Update lean4_release_notes.jsonl

lean4_release_notes.jsonl

@@ -995,4 +995,446 @@
 {"Version": "v4.12.0", "section": "Breaking changes", "text": "The parameters to `Membership.mem` are swapped, which affects `SetLike` usage. (#5020)", "pull request": "5020"}
 {"Version": "v4.12.0", "section": "Breaking changes", "text": "`List.getElem_drop` and `List.getElem_drop'` got reversed. (#5210)", "pull request": "5210"}
 {"Version": "v4.12.0", "section": "Breaking changes", "text": "`Parsec` moved from `Lean.Data.Parsec` to `Std.Internal.Parsec`. It's now more general. For strings, use `Parser` in `Std.Internal.Parsec.String`. (#4774)", "pull request": "4774"}
-{"Version": "v4.12.0", "section": "Breaking changes", "text": "`Lean.HashMap` and `Lean.HashSet` are deprecated in favor of `Std.HashMap/Std.HashSet`. Query functions are renamed, `map[key]` expects presence. (#4943, #4954)", "pull request": "4943"}
+{"Version": "v4.12.0", "section": "Breaking changes", "text": "`Lean.HashMap` and `Lean.HashSet` are deprecated in favor of `Std.HashMap/Std.HashSet`. Query functions are renamed, `map[key]` expects presence. (#4943, #4954)", "pull request": "4943"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "The variable inclusion mechanism has been changed. Like before, when a definition mentions a variable, Lean will add it as an argument of the definition, but now in theorem bodies, variables are not included based on usage in order to ensure that changes to the proof cannot change the statement of the overall theorem. Instead, variables are only available to the proof if they have been mentioned in the theorem header or in an include command or are instance implicit and depend only on such variables. The omit command can be used to omit included variables. See breaking changes below. PR references follow.", "pull request": "4883"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Structural recursion can now be explicitly requested using `termination_by structural x` in analogy to the existing `termination_by x` syntax for well-founded recursion. See PR for details.", "pull request": "4542"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Fixes a bug that could lead to ill-typed terms in structural recursion. See PR for details.", "pull request": "4672"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "The `termination_by?` syntax no longer forces well-founded recursion. When structural recursion is inferred, it prints the result using `termination_by structural` syntax.", "pull request": "N/A"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Mutual structural recursion is now supported, both for mutual recursion over a non-mutual data type, as well as recursion over mutual or nested data types. Nested structural recursion is still not supported. The system also generates functional induction principles (f.induct, f.mutual_induct) for these definitions.", "pull request": "4639"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Unnecessary termination_by clauses now produce warnings, not errors.", "pull request": "4809"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Improves handling of nested structural recursion through non-recursive types in certain cases.", "pull request": "4831"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Improves structural recursion over inductive predicates with reflexive arguments.", "pull request": "4839"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Sets Simp.Config.implicitDefEqProofs to true by default (simp tactic).", "pull request": "4784"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Normalizes the order of constraints in error messages (omega tactic).", "pull request": "4612"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Prevents pushing casts into multiplications unless it produces a non-trivial linear combination (omega tactic).", "pull request": "469l"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Decide tactic now uses at least default transparency when reducing the Decidable instance.", "pull request": "4711"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Adds detailed feedback on decide tactic failure, including blame for non-reducing or classical instances, with hints for solutions.", "pull request": "4674"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Makes @[ext] realize ext_iff theorems from user ext theorems. Also includes more robust local/scoped usage. The ext_iff theorem preserves instance implicit binder types rather than making all binder types implicit.", "pull request": "4762"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Makes 'go to definition' work for @[ext] generated lemmas. Adjusts core library usage of ext_iff generation.", "pull request": "4694"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Makes ext_iff theorem preserve inst implicit binder types rather than making all binder types implicit.", "pull request": "4710"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Introduces a safer #eval that prevents evaluation of terms containing sorry, helping avoid Lean process crashes. A new #eval! command reverts to the previous unsafe behavior.", "pull request": "4810"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Adjusts a test to accommodate the new #eval safety checks.", "pull request": "4829"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Adds #discr_tree_key and #discr_tree_simp_key commands for debugging discrimination tree keys, including simp lemma left-hand side transformations.", "pull request": "4447"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Changes option parsing to allow user-defined options from the command line. Initial options are re-parsed and validated after importing. Also discards 'weak.'-prefixed command line option assignments if the underlying option does not exist.", "pull request": "4741"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Improves the construction of the BEq deriving handler, enabling better code generation.", "pull request": "7253ef"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Improves the construction of the BEq deriving handler, enabling better code generation.", "pull request": "a04f3c"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Makes BEq deriving handler work when there are dependently typed fields.", "pull request": "86af04"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Refactors DecidableEq deriving to use 'termination_by structural'.", "pull request": "4826"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Adds unresolveNameGlobalAvoidingLocals to metaprogramming support.", "pull request": "4593"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Deletes deprecated functions from 2022 in Lean's metaprogramming layer.", "pull request": "4618"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Adds Meta.lambdaBoundedTelescope to metaprogramming support.", "pull request": "4642"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Adds Meta.withErasedFVars for entering a context where certain fvars are removed from the local context.", "pull request": "4731"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Adds assignment validation at closeMainGoal, preventing tactics from bypassing the occurs check via exact, etc.", "pull request": "4777"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Introduces Lean.Meta.PProdN for packing and projecting nested PProds in metaprogramming code.", "pull request": "4807"}
+{"Version": "v4.11.0", "section": "Language features, tactics, and metaprograms", "text": "Fixes Syntax.unsetTrailing, enabling 'go to definition' to work on the last module name in an import block.", "pull request": "5170"}
+{"Version": "v4.11.0", "section": "Language server, widgets, and IDE extensions", "text": "Responses to info view requests come as soon as the relevant tactic finishes execution.", "pull request": "4727"}
+{"Version": "v4.11.0", "section": "Language server, widgets, and IDE extensions", "text": "Whitespace changes do not invalidate imports, so starting to type the first declaration after imports no longer triggers reloading them.", "pull request": "4580"}
+{"Version": "v4.11.0", "section": "Language server, widgets, and IDE extensions", "text": "Fixes an issue where hovering over unimported builtin names could cause a panic.", "pull request": "4780"}
+{"Version": "v4.11.0", "section": "Pretty printing", "text": "Fixes pp.instantiateMVars setting and changes its default to true.", "pull request": "4558"}
+{"Version": "v4.11.0", "section": "Pretty printing", "text": "Ensures syntax nodes always run their formatters, fixing an issue with ppSpace in macros or elab commands not producing a space.", "pull request": "4631"}
