrinsicFix`.
This PR changes all `lean-toolchain` to use relative toolchain paths
instead of `lean4` and `lean4-stage0` identifiers, which removes the
need for manually linking toolchains via Elan.
After this PR, at least Elan 4.2.0 and 0.0.224 of the Lean VS Code
extension will be needed to edit core.
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
