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|---|---|---|---|
v4.5.0 | Bug fixes | Fixed eager evaluation in `Option.getD` (#3043), prevented panic in `leanPosToLspPos` (#3071), improved short-circuit for `List.all/any` (#2972). | none |
v4.5.0 | Lake bug fixes | Addressed issues #3036, #3064, #3069 in Lake. | none |
v4.4.0 | Lake/server options | Per-package server options (`leanOptions`/`moreServerOptions`); `moreServerArgs`→`moreGlobalServerArgs` deprecated. | 2858 |
v4.4.0 | Language server | Implemented rename request handler (LSP). | 2462 |
v4.4.0 | Language server | Import auto-completion feature. | 2904 |
v4.4.0 | Pretty printing | Added `pp.beta` to apply beta reduction in pretty printing. | 2864 |
v4.4.0 | Compiler | Embed and check githash in .olean for build verification. | 2766 |
v4.4.0 | Termination inference | Guess lexicographic order for well-founded recursion automatically. | 2874 |
v4.4.0 | Syntax | Allow trailing commas in tuples, lists, and tactics. | 2643 |
v4.4.0 | Bug fixes | Fixes #2628, #2883, #2810, #2925, #2914 in core or server code. | none |
v4.4.0 | Lake | Update package creation: `lake init .` uses current dir name, disallows invalid pkg names, no uppercase conversion for `lean_lib`, supports non-ident libs, filters irrelevant env extensions, re-unpacks cloud releases, simpler math template, parse build targets in `lake exe`, shadowing for later packages, excludes exe roots from importable modules. | 2890 |
v4.4.0 | Lake | Disallow invalid package names (#2637). | 2637 |
v4.4.0 | Lake | No uppercase conversion for `lean_lib` (#2567). | 2567 |
v4.4.0 | Lake | Support non-identifier library names (#2865). | 2865 |
v4.4.0 | Lake | Filter irrelevant env extensions (#2632). | 2632 |
v4.4.0 | Lake | Re-unpack cloud releases if build dir is removed (#2928). | 2928 |
v4.4.0 | Lake | Simplified math template (#2930). | 2930 |
v4.4.0 | Lake | Parse build target in `lake exe` (#2932). | 2932 |
v4.4.0 | Lake | Shadow later packages over earlier ones (#2937). | 2937 |
v4.3.0 | Simp tactic | `simp [f]` no longer unfolds partial applications of `f` by default (#2042). Use `unfold f` or `simp (config := { unfoldPartialApp := true }) [f]`. | 2042 |
v4.3.0 | Simp tactic | Does not use `Decidable` rewriting unless `decide := true` is set in config. (`simp` won't close all decidable goals). | none |
v4.3.0 | Bug fixes | Addresses #2778, #2790, #2552, #1926, #2669, #2281, #2711, #2685, #2514, #2729, #2361, #2178. Also cancels tasks on doc edit (#2648), removes extra `%` from `Fin.mod` (#2688), avoids DecidableEq in `Array.mem` (#2774), unifies `USize.size` (#1926), better emacs eglot (#2721). | none |
v4.3.0 | Lake | Sensible defaults for `lake new MyProject math` (#2770), replaced `postUpdate?` with `post_update` (#185), auto-create manifest (#2680), deprecated `:=` syntax in config, `LAKE_PKG_URL_MAP` for overriding URLs (#2709), moved outputs to `.lake` (#2713), updated manifest to v7 (#2801), stricter `lakefile.olean` checks (#2842). | 2770 |
v4.3.0 | Lake | Replace `postUpdate?` with `post_update` (#185). | 185 |
v4.3.0 | Lake | Auto-create manifest if missing (#2680). | 2680 |
v4.3.0 | Lake | Override package URLs with `LAKE_PKG_URL_MAP` (#2709). | 2709 |
v4.3.0 | Lake | Move outputs to `.lake` (#2713). | 2713 |
v4.3.0 | Lake | Updated manifest format to version 7 (#2801). | 2801 |
v4.3.0 | Lake | Stricter checks on `lakefile.olean` (#2842). | 2842 |
v4.2.0 | isDefEq | Cache for terms not containing metavariables (#2644). | 2644 |
v4.2.0 | Kernel/Environment | Made `Environment.mk`/`Environment.add` private; safer `replay` method (#2604). | 2604 |
v4.2.0 | Kernel/Environment | Follow-up environment changes for add (#2642) and replay (#2617). | 2642 |
v4.2.0 | Kernel/Environment | Also reference #2617 (replay) for safe environment modifications. | 2617 |