+{"Version": "v4.11.0", "section": "Pretty printing", "text": "Fixes a bug with overly hoverable signatures in #check caused by pp.tagAppFns being set. Hover is now more precise.", "pull request": "4665"}
+{"Version": "v4.11.0", "section": "Pretty printing", "text": "Makes match pretty printer obey pp.explicit, so hovering over a match in Infoview shows the underlying term if explicit is on.", "pull request": "4724"}
+{"Version": "v4.11.0", "section": "Pretty printing", "text": "Documents why anonymous constructor notation is not flattened in pretty printing.", "pull request": "4764"}
+{"Version": "v4.11.0", "section": "Pretty printing", "text": "Parenthesizer changes so only parentheses are hoverable. The parentheses 'steal' the term info from the enclosed expression.", "pull request": "4786"}
+{"Version": "v4.11.0", "section": "Pretty printing", "text": "Allows arbitrarily long sequences of optional arguments to be omitted from the end of applications, rather than just one.", "pull request": "4854"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adds bitwise lemmas Nat.and_le_(left|right).", "pull request": "4597"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adds simprocs for simplifying bit expressions on Nat.", "pull request": "4874"}
+{"Version": "v4.11.0", "section": "Library", "text": "Fixes performance of HPow Int Nat Int synthesis by rewriting as a NatPow Int instance.", "pull request": "4903"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adds lemmas for UInt* and Fin, including *.and_toNat support.", "pull request": "4605"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adds *.and_toNat for UInt* and Fin, among others.", "pull request": "4629"}
+{"Version": "v4.11.0", "section": "Library", "text": "Option: adds get lemmas such as Option.get for more robust rewriting.", "pull request": "4599"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adds Option.or, a strict version of Option.orElse in the second argument.", "pull request": "4600"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adds getElem_congr for rewriting indices in GetElem operations.", "pull request": "4603"}
+{"Version": "v4.11.0", "section": "Library", "text": "Upstreams List.attach, Array.attach, Subset, Sublist, and Pairwise/Nodup from Batteries, plus more. Adjusts List.replicate simps, simprocs, reorg of list getters, simprocs for literal array indexing, etc. Many references below.", "pull request": "4586"}
+{"Version": "v4.11.0", "section": "Library", "text": "Upstreams List.Subset and List.Sublist from Batteries, plus more improvements. See also #4697, #4706, #4720, #4836, #4837, #4855, #4856, #4866, #4865 for further expansions of List API from mathlib/batteries synergy.", "pull request": "4697"}
+{"Version": "v4.11.0", "section": "Library", "text": "Upstreams List.Pairwise, List.Nodup from Batteries. Adds basic material. Also see #4707 for more Pairwise/Nodup testing, #4790 removing typeclass assumptions on List.Nodup.eraseP, etc.", "pull request": "4706"}
+{"Version": "v4.11.0", "section": "Library", "text": "Upstreams more List.erase API. Also see #4835 cleanup, #4843, #4868, #4877 corrections to List.Subset lemmas, #4882 usage in subexpressions, etc.", "pull request": "4720"}
+{"Version": "v4.11.0", "section": "Library", "text": "Upstreams List.IsPrefix, List.IsSuffix, List.IsInfix plus Decidable instances (#4836, #4837).", "pull request": "4836"}
+{"Version": "v4.11.0", "section": "Library", "text": "Upstreams List.attach, List.findIdx, List.indexOf, List.countP, List.count, List.range' (#4855).", "pull request": "4855"}
+{"Version": "v4.11.0", "section": "Library", "text": "Upstreams more List lemmas (#4856).", "pull request": "4856"}
+{"Version": "v4.11.0", "section": "Library", "text": "Upstreams List.pairwise_iff_getElem (#4866).", "pull request": "4866"}
+{"Version": "v4.11.0", "section": "Library", "text": "Upstreams List.eraseIdx lemmas (#4865).", "pull request": "4865"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adjusts List.replicate simp lemmas and simprocs for more consistent rewriting.", "pull request": "4687"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adds characterizations of List.Sublist (#4704).", "pull request": "4704"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adds simp normal form tests for List.Pairwise and List.Nodup (#4707).", "pull request": "4707"}
+{"Version": "v4.11.0", "section": "Library", "text": "Reorganizes lemmas on list getters (#4708, #4815).", "pull request": "4708"}
+{"Version": "v4.11.0", "section": "Library", "text": "Reorganizes lemmas on list getters (#4708, #4815).", "pull request": "4815"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adds simprocs for literal array accesses like #[1,2,3][2] (#4765).", "pull request": "4765"}
+{"Version": "v4.11.0", "section": "Library", "text": "Removes typeclass assumptions for List.Nodup.eraseP (#4790).", "pull request": "4790"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adds efficient usize functions for array types (#4801).", "pull request": "4801"}
+{"Version": "v4.11.0", "section": "Library", "text": "List.filterMapM now runs left-to-right (#4820). Breaking change in monadic side effects ordering.", "pull request": "4820"}
+{"Version": "v4.11.0", "section": "Library", "text": "Fills in and cleans up gaps in List API (#4835).", "pull request": "4835"}
+{"Version": "v4.11.0", "section": "Library", "text": "Corrects List.Subset lemmas (#4843, #4868, #4877).", "pull request": "4843"}
+{"Version": "v4.11.0", "section": "Library", "text": "Corrects List.Subset lemmas (#4843, #4868, #4877).", "pull request": "4868"}
+{"Version": "v4.11.0", "section": "Library", "text": "Corrects List.Subset lemmas (#4843, #4868, #4877).", "pull request": "4877"}
+{"Version": "v4.11.0", "section": "Library", "text": "Splits Init.Data.List.Lemmas into function-specific files (#4863).", "pull request": "4863"}
+{"Version": "v4.11.0", "section": "Library", "text": "Fixes statement of List.take_takeWhile (#4875).", "pull request": "4875"}
+{"Version": "v4.11.0", "section": "Library", "text": "Removes 'partial' from ByteArray.toList and ByteArray.findIdx?, eliminating partial usage (#4582).", "pull request": "4582"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adds recurrence theorems for bitblasting multiplication on BitVec (#4568).", "pull request": "4568"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adds shiftLeftRec lemmas for BitVec (#4571).", "pull request": "4571"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adds ushiftRightRec and lemmas for BitVec (#4872).", "pull request": "4872"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adds getLsb_replicate for BitVec (#4873).", "pull request": "4873"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adds Std.HashMap as a verified replacement for Lean.HashMap, with rename from remove to erase (#4583).", "pull request": "4583"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adds Inhabited instances for new Std.HashMap (#4682).", "pull request": "4682"}
+{"Version": "v4.11.0", "section": "Library", "text": "Improves BEq argument order in Std.HashMap lemmas (#4732).", "pull request": "4732"}
+{"Version": "v4.11.0", "section": "Library", "text": "Makes lemmas resolve instances via unification in Std.HashMap (#4759).", "pull request": "4759"}
+{"Version": "v4.11.0", "section": "Library", "text": "Documents that HashMap usage should be linear to avoid expensive copies (#4771).", "pull request": "4771"}
+{"Version": "v4.11.0", "section": "Library", "text": "Removes 'bif' from HashMap lemmas (#4791).", "pull request": "4791"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adds more lemmas for Std.HashMap (#4803).", "pull request": "4803"}
+{"Version": "v4.11.0", "section": "Library", "text": "Upstreams SMap.foldM (#4690).", "pull request": "4690"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adds PartialEquivBEq, ReflBEq, EquivBEq, LawfulHashable classes (#4607).", "pull request": "4607"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adds IO.Process.Child.tryWait (#4660).", "pull request": "4660"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adds ×' syntax for PProd and a delaborator for PProd/MProd to print as angle-bracket tuples (#4747, #4730, #4756).", "pull request": "4747"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adds lemmas for cond (#4604).", "pull request": "4604"}
+{"Version": "v4.11.0", "section": "Library", "text": "Changes some definitions into theorems (#4619).", "pull request": "4619"}
