Joachim Breitner c2d4079193 perf: optimize string literal equality simprocs for kernel efficiency (#12887) ... This PR optimizes the `String.reduceEq`, `String.reduceNe`, and `Sym.Simp` string equality simprocs to produce kernel-efficient proofs. Previously, these used `String.decEq` which forced the kernel to run UTF-8 encoding/decoding and byte array comparison, causing 86+ kernel unfoldings on short strings. The new approach reduces string inequality to `List Char` via `String.ofList_injective`, then uses two strategies depending on the difference: - **Different characters at position `i`**: Projects to `Nat` via `congrArg (fun l => (List.get!Internal l i).toNat)`, then uses `Nat.ne_of_beq_eq_false rfl`. This avoids `Decidable` instances entirely — the kernel only evaluates `Nat.beq` on two concrete natural numbers. - **One string is a prefix of the other**: Uses `congrArg (List.drop n ·)` with `List.cons_ne_nil`, which is a definitional proof requiring no `decide` step at all. For equal strings, `eq_true rfl` avoids kernel evaluation entirely. The shared proof construction is in `Lean.Meta.mkStringLitNeProof` (`Lean/Meta/StringLitProof.lean`), used by both the standard simprocs and the `Sym.Simp` ground evaluator. Kernel max unfolds for `"hello" ≠ "foo"`: 86+ → 6. --------- Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>		2026-03-14 10:30:31 +00:00
..
Compiler	feat: option to ignore borrowing annotations completely (#12886)	2026-03-11 20:59:06 +00:00
Data	feat: update RPC wire format (#12905)	2026-03-13 23:46:16 +00:00
DocString	fix: error messages from Verso docstring parser (#12372)	2026-02-07 07:49:06 +00:00
Elab	test: add dite and match splitting to sym-based MVCGen (#12903)	2026-03-12 22:39:43 +00:00
Language	chore: shake core (#12276)	2026-02-05 09:10:32 +00:00
LibrarySuggestions	chore: fix core after rebootstrap	2026-02-25 11:40:02 +01:00
Linter	fix: make option linter.unusedSimpArgs respect linter.all (#12560)	2026-03-09 15:12:02 +00:00
Meta	perf: optimize string literal equality simprocs for kernel efficiency (#12887)	2026-03-14 10:30:31 +00:00
Parser	feat: support expected type annotation in doPatDecl (#12866)	2026-03-10 11:42:03 +00:00
ParserCompiler
PrettyPrinter	chore: deprecate levelZero and levelOne (#12720)	2026-03-04 01:03:08 +00:00
Server	feat: update RPC wire format (#12905)	2026-03-13 23:46:16 +00:00
Util	feat: add structured TraceResult to TraceData (#12698)	2026-03-10 02:42:57 +00:00
Widget	feat: use StateT.run instead of function application (#5121)	2026-03-03 03:12:26 +00:00
AddDecl.lean	feat: add structured TraceResult to TraceData (#12698)	2026-03-10 02:42:57 +00:00
Attributes.lean	fix: run @[init] declarations in declaration order (#12221)	2026-01-29 15:32:56 +00:00
AuxRecursor.lean	perf: add introSubstEq shortcut (#12190)	2026-01-28 12:33:14 +00:00
BuiltinDocAttr.lean
Class.lean	feat: add [univ_out_params] (#12423)	2026-02-11 15:42:00 +00:00
Compiler.lean	feat: unify name demangling with single Lean implementation (#12539)	2026-03-06 12:29:35 +00:00
CoreM.lean	doc: remark that CoreM.toIO ignores ctx.initHeartbeats (#12859)	2026-03-10 21:34:11 +00:00
Data.lean	feat: persistent hash map iterator (#12852)	2026-03-10 08:01:32 +00:00
