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v4.9.0 | Incrementality | Adds incrementality support for next and if tactics. | 4459 |
v4.9.0 | Incrementality | Disables incrementality for tactics-in-terms-in-tactics. | 4554 |
v4.9.0 | Language features, tactics, and metaprograms | Ensures that the names used for functional induction are reserved. | 4135 |
v4.9.0 | Language features, tactics, and metaprograms | Adds support for structural recursion on reflexive types (example: Many α). | 4327 |
v4.9.0 | Language features, tactics, and metaprograms | Normalizes all line endings to LF before processing, making Lean insensitive to CRLF vs LF. | 3903 |
v4.9.0 | Language features, tactics, and metaprograms | Makes the tactic framework able to recover from runtime errors like deterministic timeouts or max recursion depth. | 4130 |
v4.9.0 | split tactic | Fixes split at h when h has forward dependencies. | 4211 |
v4.9.0 | split tactic | Allows split for if-expressions to work on non-propositional goals. | 4349 |
v4.9.0 | apply tactic | Improves error messages by displaying implicit arguments in unification errors as needed (MessageData changes). | 3929 |
v4.9.0 | cases tactic | Adds support for unifying large offsets like x + 20000 = 20001. | 4224 |
v4.9.0 | omega tactic | Lets omega fall back to classical Decidable instances for contradiction proofs. | 4073 |
v4.9.0 | omega tactic | Fixes a bug in omega tactic. | 4141 |
v4.9.0 | omega tactic | Fixes another bug in omega tactic. | 4184 |
v4.9.0 | omega tactic | Improves the error message if no facts are found in the local context. | 4264 |
v4.9.0 | omega tactic | Improves expression matching by using match_expr. | 4358 |
v4.9.0 | simp tactic | Makes names of erased lemmas clickable. | 4176 |
v4.9.0 | simp tactic | Adds a pretty printer for discrimination tree keys. | 4208 |
v4.9.0 | simp tactic | Adds Simp.Config.index option to control discrimination tree usage, with diagnostics for 'bad keys'. | 4202 |
v4.9.0 | simp tactic | Prevents internal match equational theorems from appearing in simp trace. | 4274 |
v4.9.0 | simp tactic | Continues the simp process even if a lemma fails to elaborate, in recovery mode. | 4177 |
v4.9.0 | simp tactic | Continues the simp process even if a lemma fails to elaborate, in recovery mode. | 4359 |
v4.9.0 | simp tactic | Fixes panic when applying @[simp] to malformed theorem syntax. | 4341 |
v4.9.0 | simp tactic | Prevents simp from using the forward version of user-specified backward theorems. | 4345 |
v4.9.0 | simp tactic | Adds missing dsimp simplifications for fixed parameters in generated congruence theorems. | 4352 |
v4.9.0 | simp tactic | Improves trace messages for simp so constants are hoverable. | 4362 |
v4.9.0 | Elaboration | Makes subst notation (he ▸ h) try rewriting in both directions even with no expected type. | 4046 |
v4.9.0 | Elaboration | Adds support for identifiers in autoparams, e.g. (h : x = y := by exact rfl). | 3328 |
v4.9.0 | Elaboration | Changes how the type in let/have is elaborated, requiring tactics in the type to be fully evaluated first. | 4096 |
v4.9.0 | Elaboration | Ensures expression tree elaborator commits to the computed "max type" for arithmetic expressions. | 4215 |
v4.9.0 | Elaboration | Shows signature elaboration errors even if parse errors exist in the body. | 4267 |
v4.9.0 | Elaboration | Improves error messages when numeric literals fail to synthesize OfNat, including warnings about proposition types. | 4368 |
v4.9.0 | Elaboration | Fixes nested error messages/infotrees vanishing (snapshot subtrees not restored). | 4643 |