+{"Version": "v4.11.0", "section": "Library", "text": "Fixes some names with duplicated namespaces (#4616).", "pull request": "4616"}
+{"Version": "v4.11.0", "section": "Library", "text": "Fixes simp lemmas flagged by the simpNF linter (#4620).", "pull request": "4620"}
+{"Version": "v4.11.0", "section": "Library", "text": "Makes the Antisymm class be a Prop (#4666).", "pull request": "4666"}
+{"Version": "v4.11.0", "section": "Library", "text": "Cleans up unused arguments flagged by linter (#4621).", "pull request": "4621"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adds imports for orphaned Init modules (#4680).", "pull request": "4680"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adds imports for orphaned Std.Data modules (#4679).", "pull request": "4679"}
+{"Version": "v4.11.0", "section": "Library", "text": "Adds forward/backward directions of not_exists (#4688).", "pull request": "4688"}
+{"Version": "v4.11.0", "section": "Library", "text": "Upstreams eq_iff_true_of_subsingleton (#4689).", "pull request": "4689"}
+{"Version": "v4.11.0", "section": "Library", "text": "Fixes precedence handling for Repr negative numbers on Int/Float (#4709).", "pull request": "4709"}
+{"Version": "v4.11.0", "section": "Library", "text": "Renames TC (transitive closure) to Relation.TransGen (#4760).", "pull request": "4760"}
+{"Version": "v4.11.0", "section": "Library", "text": "Fixes List deprecations (#4842).", "pull request": "4842"}
+{"Version": "v4.11.0", "section": "Library", "text": "Upstreams some Mathlib attributes (#4852).", "pull request": "4852"}
+{"Version": "v4.11.0", "section": "Library", "text": "Improves a proof (#93ac63).", "pull request": "93ac63"}
+{"Version": "v4.11.0", "section": "Library", "text": "Generalizes universe for PSigma.exists, renames to Exists.of_psigma_prop (#4862, #4878).", "pull request": "4862"}
+{"Version": "v4.11.0", "section": "Library", "text": "Fixes typos (#4737, #7d2155) and updates docs (#4782, #4869, #4648).", "pull request": "4648"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Enforces isDefEqStuckEx at unstuckMVar, providing better error messages and letting rw produce instance solutions in certain cases (#2736).", "pull request": "4596"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Fixes deprecation warnings for overloaded symbols (#4713).", "pull request": "4713"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Elab_as_elim improvements: checks that inferred motive is type-correct (#4722).", "pull request": "4722"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Elab_as_elim improvements: elaborates arguments for parameters in target types (#4800).", "pull request": "4800"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Elab_as_elim improvements: better handling for explicit motive arguments (#4817).", "pull request": "4817"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Adds a term elaborator for named patterns like n@(n'+1) to detect usage outside pattern-matching contexts (#4792).", "pull request": "4792"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Makes anonymous dot notation work with pi-type-valued type synonyms (#4818).", "pull request": "4818"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "SynthAppInstances improved for rewriting/apply tactics, adding a loop for complex instance ordering (#4646).", "pull request": "4646"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Refactors InductiveVal: isNested -> numNested (#4684, also backported as 98ee78). Modifies kernel representation of inductives.", "pull request": "4684"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Improves performance of Replacement.apply (#4776).", "pull request": "4776"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Fixes .eq_def theorem generation with messy universes (#4712).", "pull request": "4712"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Improves transformation match for IndPredBelow by better finding T.below x (#4841).", "pull request": "4841"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Kernel diagnostics appear if diagnostics is enabled, even if it is the only section (#4611).", "pull request": "4611"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Adds missing profileitM functions (#4753).", "pull request": "4753"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Adds Lean.Expr.numObjs for counting allocated sub-expressions (#4754).", "pull request": "4754"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Adds missing withTraceNodes for trace.profiler (#4769).", "pull request": "4769"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Makes 'use set_option diagnostics true' message conditional on the setting (#4781, #4882).", "pull request": "4781"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Makes 'use set_option diagnostics true' message conditional on the setting (#4781, #4882).", "pull request": "4882"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Adds ShareCommon.shareCommon' (and other related improvements) for common subterm sharing. In large expressions, up to 20x speedup (#4767, #4775, #4887).", "pull request": "4767"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Ensures Expr.replaceExpr preserves DAG structure (#4779).", "pull request": "4779"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Documents performance issues in Expr.replaceExpr (#4783).", "pull request": "4783"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Makes for_each use a precise cache (#4794, #4797, #4798).", "pull request": "4794"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Makes Expr.find?/findExt? use kernel implementations for better caching (#4795).", "pull request": "4795"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Makes Expr.replace use kernel implementation (#4799).", "pull request": "4799"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Makes Expr.foldConsts use a precise cache (#4871).", "pull request": "4871"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Makes expr_eq_fn use a precise cache (#4890).", "pull request": "4890"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Upstreams ToExpr FilePath and compile_time_search_path% (#4453).", "pull request": "4453"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Fixes handling of const2ModIdx in finalizeImport, preferring the original module for a re-declared declaration (#4652).", "pull request": "4652"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Kernel: prevents large Nat exponentiations from evaluating, gate-limited by exponentiation.threshold (#4637).", "pull request": "4637"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Updates comments in kernel/declaration.h (#4683).", "pull request": "4683"}
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+{"Version": "v4.11.0", "section": "Lean internals", "text": "Speeds up replace_rec_fn::apply by avoiding expression copies (#4702).", "pull request": "4702"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Fixes a typo in constants and trace.profiler.useHeartbeats (#4590).", "pull request": "4590"}
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+{"Version": "v4.11.0", "section": "Lean internals", "text": "Improves constructor-as-variable test (#4625).", "pull request": "4625"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Extends a test with example from Zulip (#4740).", "pull request": "4740"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Moves Syntax.hasIdent earlier, shakes dependencies (#4766).", "pull request": "4766"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Splits out Lean.Language.Lean.Types (#4881).", "pull request": "4881"}
+{"Version": "v4.11.0", "section": "Lean internals", "text": "Adds LEAN_EXPORT for sharecommon functions (#4893).", "pull request": "4893"}
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+{"Version": "v4.11.0", "section": "Lean internals", "text": "Docs: Command.Scope (#4748).", "pull request": "4748"}
+{"Version": "v4.11.0", "section": "Compiler, runtime, and FFI", "text": "Moves Std from libleanshared to libInit_shared, fixing Windows build (#4661).", "pull request": "4661"}
+{"Version": "v4.11.0", "section": "Compiler, runtime, and FFI", "text": "Fixes initialization by explicitly calling lean_initialize for Std (#4668).", "pull request": "4668"}
