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v4.8.0 | DevOps | Tweaks or merges #3834 improvements for standard library CI. | 3834 |
v4.8.0 | DevOps | Applies #3923 changes for mathlib CI or general project CI improvements. | 3923 |
v4.8.0 | DevOps | Fixes nix build . on macOS (#3712). | 3712 |
v4.8.0 | DevOps | Replaces shell.nix with flake.nix in devShell (#3717). | 3717 |
v4.8.0 | DevOps | Adds test result summaries after certain runs (#3715). | 3715 |
v4.8.0 | DevOps | Prevents stage0 changes from merging without proper checks (#3971). | 3971 |
v4.8.0 | DevOps | Adds handling for changes-stage0 label in the merge queue (#3979). | 3979 |
v4.8.0 | DevOps | Adds a script to summarize GitHub issues (#3952). | 3952 |
v4.8.0 | Breaking changes | Large Lake build refactor changes output format and certain Lake APIs. | 3601 |
v4.8.0 | Breaking changes | Executables with supportInterpreter on Windows must run via lake exe to find DLLs. | 3601 |
v4.8.0 | Breaking changes | Equational theorems renamed from ._eq_<idx> to .eq_<idx>, and ._unfold to .eq_def. | 3661 |
v4.7.0 | Language features | Simp and rw skip instance resynthesis by default; revert with `set_option tactic.skipAssignedInstances false`. | 3507 |
v4.7.0 | Language features | Simp and rw skip instance resynthesis by default; revert with `set_option tactic.skipAssignedInstances false`. | 3509 |
v4.7.0 | Pretty printing | When `pp.proofs = false`, omitted proofs now display as `⋯` instead of `_`. | 3241 |
v4.7.0 | Pretty printing | pp.proofs.withType is now false by default. | none |
v4.7.0 | Pretty printing | App delaborator handles over-application so extra-arg cases in app_unexpanders are unnecessary. | 3495 |
v4.7.0 | Simp/dsimp config | Adds `zetaDelta` option (false by default); see #2682 for details on zeta vs zetaDelta. | 2682 |
v4.7.0 | Simp local theorems | Local theorems for simp assume function arguments are `no_index`, restoring Lean 3 behavior. | 2670 |
v4.7.0 | Tactics | Improved error messages for `decide` tactic. | 3422 |
v4.7.0 | IDE/Performance | Improved auto-completion performance. | 3460 |
v4.7.0 | IDE/Performance | Faster initial language server startup. | 3552 |
v4.7.0 | IDE/Call hierarchy | Sort entries and remove private header from displayed names in call hierarchy. | 3482 |
v4.7.0 | Parsing | Added a low-level error recovery combinator for DSLs. | 3413 |
v4.7.0 | Termination inference | `termination_by?` reveals inferred argument and can convert to `termination_by` via code action. | 3514 |
v4.7.0 | Arithmetic ops | `/` and `%` on `Int` now use `Int.ediv` and `Int.emod`, with kernel support. (Change for non-Std users.) | 3376 |
v4.7.0 | omega tactic | Now in core; supplemented by `bv_omega` for BitVec linear arithmetic. | 3435 |
v4.7.0 | omega tactic | Supports `Fin` type. | 3427 |
v4.7.0 | omega tactic | Supports `<<<` operator. | 3433 |
v4.7.0 | omega tactic | No longer identifies atoms up to definitional equality; can't prove `id x ≤ x` automatically. | 3525 |
v4.7.0 | omega tactic | Used in Lean's automation for termination proofs. | 3503 |
v4.7.0 | omega tactic | Used in array indexing proofs. | 3515 |
v4.7.0 | Library search tactics | `exact?`/`apply?`/`solve_by_elim` from Std are now in core Lean. | none |
v4.7.0 | Tactic commands | New `#check_tactic` and `#check_simp` for verifying tactic behavior. | none |
v4.7.0 | App unexpanders | Delaborator tries unexpanders on every prefix, registering TermInfo properly for subexpressions. | 3375 |
v4.7.0 | Breaking changes | Stronger `MonadAlwaysExcept` requirement for `Lean.withTraceNode` and variants. | none |
v4.7.0 | Breaking changes | `match ... with.` replaced by `nomatch` syntax from Std. | 3279 |
v4.7.0 | Breaking changes | `fun.` replaced by `nofun` syntax from Std. | 3286 |
v4.7.0 | simp bugfixes | Avoid crash when `simp` loops indefinitely. | 3269 |
v4.7.0 | simp bugfixes | `simp` no longer gets stuck on autoParam premises. | 3315 |
v4.7.0 | simp bugfixes | `simp` doesn't fail when a custom discharger makes no progress. | 3317 |
v4.7.0 | simp bugfixes | `simp` can now discharge autoParam premises reduced to True. | 3314 |
v4.7.0 | simp bugfixes | `simp?` suggests generated equation lemma names (part 1). | 3547 |
v4.7.0 | simp bugfixes | `simp?` suggests generated equation lemma names (part 2). | 3573 |
v4.7.0 | match expressions | Fix regression with builtin literals in match. | 3521 |
v4.7.0 | match expressions | Accept match over BitVec finite types. | 3538 |
v4.7.0 | match expressions | Fix matching on Int literals. | 3504 |
v4.7.0 | match expressions | Allow patterns containing int values/constructors in match. | 3496 |
v4.7.0 | termination_by | Improved error messages for `termination_by` usage. | 3255 |
v4.7.0 | rename_i fix | Fix rename_i in macros (part 1). | 3553 |
v4.7.0 | rename_i fix | Fix rename_i in macros (part 2). | 3581 |
v4.7.0 | generalize tactic | Fix excessive resource usage in `generalize` (part 1). | 3524 |
v4.7.0 | generalize tactic | Fix excessive resource usage in `generalize` (part 2). | 3575 |
v4.7.0 | equation lemma | AutoParam arguments fail to rewrite (part 1). | 2243 |