v4.9.0 | Elaboration | Calculates error suppression per snapshot, letting elaboration errors appear even if there are later parse errors. | 4657 |
v4.9.0 | Metaprogramming | Adds Lean.MVarId.revertAll to revert all free variables. | 4167 |
v4.9.0 | Metaprogramming | Adds Lean.MVarId.ensureNoMVar to ensure the goal's target has no expression metavariables. | 4169 |
v4.9.0 | Metaprogramming | Adds cleanupAnnotations parameter to forallTelescope methods. | 4180 |
v4.9.0 | Metaprogramming | Adds support for parser aliases in syntax quotations. | 4307 |
v4.9.0 | Work toward implementing grind tactic | Adds grind_norm and grind_norm_proc attributes and @[grind_norm] theorems. | 4164 |
v4.9.0 | Work toward implementing grind tactic | Creates grind preprocessor and core module. | 4170 |
v4.9.0 | Work toward implementing grind tactic | Adds special cases tactic to grind along with @[grind_cases]. | 4235 |
v4.9.0 | Work toward implementing grind tactic | Adds special injection? tactic to grind. | 4243 |
v4.9.0 | Other fixes or improvements | Fixes a bug in Nat.reduceLeDiff simproc. | 4065 |
v4.9.0 | Other fixes or improvements | Makes deprecation warnings activate even for generalized field notation. | 3969 |
v4.9.0 | Other fixes or improvements | Fixes sorry so that it does not activate the implicit lambda feature. | 4132 |
v4.9.0 | Other fixes or improvements | Fixes the case tactic so it can be used in macros, erasing macro scopes from the tag. | 4252 |
v4.9.0 | Other fixes or improvements | Fixes bugs in partial calc tactic when there is mdata or metavariables. | 4335 |
v4.9.0 | Other fixes or improvements | Makes termination_by? report each unused parameter as _. | 4329 |
v4.9.0 | Language server, widgets, and IDE extensions | Fixes 'Find References' when browsing core Lean sources. | 4066 |
v4.9.0 | Language server, widgets, and IDE extensions | Allows embedding user widgets in structured messages (companion PR in vscode-lean4#449). | 4254 |
v4.9.0 | Language server, widgets, and IDE extensions | Makes watchdog more resilient against badly behaving clients. | 4445 |
v4.9.0 | Library | Upstreams many List and Array operations and theorems from Batteries. | 4059 |
v4.9.0 | Library | Removes the unused Inhabited instance for Subtype. | 4055 |
v4.9.0 | Library | Adds dates in existing @[deprecated] attributes. | 3967 |
v4.9.0 | Library | Adds boilerplate Char, UInt, and Fin theorems. | 4231 |
v4.9.0 | Library | Fixes the MonadStore type classes to use semiOutParam. | 4205 |
v4.9.0 | Library | Renames IsLawfulSingleton to LawfulSingleton. | 4350 |
v4.9.0 | Nat | Swaps Nat.zero_or and Nat.or_zero. | 4094 |
v4.9.0 | Nat | Changes definition of Nat.mod so n % (m + n) reduces when n is a literal without well-founded recursion. | 4098 |
v4.9.0 | Nat | Changes definition of Nat.mod to avoid well-founded recursion becoming irreducible by default. | 4145 |
v4.9.0 | Nat | Redefines Nat.testBit to be more performant. | 4188 |
v4.9.0 | Nat | Adds theorems for Nat. | 4199 |
v4.9.0 | Array | Improves functional induction principle Array.feraseIdx.induct. | 4074 |
v4.9.0 | List | Removes @[simp] from List.length_pos. | 4172 |
v4.9.0 | Option | Adds theorems to simplify Option-valued dependent if-then-else. | 4037 |
v4.9.0 | Option | Removes @[simp] from Option.bind_eq_some. | 4314 |
v4.9.0 | BitVec | Adds theorems for BitVec. | 4095 |
v4.9.0 | BitVec | Adds simprocs for reducing x >>> i and x <<< i when i is a bitvector literal. | 4193 |
v4.9.0 | BitVec | Adds simprocs for reducing repeated shifts (x <<< i) <<< j and (x >>> i) >>> j. | 4194 |
v4.9.0 | BitVec | Redefines rotateLeft/rotateRight to use modulo reduction of the shift offset. | 4229 |