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+{"Version": "v4.11.0", "section": "Lake", "text": "Improves Git checkouts and cloud releases. On error, Lake prints all top-level logs. Forcibly fetches tags. Better error messages. The builtin package facets release, optRelease, extraDep are now consistent. Also supports optional jobs that do not fail the build. afterReleaseSync/afterReleaseAsync now fetch optRelease. See PR (#4735).", "pull request": "4735"}
+{"Version": "v4.11.0", "section": "Lake", "text": "Adds draft CI workflow on new projects (#4608).", "pull request": "4608"}
+{"Version": "v4.11.0", "section": "Lake", "text": "Adds CLI options --log-level and --fail-level to control log printing and build failure triggers (#4847).", "pull request": "4847"}
+{"Version": "v4.11.0", "section": "Lake", "text": "Lake docs (#4853).", "pull request": "4853"}
+{"Version": "v4.11.0", "section": "DevOps/CI", "text": "Release triggers update of release.lean-lang.org (#4531).", "pull request": "4531"}
+{"Version": "v4.11.0", "section": "DevOps/CI", "text": "Adjusts pr-release for new lakefile.lean (#4598).", "pull request": "4598"}
+{"Version": "v4.11.0", "section": "DevOps/CI", "text": "Makes pr-release use correct tag name (#4632).", "pull request": "4632"}
+{"Version": "v4.11.0", "section": "DevOps/CI", "text": "Allows manual triggering of nightly release (#4638).", "pull request": "4638"}
+{"Version": "v4.11.0", "section": "DevOps/CI", "text": "Adds debug output for restart-on-label (#4640). Bumps wait from 10s to 30s (#4663). Updates actions version (#4664, #582d6e).", "pull request": "4640"}
+{"Version": "v4.11.0", "section": "DevOps/CI", "text": "Bumps download-artifact to 582d6e. Adds back check-stage3 (6d9718). Adds Jira sync for FRO (0768ad).", "pull request": "582d6e"}
+{"Version": "v4.11.0", "section": "DevOps/CI", "text": "Adds support for reporting CI errors on FRO Zulip (#4830).", "pull request": "4830"}
+{"Version": "v4.11.0", "section": "DevOps/CI", "text": "Adds nightly_bump_toolchain trigger on mathlib4 (#4838).", "pull request": "4838"}
+{"Version": "v4.11.0", "section": "DevOps/CI", "text": "Fixes msys2 (#abf420).", "pull request": "abf420"}
+{"Version": "v4.11.0", "section": "DevOps/CI", "text": "Deprecates Nix-based builds, removing interactive components (#4895).", "pull request": "4895"}
+{"Version": "v4.11.0", "section": "DevOps/CI", "text": "Updates release checklist (#4693, #4458, #4876).", "pull request": "4693"}
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+{"Version": "v4.11.0", "section": "DevOps/CI", "text": "Updates the quickstart guide (#4806).", "pull request": "4806"}
+{"Version": "v4.11.0", "section": "DevOps/CI", "text": "Documents triage team in the contribution guide (c02aa9).", "pull request": "c02aa9"}
+{"Version": "v4.11.0", "section": "Breaking changes", "text": "For @[ext]-generated ext/ext_iff lemmas, the x and y arguments are now implicit, and these lemmas are protected. (#4543).", "pull request": "4543"}
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+{"Version": "v4.11.0", "section": "Breaking changes", "text": "A bugfix in structural recursion may break existing code if a parameter is behind indices in the recursive argument. Reordering parameters can fix it (#4672).", "pull request": "4672"}
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+{"Version": "v4.11.0", "section": "Breaking changes", "text": "The effect of the variable command on theorem bodies changed. Section variables are no longer included based on usage inside proofs; only the theorem signature, includes, or instance implicits referencing included variables cause them to be included. This ensures theorem statements do not change if the proof changes. For porting, set_option deprecated.oldSectionVars true can revert to old behavior (#4883 etc.).", "pull request": "N/A"}
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+{"Version": "v4.10.0", "section": "Language features, tactics, and metaprograms", "text": "Improves the accuracy of used simp lemmas reported by simp?.", "pull request": "4567"}
+{"Version": "v4.10.0", "section": "Language features, tactics, and metaprograms", "text": "Makes the omega tactic generate error messages lazily, improving performance when used in tactic combinators.", "pull request": "4360"}
+{"Version": "v4.10.0", "section": "Language features, tactics, and metaprograms", "text": "Works around changes to the definition of Fin.sub in bv_omega tactic.", "pull request": "4579"}
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+{"Version": "v4.10.0", "section": "Commands", "text": "Fixes a discrepancy in universe parameter order between theorem and def declarations.", "pull request": "4408"}
+{"Version": "v4.10.0", "section": "Commands", "text": "Fixes a discrepancy in the elaborators for theorem, def, and example, making Prop-valued examples and other definition commands elaborate like theorems.", "pull request": "4493"}
+{"Version": "v4.10.0", "section": "Commands", "text": "Fixes a discrepancy in the elaborators for theorem, def, and example, making Prop-valued examples and other definition commands elaborate like theorems.", "pull request": "4482"}
+{"Version": "v4.10.0", "section": "Commands", "text": "Fixes an elaboration bug in #check_tactic.", "pull request": "4489"}
+{"Version": "v4.10.0", "section": "Commands", "text": "Adds support for open _root_.<namespace>.", "pull request": "4505"}
+{"Version": "v4.10.0", "section": "Options", "text": "Adds the debug.byAsSorry option, which elaborates all 'by ...' terms as 'sorry'.", "pull request": "4576"}
+{"Version": "v4.10.0", "section": "Language features, tactics, and metaprograms", "text": "Adds a linter to flag local variables whose names coincide with argumentless constructors of their type. The linter can be disabled with set_option linter.constructorNameAsVariable false. Also improves error messages suggesting similar valid constructor names.", "pull request": "4301"}
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+{"Version": "v4.10.0", "section": "Other fixes or improvements", "text": "Fixes error message range for the cdot focusing tactic.", "pull request": "4528"}
+{"Version": "v4.10.0", "section": "Language server, widgets, and IDE extensions", "text": "Makes the watchdog be more resilient against badly behaving clients.", "pull request": "4443"}
+{"Version": "v4.10.0", "section": "Pretty printing", "text": "Restores fallback pretty printers when context is not available, and documents addMessageContext.", "pull request": "4433"}
+{"Version": "v4.10.0", "section": "Pretty printing", "text": "Introduces pp.maxSteps option and sets the default value of pp.deepTerms to false, to keep excessively large or deep terms from overwhelming the Infoview.", "pull request": "4556"}
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+{"Version": "v4.10.0", "section": "Library", "text": "Makes Array.toArrayAux_eq be a simp lemma.", "pull request": "4389"}
+{"Version": "v4.10.0", "section": "Library", "text": "Improves robustness of the proof for Array.reverse_data.", "pull request": "4399"}
+{"Version": "v4.10.0", "section": "Library", "text": "Improves the organization of the List API.", "pull request": "4469"}
+{"Version": "v4.10.0", "section": "Library", "text": "Further improves the organization of the List API.", "pull request": "4475"}
+{"Version": "v4.10.0", "section": "Library", "text": "Improves the List.set and List.concat API.", "pull request": "4470"}
+{"Version": "v4.10.0", "section": "Library", "text": "Upstreams lemmas about List.filter from Batteries.", "pull request": "4472"}
+{"Version": "v4.10.0", "section": "Library", "text": "Adjusts @[simp] attributes for List.", "pull request": "4473"}
+{"Version": "v4.10.0", "section": "Library", "text": "Makes List.getElem?_eq_getElem be a simp lemma.", "pull request": "4488"}
+{"Version": "v4.10.0", "section": "Library", "text": "Adds missing List.replicate API.", "pull request": "4487"}
+{"Version": "v4.10.0", "section": "Library", "text": "Adds lemmas about List.map.", "pull request": "4521"}
+{"Version": "v4.10.0", "section": "Library", "text": "Changes List.length_cons to use as.length + 1 instead of as.length.succ.", "pull request": "4500"}
+{"Version": "v4.10.0", "section": "Library", "text": "Fixes the statement of List.filter_congr.", "pull request": "4524"}
+{"Version": "v4.10.0", "section": "Library", "text": "Changes binder explicitness in List.bind_map.", "pull request": "4525"}
+{"Version": "v4.10.0", "section": "Library", "text": "Adds maximum?_eq_some_iff' and minimum?_eq_some_iff?.", "pull request": "4550"}
+{"Version": "v4.10.0", "section": "Library", "text": "Switches the normal forms for indexing List and Array to xs[n] and xs[n]? rather than using List.get or Array.get.", "pull request": "4400"}