v4.2.0 | IO.Process | `IO.Process.output` no longer inherits stdin of the caller. | none |
v4.2.0 | Performance | Do not inhibit caching of default-level match reduction (#2612). | 2612 |
v4.2.0 | Error messages | List valid case tags on invalid input (#2629). | 2629 |
v4.2.0 | Derive handlers | Support `DecidableEq` on mutual inductives (#2591). | 2591 |
v4.2.0 | Lake | Show path of failed import (#2616), fix macOS linker warnings (#2598), add `postUpdate?` config, improve startup (#2572, #2573). | 2616 |
v4.2.0 | Lake | Fix macOS linker warnings (#2598). | 2598 |
v4.2.0 | Lake | Improved startup time (#2572). | 2572 |
v4.2.0 | Lake | Further improvement to startup (#2573). | 2573 |
v4.2.0 | Tactics | `refine e` only yields newly-created metavars, preventing duplicated or closed goals (#2502). | 2502 |
v4.1.0 | Error messages | Improve positioning on missing tokens in incomplete tactic proofs (#2393). | 2393 |
v4.1.0 | Lake OLean cache | Lake caches `lakefile.lean` in `lakefile.olean`; use `-R/--reconfigure` if config changed. | none |
v4.1.0 | Lake buildO | Signature changed: args→weakArgs/traceArgs separation. | none |
v4.1.0 | Imports | Use `Array Import` in `importModules`, `headerToImports`, `parseImports` (#2480). | 2480 |
v4.1.0 | Rewrite config | `occs` field in `Rewrite.Config` for controlling pattern occurrences (#2470). | 2470 |
v4.0.0 | Meta API | Renamed `Lean.Meta.getConst?` to `getUnfoldableConst?` and `getConstNoEx?` to `getUnfoldableConstNoEx?`. Use `Lean.getConstInfo` instead for public API. | 2454 |
v4.0.0 | simp/dsimp | `dsimp / simp / simp_all` now fail by default if they make no progress. Use `(config := { failIfUnchanged := false })` to override. | 2336 |
v4.0.0 | simp_all | `simp_all` now preserves hypothesis order more consistently. This may affect tactics that rely on ordering (rename_i, case, next). | 2334 |
v4.0.0 | have this | `this` is now a regular identifier introduced by `have :=` in the current tactic block. Previously it was a keyword visible in all scopes. | 2247 |
v4.0.0 | Profiling | Show typeclass and tactic names in profiler output. | 2170 |
v4.0.0 | calc indentation | `calc` requires consistent indentation for relation/proof pairs. Also supports underscores `_` in the first relation. | 1844 |
v4.0.0 | Lake | Update Lake to latest prerelease version. | none |
v4.0.0 | IDE/LS | Go-to-definition on typeclass projection applications goes to the instance(s). | 1767 |
v4.0.0 | Profiling | Include timings in trace messages when `profiler = true`. | 1995 |
v4.0.0 | Hover/#check | Pretty-print signatures in hover and `#check <ident>` results. | 1943 |
v4.0.0 | Parser | Introduce parser memoization to avoid exponential behavior in ambiguous grammars. | 1799 |
v4.0.0 | Syntax expansions | Allow `doSeq` in `let x <- e | seq` pattern (partial/do-block scenario). | 1809 |
v4.0.0 | IDE/LS | Hover/go-to-def/refs for options (e.g. set_option). | 1783 |
v4.0.0 | Syntax | Add empty type ascription `(e :)` to indicate expression type is not yet known. | 1797 |
v4.0.0 | Parser | Make tokens in `<|>` relevant to syntax match (fix parse ambiguities). | 1744 |
v4.0.0 | Linter | Add `linter.deprecated` option to silence deprecation warnings. | 1768 |
v4.0.0 | Auto-completion | Improve fuzzy-matching heuristics for completions. | 1710 |
v4.0.0 | Implementation-detail hypotheses | Support hidden/implementation-only hypotheses that appear in tactic proofs for internal usage. | 1692 |
v4.0.0 | cases/induction | Hover info for `cases` or `induction` case names, referencing pattern variables. | 1660 |
v4.0.0 | Parser | Prefer longer parse branch even if unsuccessful, for better error messages in ambiguous contexts. | 1658 |
v4.0.0 | Hover info | Show the declaration module name in hover text. | 1638 |