v4.7.0 | equation lemma | AutoParam arguments fail to rewrite (part 2). | 3316 |
v4.7.0 | add_decl_doc | `add_decl_doc` now checks that declarations are local. | 3311 |
v4.7.0 | inductives fix | Instantiate types of inductives with correct parameters (part 1). | 3242 |
v4.7.0 | inductives fix | Instantiate types of inductives with correct parameters (part 2). | 3246 |
v4.7.0 | simprocs | New simprocs for many basic types. | 3407 |
v4.7.0 | Lake fixes | Warn on cloud release fetch failures. | 3401 |
v4.7.0 | Lake fixes | Handle trace & `lake build :release` errors better. | 3248 |
v4.6.1 | Performance | Backport of #3552 fixing a performance regression in server startup. | 3552 |
v4.6.0 | Simp | Added custom simplification procedures (simprocs) to `simp`, controllable via `set_option simprocs false` or by specifying them in `simp` commands. | none |
v4.6.0 | Termination hints | Overhauled `termination_by` and `decreasing_by` syntax and placement, removing function names and placing them next to their respective definitions. | none |
v4.6.0 | Termination hints | Changed semantics of `decreasing_by` so the tactic is applied to all termination proof goals together. | none |
v4.6.0 | InfoTree.context | Modified to allow partial contexts during command elaboration, breaking some manual InfoTree traversals. | 3159 |
v4.6.0 | Language server | Added call hierarchy support; requires a full rebuild for new .ilean format. | 3082 |
v4.6.0 | Structure instances | Multiple sources are filled strictly left-to-right, avoiding unnecessary eta expansion and reducing CPU usage. | 2478 |
v4.6.0 | Structure instances | RFC discussion for the new structure instance elaborator approach. | 2451 |
v4.6.0 | Pretty printing | Added `pp.deepTerms` and `pp.deepTerms.threshold` to omit printing deeply nested terms. | 3201 |
v4.6.0 | Pretty printing | Added `pp.numeralTypes` and `pp.natLit` options to show type ascriptions on number literals or print them as `nat_lit`. | 2933 |
v4.6.0 | Pretty printing | Further discussion about numeral printing conventions. | 3021 |
v4.6.0 | Lake | Improved platform information and control. | 3226 |
v4.6.0 | Lake | Allowed `lake update` from unsupported manifest versions. | 3149 |
v4.6.0 | Other improvements | `intro` now aware of `let_fun`. | 3115 |
v4.6.0 | Other improvements | Produce simpler proof terms in `rw` tactic. | 3121 |
v4.6.0 | Other improvements | Fuse nested `mkCongrArg` calls in `simp` proofs. | 3203 |
v4.6.0 | Other improvements | `induction using` now supports a general term. | 3188 |
v4.6.0 | Other improvements | Allow generalization in `let`; fixes #3065. | 3060 |
v4.6.0 | Other improvements | Out-of-bounds `swap!` returns `a`, not `default`; fixes #3196. | 3197 |
v4.6.0 | Other improvements | Derive `BEq` on structures with `Prop` fields; fixes #3140. | 3191 |
v4.6.0 | Other improvements | Refine through more `casesOnApp`/`matcherApp`; fixes #3175. | 3176 |
v4.6.0 | Other improvements | Do not strip dotted components from module names; fixes #2999. | 2994 |
v4.6.0 | Other improvements | Fix `deriving` only applying to the first declaration; fixes #3057. | 3058 |
v4.6.0 | Other improvements | Prevent metavariable instantiation for disallowed occurrences in kabstract/rw; fixes #2538. | 2539 |
v4.6.0 | Other improvements | Hover info for `cases h : ...` constructs. | 3084 |
v4.5.0 | String syntax | Modify lexical syntax of string literals to have string gaps, allowing multi-line strings without extra whitespace. | 2821 |
v4.5.0 | String syntax | Discussion of string-gap design and motivation in RFC #2838. | 2838 |
v4.5.0 | String syntax | Add raw string literal syntax: `r"..."` with optional `#` for quoting double quotes inside. | 2929 |
v4.5.0 | String syntax | Issue tracking raw string literal request and design details. | 1422 |
v4.5.0 | Termination | Removed `termination_by'`; use `termination_by` or `WellFounded.wrap` as alternatives. | none |
v4.5.0 | LSP | Support snippet edits in `TextEdit`s (see `Lean.Lsp.SnippetString`) for advanced code actions. | none |
v4.5.0 | Widget API | UserWidgetDefinition→Widget.Module; see `@[widget_module]`. Also adds `show_panel_widgets` and `RpcEncodable` props in infotree. | 2963 |
v4.5.0 | Termination inference | If no lexicographic measure is found, an explanation is given to help with debugging. | 2960 |
v4.5.0 | Termination inference | `set_option showInferredTerminationBy true` prints auto-generated `termination_by` clauses. | 3012 |
v4.5.0 | Mutual blocks | More detailed errors for invalid mutual recursion blocks. | 2949 |
v4.5.0 | simp? | Improvements to the output of `simp?` and `simp_all?` (first set). | 2923 |
v4.5.0 | simp? | Further improvements to `simp?` and `simp_all?` (second set). | 2969 |
v4.5.0 | Tactics | Tactics using `withLocation *` no longer fail if they close the main goal. | 2917 |
v4.5.0 | Extern testing | New `test_extern` command for testing `@[extern]` or `@[implemented_by]` functions. | none |
v4.5.0 | Bug fixes | Fixes for issues #2853, #2953, #2966, #2971, #2990, #3094. | none |
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