+{"Version": "v4.10.0", "section": "Library", "text": "Fixes linearity in HashMap.insert and HashMap.erase, leading to a 40% speedup in a replace-heavy workload.", "pull request": "4372"}
+{"Version": "v4.10.0", "section": "Library", "text": "Generalizes type of Option.forM from Unit to PUnit.", "pull request": "4403"}
+{"Version": "v4.10.0", "section": "Library", "text": "Removes simp attribute from Option.elim and adds it to individual reduction lemmas, making unfolding less aggressive.", "pull request": "4504"}
+{"Version": "v4.10.0", "section": "Library", "text": "Adds missing theorems for n + 1 and n - 1 normal forms.", "pull request": "4242"}
+{"Version": "v4.10.0", "section": "Library", "text": "Makes Nat.min_assoc be a simp lemma.", "pull request": "4486"}
+{"Version": "v4.10.0", "section": "Library", "text": "Moves @[simp] from Nat.pred_le to Nat.sub_one_le.", "pull request": "4522"}
+{"Version": "v4.10.0", "section": "Library", "text": "Changes various Nat.succ n to n + 1.", "pull request": "4532"}
+{"Version": "v4.10.0", "section": "Library", "text": "Adds complete div/mod simprocs for Int.", "pull request": "3850"}
+{"Version": "v4.10.0", "section": "Library", "text": "Makes the byte-size interface be Nat-valued with Char.utf8Size and String.utf8ByteSize, replacing Char.csize.", "pull request": "4357"}
+{"Version": "v4.10.0", "section": "Library", "text": "Upstreams Char.ext from Batteries and adds some Char documentation to the manual.", "pull request": "4438"}
+{"Version": "v4.10.0", "section": "Library", "text": "Adjusts Fin.sub to be more performant in definitional equality checks.", "pull request": "4421"}
+{"Version": "v4.10.0", "section": "Library", "text": "Adds missing Prod.map lemmas.", "pull request": "4526"}
+{"Version": "v4.10.0", "section": "Library", "text": "Fixes binder explicitness in Prod lemmas.", "pull request": "4533"}
+{"Version": "v4.10.0", "section": "Library", "text": "Adds missing simproc for BitVec equality.", "pull request": "4428"}
+{"Version": "v4.10.0", "section": "Library", "text": "Adds BitVec.twoPow and lemmas, toward bitblasting multiplication for LeanSAT.", "pull request": "4417"}
+{"Version": "v4.10.0", "section": "Library", "text": "Introduces Std, a library situated between Init and Lean, providing functionality not in the prelude both to Lean's implementation and to external users.", "pull request": "4499"}
+{"Version": "v4.10.0", "section": "Library", "text": "Standardizes on using (· == a) over (a == ·).", "pull request": "3056"}
+{"Version": "v4.10.0", "section": "Library", "text": "Fixes errors found by running the library through the Batteries linters.", "pull request": "4502"}
+{"Version": "v4.10.0", "section": "Lean internals", "text": "Makes getBitVecValue? recognize BitVec.ofNatLt.", "pull request": "4391"}
+{"Version": "v4.10.0", "section": "Lean internals", "text": "Adjusts instantiateMVars algorithm to zeta-reduce let expressions while beta reducing instantiated metavariables.", "pull request": "4410"}
+{"Version": "v4.10.0", "section": "Lean internals", "text": "Fixes occurs check for metavariable assignments to also take metavariable types into account.", "pull request": "4420"}
+{"Version": "v4.10.0", "section": "Lean internals", "text": "Fixes forEachModuleInDir to iterate over each Lean file exactly once.", "pull request": "4425"}
+{"Version": "v4.10.0", "section": "Lean internals", "text": "Adds support to build Lean core oleans using Lake.", "pull request": "3886"}
+{"Version": "v4.10.0", "section": "Lean internals", "text": "Improves performance of isDefEq by eta reducing lambda-abstracted terms during metavariable assignments, since they're beta reduced anyway at instantiation.", "pull request": "4387"}
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+{"Version": "v4.10.0", "section": "Lean internals", "text": "Fixes handling of metavariables when caching results at synthInstance?.", "pull request": "4530"}
+{"Version": "v4.10.0", "section": "Lean internals", "text": "Makes 'don't know how to synthesize implicit argument' errors more reliably report the argument name.", "pull request": "4426"}
+{"Version": "v4.10.0", "section": "Lean internals", "text": "Fixes a name resolution bug for generalized field notation (dot notation).", "pull request": "4497"}
+{"Version": "v4.10.0", "section": "Lean internals", "text": "Blocks the implicit lambda feature for (e :) notation.", "pull request": "4536"}
+{"Version": "v4.10.0", "section": "Lean internals", "text": "Makes it an error for there to be two functions with the same name in a where/let rec block.", "pull request": "4562"}
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+{"Version": "v4.10.0", "section": "Lean internals", "text": "Ports mk_definition_inferring_unsafe to Lean.", "pull request": "4498"}
+{"Version": "v4.10.0", "section": "Lean internals", "text": "Ports recOn construction to Lean.", "pull request": "4516"}
+{"Version": "v4.10.0", "section": "Lean internals", "text": "Ports below and brecOn construction to Lean.", "pull request": "4517"}
+{"Version": "v4.10.0", "section": "Lean internals", "text": "Ports below and brecOn construction to Lean.", "pull request": "4653"}
+{"Version": "v4.10.0", "section": "Lean internals", "text": "Ports below and brecOn construction to Lean.", "pull request": "4651"}
+{"Version": "v4.10.0", "section": "Lean internals", "text": "Adds a more-detailed docstring for PersistentEnvExtension.", "pull request": "4501"}
+{"Version": "v4.10.0", "section": "Lean internals", "text": "Removes @[inline] from NameMap.find?, which caused repeated respecialization at call sites.", "pull request": "4382"}
+{"Version": "v4.10.0", "section": "Lean internals", "text": "Removes the 'you might need to open '{dir}' in your editor' message, now handled by Lake and the VS Code extension.", "pull request": "4424"}
+{"Version": "v4.10.0", "section": "Lean internals", "text": "Improves the performance of CollectMVars and FindMVar.", "pull request": "4451"}
+{"Version": "v4.10.0", "section": "Lean internals", "text": "Adds missing DecidableEq and Repr instances for intermediate structures used by the BitVec and Fin simprocs.", "pull request": "4479"}
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+{"Version": "v4.10.0", "section": "Lean internals", "text": "Adds a workaround for a bug in IndPredBelow.mkBelowMatcher.", "pull request": "4563"}
+{"Version": "v4.10.0", "section": "Cleanup", "text": "Minor cleanup.", "pull request": "4380"}
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+{"Version": "v4.10.0", "section": "Compiler, runtime, and FFI", "text": "Exposes the compiler flags for the bundled C compiler (clang).", "pull request": "4477"}
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+{"Version": "v4.10.0", "section": "Lake", "text": "Touches up the Lake configuration DSL, allowing string literals instead of identifiers for names, avoids French quotes in lake new/init templates, changes the exe template to use Main, improves the math template error if lean-toolchain fails to download, and downgrades unknown config fields from error to warning for cross-version compatibility.", "pull request": "4439"}
+{"Version": "v4.10.0", "section": "Lake", "text": "Tweaks require syntax and updates docs. Now require in TOML for a package like doc-gen4 does not need French quotes.", "pull request": "4496"}
+{"Version": "v4.10.0", "section": "Lake", "text": "Fixes a bug where package versions in indirect dependencies would take precedence over direct dependencies.", "pull request": "4485"}
+{"Version": "v4.10.0", "section": "Lake", "text": "Fixes a bug where Lake incorrectly included the module dynamic library in a platform-independent trace.", "pull request": "4478"}
+{"Version": "v4.10.0", "section": "Lake", "text": "Fixes issues with bad import errors, so a bad import in an executable no longer prevents building its root module. Also shows transitive bad import locations. The root module now respects nativeFacets.", "pull request": "4529"}
+{"Version": "v4.10.0", "section": "Lake", "text": "Fixes a bug where non-identifier script names could not be entered on the CLI without French quotes.", "pull request": "4564"}
+{"Version": "v4.10.0", "section": "Lake", "text": "Addresses issues with precompiled libraries, ensuring Lake no longer always precompiles the package of a module. If a module is precompiled, it now also precompiles its imports.", "pull request": "4566"}