v4.0.0 | conv mode | New `conv` structuring tactics for advanced rewriting. | 1636 |
v4.0.0 | simp trace | `simp` can track steps and print an equivalent `simp only` set. Useful for debugging. (Simp steps recorded.) | 1626 |
v4.0.0 | Indentation | Uniform indentation required in tactic blocks/do blocks. (Issue #1606 references.) | none |
v4.0.0 | AssocList/HashMap/RBMap | Moved these data structures into Lean package. Standard library (std4) will evolve them independently. | none |
v4.0.0 | std4 library | Std library moved to separate std4 repository on GitHub. | none |
v4.0.0 | InteractiveGoals | `InteractiveGoals` now includes info about changed parts of a goal after applying a tactic. | 1610 |
v4.0.0 | Docstrings | Add `[inheritDoc]` attribute for reusing docstrings across declarations. | 1480 |
v4.0.0 | panic behavior | Expose that `panic = default` in more contexts (lower-level improvements). | 1614 |
v4.0.0 | LCNF codegen | New code generator project in `src/Lean/Compiler/LCNF` has started. | none |
v4.0.0 | register_simp_attr | Remove optional description parameter from `register_simp_attr` command. | 1566 |
v4.0.0 | Concurrency | Additional concurrency primitives (futures, channels, etc.). | 1555 |
v4.0.0 | Traces | Support collapsible traces with messages for improved debugging views. | 1448 |
v4.0.0 | Namespaces | Hygienic resolution of namespaces in macros and expansions. | 1442 |
v4.0.0 | Float | New `Float` functions for arithmetic or conversions. | 1460 |
v4.0.0 | Init docstrings | Added many new docstrings to declarations in `Init`. | none |
v4.0.0-m5 | Lake | Update Lake to v4.0.0. See Lake's v4.0.0 release notes for changes. | none |
v4.0.0-m5 | Mutual declarations | Support mutual declarations in different namespaces. The compiler auto-creates a common prefix namespace. | none |
v4.0.0-m5 | deriving handlers | Allow user-defined deriving handlers for existing typeclasses. See `tests/pkg/deriving/UserDeriving` for example. | none |
v4.0.0-m5 | Tactics | Add `congr (num)?`. This tactic helps prove equality by structural decomposition of function arguments. | none |
v4.0.0-m5 | Lint | Missing doc linter for declarations lacking docstrings (#1390). | 1390 |
v4.0.0-m5 | match syntax | Check for unused alternatives in `match`. (#1371). | 1371 |
v4.0.0-m5 | Completion | Auto-completion for structure instance fields and dotted identifier notation (#123?). | none |
v4.0.0-m5 | nat_lit | No longer needed for `OfNat` instances. E.g., `instance : OfNat Bit 0` is valid. | 1389 |
v4.0.0-m5 | Attributes | Add `[elabAsElim]` to mimic Lean 3's `elab_as_eliminator` for custom induction usage. | none |
v4.0.0-m5 | Trans class | `Trans` now accepts relations in `Type u`, enabling more flexible rewriting in calc expressions. | none |
v4.0.0-m5 | Constructors | Allow unescaped keywords as inductive constructor names, using dot notation to avoid conflicts. | none |
v4.0.0-m5 | Local instance check | Error if parametric local instances are not forward-dependent, can disable via `set_option checkBinderAnnotations false`. | none |
v4.0.0-m5 | pp.showLetValues | New option to hide let-binders' RHS in goals. Defaults to `true` in tactic-mode, `false` otherwise. | 1345 |
v4.0.0-m5 | warningAsError | Option `warningAsError` treats warnings as errors at elaboration time. | none |
v4.0.0-m5 | Patterns | Support dotted notation and named arguments in match/pattern syntax, e.g. `.forallE (binderType := type) .. => type`. | none |
v4.0.0-m5 | Attributes references | Go-to-definition for references in attributes like `@[implementedBy func]`, `@[tactic parserName]`, etc. | 1350 |
v4.0.0-m5 | MVarId discoverability | Add easier-to-find MVarId methods, deprecate older ones. (#1346 references further improvements). | 1346 |
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