Version
stringclasses 20
values | section
stringclasses 275
values | text
stringlengths 14
1.01k
| pull request
stringlengths 3
15
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|---|---|---|---|
v4.0.0-m5
|
deprecated attribute
|
Mark declarations with `[deprecated]`. Warnings suggest the recommended replacement if given.
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none
|
v4.0.0-m5
|
LevelMVarId
|
New type `LevelMVarId` (aka `LMVarId`) for universe metavars, preventing confusion with expr metavars.
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none
|
v4.0.0-m5
|
calc improvements
|
Improvements to the `calc` syntax and tactics (issue #1342 references).
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1342
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v4.0.0-m5
|
Parser antiquotations
|
Relaxed parsing further reduces need for explicit `$x:p` in macros.
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1272
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v4.0.0-m5
|
Computed fields
|
Inductives can define `[computedField]` for constant-time field access (values stored in constructor).
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none
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v4.0.0-m5
|
GetElem notation
|
`a[i]` is now `getElem a i (by get_elem_tactic)`. Also introduced `a[i]!` and `a[i]?` for panic/Option indexing.
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none
|
v4.0.0-m5
|
Qualified recursion
|
Better support for qualified names in recursive declarations, e.g. `Nat.fact` inside a `namespace Nat` block.
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none
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v4.0.0-m5
|
#eval CommandElabM
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`#eval` supports `CommandElabM` monad for on-the-fly commands in user code.
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none
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v4.0.0-m5
|
do-notation
|
Try elaborating do-blocks even if the expected type is unknown, allowing `#eval do IO.println ...` forms.
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none
|
v4.0.0-m5
|
Linux backtrace
|
Panics on Linux print a backtrace by default. Disable via `LEAN_BACKTRACE=0`.
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none
|
v4.0.0-m5
|
Parser grouping
|
Auto-insert `group(·)` where needed in `(...)+` combinators to avoid grammar conflicts.
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none
|
v4.0.0-m5
|
Typed Macros
|
Syntax antiquotations track syntax kinds, reducing ill-formed expansions. (#1251 references)
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1251
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v4.0.0-m5
|
protected aliases
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Alias of a protected definition is also protected. E.g. `Nat.double` → `Ex.double` is protected.
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none
|
v4.0.0-m5
|
IO.rand
|
`IO.rand` seeds from `IO.getRandomBytes`, more secure random initialization (#2 references?).
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none
|
v4.0.0-m5
|
dot-notation/aliases
|
Improve dot-notation with namespace exports/aliases. E.g. `FinSet.union` as alias of `Set.union`.
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none
|
v4.0.0-m5
|
conv ext/enter
|
`ext` and `enter` conv tactics can go inside let-declarations in `conv at h => ...` blocks.
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none
|
v4.0.0-m5
|
conv zeta
|
New `zeta` conv tactic expands local let-declarations in the goal.
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none
|
v4.0.0-m5
|
Namespace resolution
|
Improve how `open Tactic` can open both `Lean.Parser.Tactic` and `Lean.Elab.Tactic` (#1224 references).
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1224
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v4.0.0-m5
|
opaque command
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Rename `constant` command to `opaque` for truly opaque definitions. Zulip discussion linked for details.
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none
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v4.0.0-m5
|
induction/cases syntax
|
Support multiple left-hand-sides in a single alternative. Example: `cases v with | mk1 x | mk2 x => ...`
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none
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v4.0.0-m5
|
do-block indentation
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`let/if` indentation in do-blocks is supported (#1120 references).
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1120
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v4.0.0-m5
|
Unnamed antiquotation
|
New `$_` antiquotation for syntax patterns without naming a placeholder.
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none
|
v4.0.0-m5
|
Unused variables linter
|
Warn about unused variables in tactics. (#1159 references).
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1159
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v4.0.0-m5
|
Universe param check
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Error if a decl body references a universe param not in its type or not explicit. E.g. hidden `PUnit.{u}` usage.