Declaration.lean	chore: shake core (#12276)	2026-02-05 09:10:32 +00:00
DeclarationRange.lean
DefEqAttrib.lean
DocString.lean
Elab.lean	feat: idbg interactive debug expression evaluator (#12648)	2026-02-23 17:22:44 +00:00
EnvExtension.lean	fix: mark failed compilations as noncomputable (#12625)	2026-02-23 09:18:21 +00:00
Environment.lean	perf: separate meta and non-meta initializers (#12016)	2026-02-26 08:05:19 +00:00
ErrorExplanation.lean	chore: shake core (#12276)	2026-02-05 09:10:32 +00:00
Exception.lean
Expr.lean	chore: use terminology "non-recursive structure" instead of "struct-like" (#12749)	2026-03-09 03:44:38 +00:00
ExtraModUses.lean
HeadIndex.lean
Hygiene.lean
IdentifierSuggestion.lean	chore: shake core (#12276)	2026-02-05 09:10:32 +00:00
ImportingFlag.lean
InternalExceptionId.lean	chore: shake core (#12276)	2026-02-05 09:10:32 +00:00
KeyedDeclsAttribute.lean
LabelAttribute.lean	chore: shake core (#12276)	2026-02-05 09:10:32 +00:00
Level.lean	chore: deprecate levelZero and levelOne (#12720)	2026-03-04 01:03:08 +00:00
LibrarySuggestions.lean
Linter.lean
LoadDynlib.lean	chore: shake core (#12276)	2026-02-05 09:10:32 +00:00
LocalContext.lean	feat: new, extensible do elaborator (#12459)	2026-02-21 17:17:29 +00:00
Log.lean
Message.lean	feat: add structured TraceResult to TraceData (#12698)	2026-03-10 02:42:57 +00:00
Meta.lean	refactor: have telescope support (#11914)	2026-01-06 19:20:25 +00:00
MetavarContext.lean	perf: fuse fvar substitution into instantiateMVars (#12233)	2026-03-09 17:05:21 +00:00
Modifiers.lean
MonadEnv.lean	chore: turn on new do elaborator in Core (#12656)	2026-03-09 12:38:33 +00:00
Namespace.lean
OriginalConstKind.lean	refactor: move getOriginalConstKind? into its own module to avoid future import cycle (#12265)	2026-02-01 16:18:51 +00:00
Parser.lean
ParserCompiler.lean	chore: shake core (#12276)	2026-02-05 09:10:32 +00:00
PrettyPrinter.lean	chore: shake core (#12276)	2026-02-05 09:10:32 +00:00
PrivateName.lean
ProjFns.lean	fix: detect stuck mvars through auxiliary parent projections (#12564)	2026-02-23 03:46:06 +00:00
ReducibilityAttrs.lean	refactor: rename instance_reducible to implicit_reducible (#12567)	2026-02-18 22:19:16 +00:00
Replay.lean	feat: add declaration name to leanchecker error messages (#12525)	2026-02-17 16:08:00 +00:00
ReservedNameAction.lean	feat: add structured TraceResult to TraceData (#12698)	2026-03-10 02:42:57 +00:00
ResolveName.lean	fix: pretty printing of constants should consider accessibility of names (#12654)	2026-02-25 00:01:19 +00:00
Runtime.lean
ScopedEnvExtension.lean
Server.lean
Setup.lean	perf: separate meta and non-meta initializers (#12016)	2026-02-26 08:05:19 +00:00
Shell.lean	refactor: port EmitC to LCNF (#12781)	2026-03-11 14:19:54 +00:00
Structure.lean	chore: use terminology "non-recursive structure" instead of "struct-like" (#12749)	2026-03-09 03:44:38 +00:00
SubExpr.lean	chore: shake core (#12276)	2026-02-05 09:10:32 +00:00
Syntax.lean	feat: order instances for string positions (#12641)	2026-02-23 08:20:52 +00:00
ToExpr.lean
ToLevel.lean	fix: address unused simp theorem warnings (#12829)	2026-03-06 23:12:03 +00:00
Util.lean
Widget.lean