v4.9.0 | BitVec | Makes <num>#<term> bitvector literal notation global, removing <term>#<term> form. | 0d3051 (commit) |
v4.9.0 | HashMap | Fixes implicitness of typeclass arguments in HashMap.ofList. | 4248 |
v4.9.0 | IO | Adds IO.Process.getCurrentDir and IO.Process.setCurrentDir for adjusting current working directory. | 4036 |
v4.9.0 | Cleanup | Minor cleanup. | 4077 |
v4.9.0 | Lean internals (Defeq and WHNF) | Removes unnecessary checkpointDefEq. | 4029 |
v4.9.0 | Lean internals (Defeq and WHNF) | Fixes isReadOnlyOrSyntheticOpaque to respect metavariable depth. | 4206 |
v4.9.0 | Lean internals (Defeq and WHNF) | Fixes missing occurs check for delayed assignments. | 4217 |
v4.9.0 | Lean internals (Definition transparency) | Adds validation for @[reducible]/@[semireducible]/@[irreducible] attributes, with local/scoped modifiers. | 4052 |
v4.9.0 | Lean internals (Inductive types) | Fixes a bug where indices could be incorrectly promoted to parameters. | 3591 |
v4.9.0 | Lean internals (Inductive types) | Fixes a bug in the injectivity theorem generator. | 3398 |
v4.9.0 | Lean internals (Inductive types) | Fixes elaboration of mutual inductives with instance parameters. | 4342 |
v4.9.0 | Lean internals (Diagnostics and profiling) | Adds option trace.profiler.useHeartbeats to measure profiler.threshold in heartbeats rather than ms. | 3986 |
v4.9.0 | Lean internals (Diagnostics and profiling) | Makes set_option diagnostics true report kernel diagnostic info. | 4082 |
v4.9.0 | Lean internals (Typeclass resolution) | Fixes multiple issues with TC caching interacting with synthPendingDepth, adds maxSynthPendingDepth = 1. | 4119 |
v4.9.0 | Lean internals (Typeclass resolution) | Ensures local instance cache does not contain duplicates. | 4210 |
v4.9.0 | Lean internals (Typeclass resolution) | Fixes handling of metavariables so that backward.synthInstance.canonInstances need not be false. | 4216 |
v4.9.0 | Lean internals (Other fixes) | Fixes propagation of state for liftCoreM/liftTermElabM in Lean.Elab.Command. | 4080 |
v4.9.0 | Lean internals (Other fixes) | Makes the Repr deriving handler consistent for structure vs inductive (erasing types/proofs). | 3944 |
v4.9.0 | Lean internals (Other fixes) | Propagates maxHeartbeats to the kernel, controlling (kernel) deterministic timeout errors. | 4113 |
v4.9.0 | Lean internals (Other fixes) | Reverts #3970 (monadic generalization of FindExpr). | 4125 |
v4.9.0 | Lean internals (Other fixes) | Catches stack overflow in auto-bound implicits feature. | 4128 |
v4.9.0 | Lean internals (Other fixes) | Adds tryCatchRuntimeEx combinator to replace catchRuntimeEx reader state. | 4129 |
v4.9.0 | Lean internals (Other fixes) | Simplifies the expression canonicalizer. | 4155 |
v4.9.0 | Lean internals (Other fixes) | Adds many missing trace classes (Elab, Tactic, etc.). | 4151 |
v4.9.0 | Lean internals (Other fixes) | Adds more missing trace classes. | 4369 |
v4.9.0 | Lean internals (Other fixes) | Makes congruence theorem generators clean up type annotations of argument types. | 4185 |
v4.9.0 | Lean internals (Other fixes) | Fixes restoration of infotrees with auto-bound implicits, improving hovers and variable linter accuracy. | 4192 |
v4.9.0 | Lean internals (Other fixes) | Fixes an issue where the interrupt exception was swallowed by some tryCatchRuntimeEx uses (merge conflict). | 4569 |
v4.9.0 | Lean internals (Other fixes) | Adapts kernel interruption to the new cancellation system. | 4584 |
v4.9.0 | Cleanup | Minor cleanup. | 4112 |
v4.9.0 | Compiler, runtime, and FFI | Improves reset/reuse algorithm, relaxing constraints in a second pass for memory reuse. | 4100 |
Subsets and Splits