+{"Version": "v4.10.0", "section": "Lake", "text": "Adds a new type of require that fetches package metadata from a registry API endpoint (like Reservoir) and then clones a Git package. This helps Lake pick the correct default branch if it's not 'master'.", "pull request": "4495"}
+{"Version": "v4.10.0", "section": "Lake", "text": "Adds new type of registry-based require, improving how Lake fetches metadata from endpoints like Reservoir for packages with non-'master' default branches.", "pull request": "4692"}
+{"Version": "v4.10.0", "section": "Lake", "text": "Further improves the new registry require feature, letting Lake handle the RESERVIOR_API_URL environment variable for alternative registry endpoints.", "pull request": "4849"}
+{"Version": "v4.10.0", "section": "DevOps/CI", "text": "Uses Namespace runners for CI for leanprover/lean4.", "pull request": "4427"}
+{"Version": "v4.10.0", "section": "DevOps/CI", "text": "Fixes speedcenter tests in CI.", "pull request": "4440"}
+{"Version": "v4.10.0", "section": "DevOps/CI", "text": "Fixes that a workflow change would break CI for unrebased PRs.", "pull request": "4441"}
+{"Version": "v4.10.0", "section": "DevOps/CI", "text": "Fixes Wasm release-ci.", "pull request": "4442"}
+{"Version": "v4.10.0", "section": "DevOps/CI", "text": "Causes releases to be marked as prerelease on GitHub.", "pull request": "4544"}
+{"Version": "v4.10.0", "section": "DevOps/CI", "text": "Switches Lake to using src/lake/lakefile.toml to avoid needing to load a version of Lake to build Lake.", "pull request": "4446"}
+{"Version": "v4.10.0", "section": "Nix", "text": "Adds gdb to the Nix shell.", "pull request": "4476"}
+{"Version": "v4.10.0", "section": "Nix", "text": "Adds a platform-dependent flag to the lib target in Nix builds.", "pull request": "3811"}
+{"Version": "v4.10.0", "section": "Nix", "text": "Links -lStd back into Nix build flags on Darwin, fixing a build issue.", "pull request": "4587"}
+{"Version": "v4.9.0", "section": "Language features, tactics, and metaprograms", "text": "Adds the seal and unseal commands, which make definitions locally irreducible or semireducible.", "pull request": "4053"}
+{"Version": "v4.9.0", "section": "Language features, tactics, and metaprograms", "text": "Marks functions defined by well-founded recursion with @[irreducible] by default, preventing expensive unfolding.", "pull request": "4061"}
+{"Version": "v4.9.0", "section": "Incrementality", "text": "Extends incremental elaboration into definition headers, bodies, and tactics.", "pull request": "3940"}
+{"Version": "v4.9.0", "section": "Incrementality", "text": "Improves resilience by ensuring incremental commands and tactics are only reached in supported ways.", "pull request": "4259"}
+{"Version": "v4.9.0", "section": "Incrementality", "text": "Adds special handling for := by so that stray tokens in tactic blocks do not inhibit incrementality.", "pull request": "4268"}
+{"Version": "v4.9.0", "section": "Incrementality", "text": "Adds incremental have tactic.", "pull request": "4308"}
+{"Version": "v4.9.0", "section": "Incrementality", "text": "Fixes incorrect info tree reuse with incremental elaboration.", "pull request": "4340"}
+{"Version": "v4.9.0", "section": "Incrementality", "text": "Adds incrementality for careful command macros such as set_option in theorem, theorem foo.bar, and lemma.", "pull request": "4364"}
+{"Version": "v4.9.0", "section": "Incrementality", "text": "Adds a conservative fix for whitespace handling to avoid incremental reuse showing goals in front of the cursor.", "pull request": "4395"}
+{"Version": "v4.9.0", "section": "Incrementality", "text": "Fixes non-incremental commands in macros blocking further incremental reporting.", "pull request": "4407"}
+{"Version": "v4.9.0", "section": "Incrementality", "text": "Fixes incremental reporting when there are nested tactics in terms.", "pull request": "4436"}
+{"Version": "v4.9.0", "section": "Incrementality", "text": "Adds incrementality support for next and if tactics.", "pull request": "4459"}
+{"Version": "v4.9.0", "section": "Incrementality", "text": "Disables incrementality for tactics-in-terms-in-tactics.", "pull request": "4554"}
+{"Version": "v4.9.0", "section": "Language features, tactics, and metaprograms", "text": "Ensures that the names used for functional induction are reserved.", "pull request": "4135"}
+{"Version": "v4.9.0", "section": "Language features, tactics, and metaprograms", "text": "Adds support for structural recursion on reflexive types (example: Many α).", "pull request": "4327"}
+{"Version": "v4.9.0", "section": "Language features, tactics, and metaprograms", "text": "Normalizes all line endings to LF before processing, making Lean insensitive to CRLF vs LF.", "pull request": "3903"}
+{"Version": "v4.9.0", "section": "Language features, tactics, and metaprograms", "text": "Makes the tactic framework able to recover from runtime errors like deterministic timeouts or max recursion depth.", "pull request": "4130"}
+{"Version": "v4.9.0", "section": "split tactic", "text": "Fixes split at h when h has forward dependencies.", "pull request": "4211"}
+{"Version": "v4.9.0", "section": "split tactic", "text": "Allows split for if-expressions to work on non-propositional goals.", "pull request": "4349"}
+{"Version": "v4.9.0", "section": "apply tactic", "text": "Improves error messages by displaying implicit arguments in unification errors as needed (MessageData changes).", "pull request": "3929"}
+{"Version": "v4.9.0", "section": "cases tactic", "text": "Adds support for unifying large offsets like x + 20000 = 20001.", "pull request": "4224"}
+{"Version": "v4.9.0", "section": "omega tactic", "text": "Lets omega fall back to classical Decidable instances for contradiction proofs.", "pull request": "4073"}
+{"Version": "v4.9.0", "section": "omega tactic", "text": "Fixes a bug in omega tactic.", "pull request": "4141"}
+{"Version": "v4.9.0", "section": "omega tactic", "text": "Fixes another bug in omega tactic.", "pull request": "4184"}
+{"Version": "v4.9.0", "section": "omega tactic", "text": "Improves the error message if no facts are found in the local context.", "pull request": "4264"}
+{"Version": "v4.9.0", "section": "omega tactic", "text": "Improves expression matching by using match_expr.", "pull request": "4358"}
+{"Version": "v4.9.0", "section": "simp tactic", "text": "Makes names of erased lemmas clickable.", "pull request": "4176"}
+{"Version": "v4.9.0", "section": "simp tactic", "text": "Adds a pretty printer for discrimination tree keys.", "pull request": "4208"}
+{"Version": "v4.9.0", "section": "simp tactic", "text": "Adds Simp.Config.index option to control discrimination tree usage, with diagnostics for 'bad keys'.", "pull request": "4202"}
+{"Version": "v4.9.0", "section": "simp tactic", "text": "Prevents internal match equational theorems from appearing in simp trace.", "pull request": "4274"}
+{"Version": "v4.9.0", "section": "simp tactic", "text": "Continues the simp process even if a lemma fails to elaborate, in recovery mode.", "pull request": "4177"}
+{"Version": "v4.9.0", "section": "simp tactic", "text": "Continues the simp process even if a lemma fails to elaborate, in recovery mode.", "pull request": "4359"}
+{"Version": "v4.9.0", "section": "simp tactic", "text": "Fixes panic when applying @[simp] to malformed theorem syntax.", "pull request": "4341"}
+{"Version": "v4.9.0", "section": "simp tactic", "text": "Prevents simp from using the forward version of user-specified backward theorems.", "pull request": "4345"}
+{"Version": "v4.9.0", "section": "simp tactic", "text": "Adds missing dsimp simplifications for fixed parameters in generated congruence theorems.", "pull request": "4352"}
+{"Version": "v4.9.0", "section": "simp tactic", "text": "Improves trace messages for simp so constants are hoverable.", "pull request": "4362"}
+{"Version": "v4.9.0", "section": "Elaboration", "text": "Makes subst notation (he ▸ h) try rewriting in both directions even with no expected type.", "pull request": "4046"}
+{"Version": "v4.9.0", "section": "Elaboration", "text": "Adds support for identifiers in autoparams, e.g. (h : x = y := by exact rfl).", "pull request": "3328"}
+{"Version": "v4.9.0", "section": "Elaboration", "text": "Changes how the type in let/have is elaborated, requiring tactics in the type to be fully evaluated first.", "pull request": "4096"}
+{"Version": "v4.9.0", "section": "Elaboration", "text": "Ensures expression tree elaborator commits to the computed \"max type\" for arithmetic expressions.", "pull request": "4215"}
+{"Version": "v4.9.0", "section": "Elaboration", "text": "Shows signature elaboration errors even if parse errors exist in the body.", "pull request": "4267"}