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none
|
v4.0.0-m5
|
subst_vars tactic
|
New `subst_vars` tactic to systematically substitute variable equalities.
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none
|
v4.0.0-m5
|
autoParam structure fields
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Fix for lost `autoParam` in multiple inherited structure fields (#1158).
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1158
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v4.0.0-m5
|
[eliminator] attribute
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Allows specifying a default recursor for `induction`/`cases`. Alternative to `using <recursor>` syntax.
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none
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v4.0.0-m5
|
casesOn for recursion
|
Add support for `casesOn` in structural & well-founded recursion modules. E.g. writing definitions with tactics.
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none
|
v4.0.0-m5
|
Option monad
|
`Option` is once again a monad (removed `OptionM`). (#279761084 references).
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none
|
v4.0.0-m5
|
split tactic
|
Improved: can handle `match h : e with` even if `e` not a free variable. No more failing generalization step.
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none
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v4.0.0-m5
|
match h : e encoding
|
Preserve `h : e` discriminants so tools like `split` can benefit from them. E.g. `match h : foo x with...`
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none
|
v4.0.0-m5
|
exists tactic
|
`exists term1, term2, ...` supports comma-separated values in one statement.
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none
|
v4.0.0-m5
|
dsimp/dsimp!
|
Add tactics `dsimp` & `dsimp!` applying only rfl-theorems, preserving definitional equality in the result.
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none
|
v4.0.0-m5
|
match pattern binder info
|
Fix binder info for patterns using `[matchPattern]`-tagged defs like `Nat.add` in match expressions.
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none
|
v4.0.0-m5
|
structure field defaults
|
Now can depend on structure parameters. E.g. `n2 : Nat := 1 + i` is allowed.
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none
|
v4.0.0-m5
|
dsimp in simp
|
`dsimp` method in `simp` can apply `rfl`-theorems. Allows inlined expansions for better rewriting.
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none
|
v4.0.0-m5
|
Auto-bound refinement
|
Auto-bound no longer captures the declaration's own name for an unbound variable. (#f → (#f is a var)??).
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none
|
v4.0.0-m5
|
Syntax highlight fix
|
No longer highlights some recursive calls as variables in inductive or function definitions.
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none
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v4.0.0-m5
|
simp autoUnfold
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`simp!`, `simp_arith!`, `simp_all!`, and `simp_all_arith!` auto-unfold recursive or match-based definitions.
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none
|
v4.0.0-m5
|
save tactic
|
`save` is a shorter alias for `checkpoint ...` in tactic scripts.
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none
|
v4.0.0-m5
|
Remove constructor `{}`
|
Removed support for `{}` annotation in inductive & structure commands. Use new parameter/indices promotion.
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none
|
v4.0.0-m5
|
LSP improvements
|
Several fixes for go-to-definition in mutually rec defs, match patterns, pattern variables, etc.
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none
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v4.0.0-m5
|
macro comb patterns
|
`macro ... xs:p* ...` has `xs : Array Syntax`. This ensures correct type for repeated parser combinators.
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none
|
v4.0.0-m5
|
Ignored macro scopes
|
Syntax patterns ignore macro scopes in identifiers, improving pattern matching reliability.
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none
|
v4.0.0-m5
|
constructor param names
|
Improve auto implicit param naming for constructor arguments in mutual inductives (ex: `α` instead of `x`).
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none
|
v4.0.0-m5
|
Error message
|
Better error if constructor parameter's universe is too large. More consistent with other checks.
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none
|
v4.0.0-m5
|
for h : i in [start:stop]
|
Support iteration with index proof in `[start:stop]`. Eases termination proofs in loops over arrays, etc.
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none
|
v4.0.0-m5
|
case' tactic
|
`case'` is a variant of `case` that fails outright if the case doesn't exist, skipping fallback admission.
|
none
|
v4.0.0-m5
|
stop tactic
|
Add `macro stop s:tacticSeq => repeat sorry`. Debug/placeholder tactic macro on discussion at Zulip.
|
none
|
v4.0.0-m5
|
Display goals
|
Don't display inaccessible proposition names if no forward dependencies. Only their types are shown.
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none
|
v4.0.0-m5
|
by_cases
|
Hypothesis name is optional in `by_cases p`, e.g. `by_cases p => ...` just references it as `this` or `_`.
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none
|
v4.0.0-m5
|
syntax vs. kind names
|
Rename node kinds: `numLit`→`num`, `charLit`→`char`, `nameLit`→`name`, `strLit`→`str`, `scientificLit`→`scientific` (#1090).
|
1090
|
v4.0.0-m5
|
checkpoint tactic
|
Experimental `checkpoint <tactic-seq>` for partial proof steps in large scripts.
|
none
|
v4.0.0-m5
|
rename nativeDecide
|
Renamed tactic `nativeDecide` to `native_decide` for naming consistency.
|
none
|
v4.0.0-m5
|
Antiquotations
|
Now accepted in any syntax context. Removed `incQuotDepth` parser. Simplifies macro dev.
|
none
|
v4.0.0-m5
|
Local context cleanup
|
Remove `_discr := ...` or `h✝` from match patterns/branches, simplifying the local context.
|
none
|
v4.0.0-m5
|
let/have pattern macros
|
Expansion ensures the goal references the new bindings, e.g. `let (a,b) := x` yields `f (a,b)` not `f x`.
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none
|
v4.0.0-m5
|
Releases for aarch64
|
Add cross-compiled aarch64 Linux and macOS builds. (#1066, #1076 references)
|
none
|
v4.0.0-m5
|
doc/examples
|
Added tutorial-like examples using LeanInk+Alectryon for documentation.
|
none
|
v4.0.0-m4
|
simp attributes
|
`simp` now supports user-defined simp-attributes. E.g. `register_simp_attr my_simp` for a custom set.
|
none
|
v4.0.0-m4
|
Extended match syntax
|
Multiple LHS in single alternative, e.g. `| 0 | 1 => 1`. (#371 references).
|
371
|
v4.0.0-m4
|
#eval fallback
|
`#eval` tries to reduce the type further if no `Lean.MetaEval` is found initially. E.g. `def Foo := List Nat` now works.
|
none
|
v4.0.0-m4
|
rw tactic eqn theorems
|
`rw` can apply auto-generated equation lemmas for a definition. E.g. `rw [List.length]` to step through eqns.
|
none
|
v4.0.0-m4
|
Auto completion
|
Fuzzy matching for auto-completion (#1023).
|
1023
|
v4.0.0-m4
|
Function.field dot notation
|
`f.comp g` notation for function composition if `f : α→β`; done via `Function.field` arrow-type lookups.
|
none
|
v4.0.0-m4
|
swift-like .<identifier>
|
Supports `.map .succ xs` etc. when a function type is expected (Zulip #944 references).
|
944
|
v4.0.0-m4
|
Folding
|
Added code folding support to language server (#1014).
|
1014
|
v4.0.0-m4
|
do-block let <pattern> := e | alt
|
Allow `let <pattern> := e | alt` in do-blocks for simple branching. Removes older partial expansions.
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none
|
v4.0.0-m4
|
Remove auto pure
|
No more 'auto' pure resolution. Must specify the monad or use type ascription if needed.
|
none
|
v4.0.0-m4
|
congr theorems
|
No longer require all function args to be free vars on LHS. Partial argument usage is allowed.
|
none
|
v4.0.0-m4
|
partially-applied congr
|
Allow partially applied congruence theorems for more general rewriting (#988 references).
|
988
|
v4.0.0-m4
|
Expected type heuristic
|
Reduce expected type if it's a metavariable before elaboration, to avoid incorrect postponement.
|
none
|
v4.0.0-m4
|
Remove leanpkg
|
Deprecated `leanpkg` replaced by Lake as the package manager (#985).