+{"Version": "v4.9.0", "section": "Elaboration", "text": "Improves error messages when numeric literals fail to synthesize OfNat, including warnings about proposition types.", "pull request": "4368"}
+{"Version": "v4.9.0", "section": "Elaboration", "text": "Fixes nested error messages/infotrees vanishing (snapshot subtrees not restored).", "pull request": "4643"}
+{"Version": "v4.9.0", "section": "Elaboration", "text": "Calculates error suppression per snapshot, letting elaboration errors appear even if there are later parse errors.", "pull request": "4657"}
+{"Version": "v4.9.0", "section": "Metaprogramming", "text": "Adds Lean.MVarId.revertAll to revert all free variables.", "pull request": "4167"}
+{"Version": "v4.9.0", "section": "Metaprogramming", "text": "Adds Lean.MVarId.ensureNoMVar to ensure the goal's target has no expression metavariables.", "pull request": "4169"}
+{"Version": "v4.9.0", "section": "Metaprogramming", "text": "Adds cleanupAnnotations parameter to forallTelescope methods.", "pull request": "4180"}
+{"Version": "v4.9.0", "section": "Metaprogramming", "text": "Adds support for parser aliases in syntax quotations.", "pull request": "4307"}
+{"Version": "v4.9.0", "section": "Work toward implementing grind tactic", "text": "Adds grind_norm and grind_norm_proc attributes and @[grind_norm] theorems.", "pull request": "4164"}
+{"Version": "v4.9.0", "section": "Work toward implementing grind tactic", "text": "Creates grind preprocessor and core module.", "pull request": "4170"}
+{"Version": "v4.9.0", "section": "Work toward implementing grind tactic", "text": "Adds special cases tactic to grind along with @[grind_cases].", "pull request": "4235"}
+{"Version": "v4.9.0", "section": "Work toward implementing grind tactic", "text": "Adds special injection? tactic to grind.", "pull request": "4243"}
+{"Version": "v4.9.0", "section": "Other fixes or improvements", "text": "Fixes a bug in Nat.reduceLeDiff simproc.", "pull request": "4065"}
+{"Version": "v4.9.0", "section": "Other fixes or improvements", "text": "Makes deprecation warnings activate even for generalized field notation.", "pull request": "3969"}
+{"Version": "v4.9.0", "section": "Other fixes or improvements", "text": "Fixes sorry so that it does not activate the implicit lambda feature.", "pull request": "4132"}
+{"Version": "v4.9.0", "section": "Other fixes or improvements", "text": "Fixes the case tactic so it can be used in macros, erasing macro scopes from the tag.", "pull request": "4252"}
+{"Version": "v4.9.0", "section": "Other fixes or improvements", "text": "Fixes bugs in partial calc tactic when there is mdata or metavariables.", "pull request": "4335"}
+{"Version": "v4.9.0", "section": "Other fixes or improvements", "text": "Makes termination_by? report each unused parameter as _.", "pull request": "4329"}
+{"Version": "v4.9.0", "section": "Language server, widgets, and IDE extensions", "text": "Fixes 'Find References' when browsing core Lean sources.", "pull request": "4066"}
+{"Version": "v4.9.0", "section": "Language server, widgets, and IDE extensions", "text": "Allows embedding user widgets in structured messages (companion PR in vscode-lean4#449).", "pull request": "4254"}
+{"Version": "v4.9.0", "section": "Language server, widgets, and IDE extensions", "text": "Makes watchdog more resilient against badly behaving clients.", "pull request": "4445"}
+{"Version": "v4.9.0", "section": "Library", "text": "Upstreams many List and Array operations and theorems from Batteries.", "pull request": "4059"}
+{"Version": "v4.9.0", "section": "Library", "text": "Removes the unused Inhabited instance for Subtype.", "pull request": "4055"}
+{"Version": "v4.9.0", "section": "Library", "text": "Adds dates in existing @[deprecated] attributes.", "pull request": "3967"}
+{"Version": "v4.9.0", "section": "Library", "text": "Adds boilerplate Char, UInt, and Fin theorems.", "pull request": "4231"}
+{"Version": "v4.9.0", "section": "Library", "text": "Fixes the MonadStore type classes to use semiOutParam.", "pull request": "4205"}
+{"Version": "v4.9.0", "section": "Library", "text": "Renames IsLawfulSingleton to LawfulSingleton.", "pull request": "4350"}
+{"Version": "v4.9.0", "section": "Nat", "text": "Swaps Nat.zero_or and Nat.or_zero.", "pull request": "4094"}
+{"Version": "v4.9.0", "section": "Nat", "text": "Changes definition of Nat.mod so n % (m + n) reduces when n is a literal without well-founded recursion.", "pull request": "4098"}
+{"Version": "v4.9.0", "section": "Nat", "text": "Changes definition of Nat.mod to avoid well-founded recursion becoming irreducible by default.", "pull request": "4145"}
+{"Version": "v4.9.0", "section": "Nat", "text": "Redefines Nat.testBit to be more performant.", "pull request": "4188"}
+{"Version": "v4.9.0", "section": "Nat", "text": "Adds theorems for Nat.", "pull request": "4199"}
+{"Version": "v4.9.0", "section": "Array", "text": "Improves functional induction principle Array.feraseIdx.induct.", "pull request": "4074"}
+{"Version": "v4.9.0", "section": "List", "text": "Removes @[simp] from List.length_pos.", "pull request": "4172"}
+{"Version": "v4.9.0", "section": "Option", "text": "Adds theorems to simplify Option-valued dependent if-then-else.", "pull request": "4037"}
+{"Version": "v4.9.0", "section": "Option", "text": "Removes @[simp] from Option.bind_eq_some.", "pull request": "4314"}
+{"Version": "v4.9.0", "section": "BitVec", "text": "Adds theorems for BitVec.", "pull request": "4095"}
+{"Version": "v4.9.0", "section": "BitVec", "text": "Adds simprocs for reducing x >>> i and x <<< i when i is a bitvector literal.", "pull request": "4193"}
+{"Version": "v4.9.0", "section": "BitVec", "text": "Adds simprocs for reducing repeated shifts (x <<< i) <<< j and (x >>> i) >>> j.", "pull request": "4194"}
+{"Version": "v4.9.0", "section": "BitVec", "text": "Redefines rotateLeft/rotateRight to use modulo reduction of the shift offset.", "pull request": "4229"}
+{"Version": "v4.9.0", "section": "BitVec", "text": "Makes <num>#<term> bitvector literal notation global, removing <term>#<term> form.", "pull request": "0d3051 (commit)"}
+{"Version": "v4.9.0", "section": "HashMap", "text": "Fixes implicitness of typeclass arguments in HashMap.ofList.", "pull request": "4248"}
+{"Version": "v4.9.0", "section": "IO", "text": "Adds IO.Process.getCurrentDir and IO.Process.setCurrentDir for adjusting current working directory.", "pull request": "4036"}
+{"Version": "v4.9.0", "section": "Cleanup", "text": "Minor cleanup.", "pull request": "4077"}
+{"Version": "v4.9.0", "section": "Lean internals (Defeq and WHNF)", "text": "Removes unnecessary checkpointDefEq.", "pull request": "4029"}
+{"Version": "v4.9.0", "section": "Lean internals (Defeq and WHNF)", "text": "Fixes isReadOnlyOrSyntheticOpaque to respect metavariable depth.", "pull request": "4206"}
+{"Version": "v4.9.0", "section": "Lean internals (Defeq and WHNF)", "text": "Fixes missing occurs check for delayed assignments.", "pull request": "4217"}
+{"Version": "v4.9.0", "section": "Lean internals (Definition transparency)", "text": "Adds validation for @[reducible]/@[semireducible]/@[irreducible] attributes, with local/scoped modifiers.", "pull request": "4052"}
+{"Version": "v4.9.0", "section": "Lean internals (Inductive types)", "text": "Fixes a bug where indices could be incorrectly promoted to parameters.", "pull request": "3591"}
+{"Version": "v4.9.0", "section": "Lean internals (Inductive types)", "text": "Fixes a bug in the injectivity theorem generator.", "pull request": "3398"}
+{"Version": "v4.9.0", "section": "Lean internals (Inductive types)", "text": "Fixes elaboration of mutual inductives with instance parameters.", "pull request": "4342"}
+{"Version": "v4.9.0", "section": "Lean internals (Diagnostics and profiling)", "text": "Adds option trace.profiler.useHeartbeats to measure profiler.threshold in heartbeats rather than ms.", "pull request": "3986"}
+{"Version": "v4.9.0", "section": "Lean internals (Diagnostics and profiling)", "text": "Makes set_option diagnostics true report kernel diagnostic info.", "pull request": "4082"}
+{"Version": "v4.9.0", "section": "Lean internals (Typeclass resolution)", "text": "Fixes multiple issues with TC caching interacting with synthPendingDepth, adds maxSynthPendingDepth = 1.", "pull request": "4119"}
+{"Version": "v4.9.0", "section": "Lean internals (Typeclass resolution)", "text": "Ensures local instance cache does not contain duplicates.", "pull request": "4210"}