|
985
|
v4.0.0-m4
|
Go-to-definition
|
Improve find-all-refs for newly introduced definitions. Also fix coverage for partial expansions.
|
none
|
v4.0.0-m4
|
autoDecidable
|
Auto generated congr lemmas can cast proofs/`Decidable` instances (#988 references).
|
none
|
v4.0.0-m4
|
autoBoundImplicitLocal => autoImplicit
|
Renamed the option controlling auto-bound implicits to `autoImplicit`.
|
none
|
v4.0.0-m4
|
contradiction tactic
|
`contradiction` closes the goal if `False.elim` is in the target or a local hypothesis.
|
none
|
v4.0.0-m4
|
byCases => by_cases
|
Renamed tactic `byCases` to `by_cases` for naming convention consistency.
|
none
|
v4.0.0-m4
|
Local instance in patterns
|
Typeclass resolution can use local instances from patterns, e.g. `(⟨_, inst⟩ :: as).
|
none
|
v4.0.0-m4
|
motive in match
|
Now `(motive := (args) → ...)` syntax instead of whitespace-based. E.g. `match (motive := ...) x, rfl with ...`
|
none
|
v4.0.0-m4
|
generalizing = true by default
|
`match` defaults to `(generalizing := true)` even if the result type is not a Prop. E.g. no extra annotation needed.
|
none
|
v4.0.0-m4
|
PSum usage
|
Mutually recursive definitions use `PSum` instead of `Sum` for well-founded rec. (#??) no PR # here.
|
none
|
v4.0.0-m4
|
Parametric well-founded
|
Better support for parametric well-founded relations (#1017).
|
1017
|
v4.0.0-m4
|
while/do-block
|
Add macros `while <cond>` / `repeat <do>` / `repeat <do> until <cond>` for partial/do usage only.
|
none
|
v4.0.0-m4
|
arith in `simp`
|
New `arith` option in `Simp.Config`. `simp_arith` includes Nat linear arithmetic rewriting.
|
none
|
v4.0.0-m4
|
fail tactic
|
`fail <message>` tactic that always fails with a user-provided error text.
|
none
|
v4.0.0-m4
|
acyclicity in dep elim
|
Check acyclicity in dependent elimination, addressing #1022 potentially.
|
1022
|
v4.0.0-m4
|
trace tactic
|
Add `trace <string>` tactic for debugging messages within proofs.
|
none
|
v4.0.0-m4
|
SizeOf for (Unit→α)
|
Add nontrivial `SizeOf` for function types `Unit→α` and in user-defined inductives with delayed fields.
|
none
|
v4.0.0-m4
|
Guess simpler WF
|
Try simple well-founded relations automatically for recursion. E.g. no extra `termination_by` needed for array loops.
|
none
|
v4.0.0-m4
|
for x in xs do
|
Add `for h : x in xs do ...` meaning `h : x ∈ xs`. Useful for termination of iteration-based definitions.
|
none
|
v4.0.0-m4
|
Auto-implicit chaining
|
Unassigned metavariables in auto-implicit types become fresh auto-implicit locals. E.g. `HasType` example with `n`.
|
none
|
v4.0.0-m4
|
promote prefix to parameters
|
Fixed prefix of inductive family indices is promoted to parameters if they do not vary. E.g. `Sublist`, `Lst` examples.
|
none
|
v4.0.0-m4
|
Auto-implicit rec
|
Chaining unassigned meta in index types now fosters correct type injection for families (#??).
|
none
|
v4.0.0-m4
|
Eliminate autoParam/optParam in recursors
|
Recursor minor premises & structure projections no longer carry autoParam/optParam overhead.
|
none
|
v4.0.0-m4
|
Overloaded notation in patterns
|
Allowed if each alternative has the same pattern variable set. E.g. `::` for List/Vector in different contexts.
|
none
|
v4.0.0-m4
|
Swift-like dot syntax
|
Introducing `.<ident>` notation. Infers namespace from expected type. E.g. `.ok x`, `.error "..."`
|
944
|
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