+{"Version": "v4.9.0", "section": "Lean internals (Typeclass resolution)", "text": "Fixes handling of metavariables so that backward.synthInstance.canonInstances need not be false.", "pull request": "4216"}
+{"Version": "v4.9.0", "section": "Lean internals (Other fixes)", "text": "Fixes propagation of state for liftCoreM/liftTermElabM in Lean.Elab.Command.", "pull request": "4080"}
+{"Version": "v4.9.0", "section": "Lean internals (Other fixes)", "text": "Makes the Repr deriving handler consistent for structure vs inductive (erasing types/proofs).", "pull request": "3944"}
+{"Version": "v4.9.0", "section": "Lean internals (Other fixes)", "text": "Propagates maxHeartbeats to the kernel, controlling (kernel) deterministic timeout errors.", "pull request": "4113"}
+{"Version": "v4.9.0", "section": "Lean internals (Other fixes)", "text": "Reverts #3970 (monadic generalization of FindExpr).", "pull request": "4125"}
+{"Version": "v4.9.0", "section": "Lean internals (Other fixes)", "text": "Catches stack overflow in auto-bound implicits feature.", "pull request": "4128"}
+{"Version": "v4.9.0", "section": "Lean internals (Other fixes)", "text": "Adds tryCatchRuntimeEx combinator to replace catchRuntimeEx reader state.", "pull request": "4129"}
+{"Version": "v4.9.0", "section": "Lean internals (Other fixes)", "text": "Simplifies the expression canonicalizer.", "pull request": "4155"}
+{"Version": "v4.9.0", "section": "Lean internals (Other fixes)", "text": "Adds many missing trace classes (Elab, Tactic, etc.).", "pull request": "4151"}
+{"Version": "v4.9.0", "section": "Lean internals (Other fixes)", "text": "Adds more missing trace classes.", "pull request": "4369"}
+{"Version": "v4.9.0", "section": "Lean internals (Other fixes)", "text": "Makes congruence theorem generators clean up type annotations of argument types.", "pull request": "4185"}
+{"Version": "v4.9.0", "section": "Lean internals (Other fixes)", "text": "Fixes restoration of infotrees with auto-bound implicits, improving hovers and variable linter accuracy.", "pull request": "4192"}
+{"Version": "v4.9.0", "section": "Lean internals (Other fixes)", "text": "Fixes an issue where the interrupt exception was swallowed by some tryCatchRuntimeEx uses (merge conflict).", "pull request": "4569"}
+{"Version": "v4.9.0", "section": "Lean internals (Other fixes)", "text": "Adapts kernel interruption to the new cancellation system.", "pull request": "4584"}
+{"Version": "v4.9.0", "section": "Cleanup", "text": "Minor cleanup.", "pull request": "4112"}
+{"Version": "v4.9.0", "section": "Compiler, runtime, and FFI", "text": "Improves reset/reuse algorithm, relaxing constraints in a second pass for memory reuse.", "pull request": "4100"}
+{"Version": "v4.9.0", "section": "Compiler, runtime, and FFI", "text": "Fixes segfault in old compiler from mishandling noConfusion applications.", "pull request": "2903"}
+{"Version": "v4.9.0", "section": "Compiler, runtime, and FFI", "text": "Fixes bug in constant folding in the compiler.", "pull request": "4311"}
+{"Version": "v4.9.0", "section": "Compiler, runtime, and FFI", "text": "Documents the runtime memory layout for inductive types.", "pull request": "3915"}
+{"Version": "v4.9.0", "section": "Lake", "text": "Makes trace reading more robust, rebuilding if trace files are invalid/unreadable. Backwards-compatible with numeric traces.", "pull request": "4518"}
+{"Version": "v4.9.0", "section": "Lake", "text": "Adds support for docstrings on require commands.", "pull request": "4057"}
+{"Version": "v4.9.0", "section": "Lake", "text": "Improves hovers for family_def and library_data commands.", "pull request": "4088"}
+{"Version": "v4.9.0", "section": "Lake", "text": "Adds default README.md to package templates.", "pull request": "4147"}
+{"Version": "v4.9.0", "section": "Lake", "text": "Extends lake test help page, adds lake lint, supports specifying test/lint drivers, library test drivers, etc.", "pull request": "4261"}
+{"Version": "v4.9.0", "section": "Lake", "text": "Adds lake pack and lake unpack for archiving build artifacts.", "pull request": "4270"}
+{"Version": "v4.9.0", "section": "Lake", "text": "Switches manifest format to semantic versioning, e.g. major.minor.patch with backward compatibility for older numeric versions.", "pull request": "4083"}
+{"Version": "v4.9.0", "section": "Lake", "text": "Adds a lift from JobM to FetchM for backwards compatibility.", "pull request": "4273"}
+{"Version": "v4.9.0", "section": "Lake", "text": "Fixes performance issues when lifting LogIO to CliM.", "pull request": "4351"}
+{"Version": "v4.9.0", "section": "Lake", "text": "Makes Lake store the dependency trace in the cached build and verify it before replaying logs.", "pull request": "4343"}
+{"Version": "v4.9.0", "section": "Lake", "text": "Moves the cached log into the trace file, ensuring out-of-date logs aren't associated with up-to-date traces.", "pull request": "4402"}
+{"Version": "v4.9.0", "section": "Lake", "text": "Cleans up tests.", "pull request": "4056"}
+{"Version": "v4.9.0", "section": "Lake", "text": "Fixes noRelease test when Lean repo is tagged.", "pull request": "4244"}
+{"Version": "v4.9.0", "section": "Lake", "text": "Improves tests/serve script.", "pull request": "4346"}
+{"Version": "v4.9.0", "section": "Lake", "text": "Adds build log path to the warning for missing or invalid build log.", "pull request": "4356"}
+{"Version": "v4.9.0", "section": "DevOps", "text": "Adds a script (script/rebase-stage0.sh) for git rebase -i that updates each stage0 automatically.", "pull request": "3984"}
+{"Version": "v4.9.0", "section": "DevOps", "text": "Finishes renamings from transition to Std to Batteries.", "pull request": "4108"}
+{"Version": "v4.9.0", "section": "DevOps", "text": "Adjusts the GitHub bug template to mention testing on live.lean-lang.org.", "pull request": "4109"}
+{"Version": "v4.9.0", "section": "DevOps", "text": "Makes CI rerun only when full-ci label is added or removed.", "pull request": "4136"}
+{"Version": "v4.9.0", "section": "DevOps", "text": "Switches to #guard_msgs in tests wherever possible.", "pull request": "4175"}
+{"Version": "v4.9.0", "section": "DevOps", "text": "Explains the Lean4 pygments lexer.", "pull request": "3125"}
+{"Version": "v4.9.0", "section": "DevOps", "text": "Sets up a procedure for preparing release notes.", "pull request": "4247"}
+{"Version": "v4.9.0", "section": "DevOps", "text": "Modernizes build instructions and workflows.", "pull request": "4032"}
+{"Version": "v4.9.0", "section": "DevOps", "text": "Moves some expensive checks from merge queue to releases.", "pull request": "4255"}
+{"Version": "v4.9.0", "section": "DevOps", "text": "Adds aarch64 macOS as a native compilation target in CI.", "pull request": "4265"}
+{"Version": "v4.9.0", "section": "DevOps", "text": "Updates build instructions for macOS.", "pull request": "4317"}
+{"Version": "v4.9.0", "section": "DevOps", "text": "Adjusts workflow to update Batteries in the manifest for lean-pr-testing-NNNN branches.", "pull request": "4333"}
+{"Version": "v4.9.0", "section": "DevOps", "text": "Simplifies lean4checker step of the release checklist.", "pull request": "4355"}
+{"Version": "v4.9.0", "section": "DevOps", "text": "Adds installing elan to pr-release CI step.", "pull request": "4361"}
+{"Version": "v4.9.0", "section": "DevOps", "text": "Fixes the Windows build which was missing an exported symbol.", "pull request": "4628"}
+{"Version": "v4.9.0", "section": "Breaking changes", "text": "Now well-founded recursive functions have @[irreducible], which can break definitional-equality-based proofs.", "pull request": "4061"}
+{"Version": "v4.9.0", "section": "Breaking changes", "text": "Swaps Nat.zero_or and Nat.or_zero.", "pull request": "4094"}
+{"Version": "v4.9.0", "section": "Breaking changes", "text": "Renames IsLawfulSingleton to LawfulSingleton.", "pull request": "4350"}
+{"Version": "v4.9.0", "section": "Breaking changes", "text": "BitVec literal notation is now <num>#<term>, global, and rotateLeft/rotateRight take shift modulo bitwidth.", "pull request": "4229"}
+{"Version": "v4.9.0", "section": "Breaking changes", "text": "No longer simp lemmas: List.length_pos and Option.bind_eq_some.", "pull request": "4172 / 4314"}
+{"Version": "v4.9.0", "section": "Breaking changes", "text": "Due to #3929, MessageData.ofPPFormat is removed; use MessageData.lazy or .ofFormatWithInfos.", "pull request": "3929"}
+{"Version": "v4.9.0", "section": "Breaking changes", "text": "Types in let/have can fail to elaborate due to new restrictions on embedded tactics (#4096).", "pull request": "4096"}