Possibly the more principled fix is to not have `simp` invoke
dischargers under `withReducible`.
In the meantime, this ensures that `falseOrByContra` still succeeds with
`intro1` on a `Not` goal, which previously was breaking `omega` as a
simp discharger.
Closes#3805.
This fixes an issue where the completion would use info nodes before the
cursor for computing completions.
Fixes https://github.com/leanprover/lean4/issues/3462.
ToDo:
- [x] Fix test failures for completions that previously worked by
accident (cc: @Kha)
- [x] stage0 update
---------
Co-authored-by: Sebastian Ullrich <sebasti@nullri.ch>
The matches returned by the lazy discriminator tree are partially
constrained by a priority, but ties are broken by the order in which
keys are traversed and the order of declarations.
This PR changes the match key traversal to use an explicit stack rather
than recursion and implicitly changes the order in which results are
returned to favor left-matches first e.g., given the term `f a b` with
constants `f a b`, and a tree with patterns `f a x -> 1` `f x b -> 2`
that have the same priority, this will return `#[1, 2]` since the early
matches for the key `a` are returned before the match for `x` which has
a star.
This appears to address the [lower quality results mentioned on
zulip](https://leanprover.zulipchat.com/#narrow/stream/428973-nightly-testing/topic/Mathlib.20status.20updates/near/429955747).
When `discharge?` failed, the `usedSimps` was being restored, but the
cache wasn't. This bug was exposed by issue #3710.
This PR makes the following changes:
- We restore the `cache` at `discharge?`. We use `SMap` to ensure the
operation is efficient.
- We don't need the field `dischargeDepth` anymore at `Simp.Result`.
- `UsedSimps` should use `PHashMap` since it is not used linearly.
closes#3710
---------
Co-authored-by: Mario Carneiro <di.gama@gmail.com>
Now, only `(<- ...)`s occurring in the condition of a pure if-then-else
are lifted.
That is, `if (<- foo) then ... else ...` is ok, but `if ... then (<-
foo) else ...` is not. See #3713closes#3713
This PR also adjusts this repo. Note that some of the `(<- ...)` were
harmless since they were just accessing some
read-only state.
It have to keep it as a private definition for now. We currently only
support duplicate theorems in different modules. Splitters are generated
on demand, and are also used to write code.
Adds a `lake lean` CLI command that builds the imports of a Lean file
and then elaborates it via `lean` with the workspace's configuration
(i.e., adding the `moreLeanArgs` / `leanOptions` of the root `package`
and Lake's environment).
* Setting `pp.mvars` to false causes metavariables to pretty print as
`?_`.
* Setting `pp.mvars.withType` to true causes metavariables to pretty
print with type ascriptions.
Motivation: when making tests, it is inconvenient using `#guard_msgs`
when there are metavariables, since the unique numbering is subject to
change.
This feature does not use `⋯` omissions since a metavariable is already
in a sense an omitted term. If repeated metavariables do not appear in
an expression, there is a chance that a term pretty printed with
`pp.mvars` set to false can still elaborate to the correct term, unlike
for other omissions.
(In the future we could consider an option that pretty prints uniquely
numbered metavariables as `?m✝`, `?m✝¹`, `?m✝²`, etc. to be able to tell
them apart, at least in the same pretty printed expression. It would
take care to make sure that these names are stable across different
hovers.)
Closes#3781
The `conv` tactic tries to close “trivial” goals after itself. As of
now, it uses
`try rfl`, which means it can close goals that are only trivial after
reducing with
default transparency. This is suboptimal
* this can require a fair amount of unfolding, and possibly slow down
the proof
a lot. And the user cannot even prevent it.
* it does not match what `rw` does, and a user might expect the two to
behave the
same.
So this PR changes it to `with_reducible rfl`, matching `rw`’s behavior.
I considered `with_reducible eq_refl` to only solve trivial goals that
involve equality,
but not other relations (e.g. `Perm xs xs`), but a discussion on mathlib
pointed out
that it’s expected and desirable to solve more general reflexive goals:
https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/Closing.20after.20.60rw.60.2C.20.60conv.60.3A.20.60eq_refl.60.20instead.20of.20.60rfl.60/near/429851605
Modifies `withBindingBodyUnusedName` to annotate the syntax for the
variable with its corresponding fvar. Now, for example, you can hover
over the variables in `fun x y => ...` in the infoview to see their
types. This change affects notations such as `∃ n, n = 1`, where
hovering over `n` shows that `n : Nat`.
Also adds such annotations for the variables in `let` and `let_fun`.
Implementation note: the variables are annotated with fresh positions
using `nextExtraPos`.
Removes the unused and unnecessary
`Lean.PrettyPrinter.Delaborator.liftMetaM`.
Closes#1618, closes#2737
This PR includes the following fixes:
- Reserved name resolution inside namespaces
- Equation theorems for `match`er declarations are not private anymore
- Equation theorems for `match`er declarations are realizable
- `foo.match_<idx>.splitter` is now a reserved name
Normalize the relative packages directory paths in the pre-rename check
to avoid renames if the difference in paths is only in the path
separators. Also adds a log message on rename.
Commands that can optionally parse an `ident` or parse any number of
`ident`s generally should require that the `ident` use `colGt`. This
keeps typos in commands from being interpreted as identifiers.
For example, without this rule,
```
universe u
Open Lean
````
parses the same as `universe u Open Lean`. It would be better to get an
error on `Open`.
This PR adds `checkColGt` to `section`, `namespace`, `end`, `variable`,
and `universe`.
Closes#2684
Adds an alternative TOML configuration format to Lake.
* Uses TOML v1.0.0 and is fully specification compliant (tested via
[toml-test v1.4.0](https://github.com/toml-lang/toml-test/tree/v1.4.0)).
* Supports package configuration options, Lean libraries, Lean
executables, and dependencies.
* TOML configurations can be generated for new projects via `lake
new|init <pkg> <template>.toml`.
* Supported configurations can be converted to/from TOML via `lake
translate-config <lang>`.
This makes changes to the `GetElem` class so that it does not lead to
unnecessary overhead in container like `RBMap`.
The changes are to:
1. Make `getElem?` and `getElem!` part of the `GetElem` class so they
can be overridden in instances.
2. Introduce a `LawfulGetElem` class that contains correctness theorems
for `getElem?` and `getElem!` using the original definitions.
3. Reorganize definitions (e.g, by moving `GetElem` out of
`Init.Prelude`) so that the `GetElem` changes are feasible.
4. Provide `LawfulGetElem` instances to complement all existing
`GetElem` instances in Lean core.
To reduce the size of the PR, this doesn't do the work of providing new
`GetElem` instances for `RBMap`, `HashMap` etc. That will be done in a
separate PR (#3688) that depends on this.
---------
Co-authored-by: Mac Malone <tydeu@hatpress.net>
fixes#3657
These functions are mostly not used by lean itself, but it does affect
two occurrences of `ByteArray.toUInt64LE! <$> IO.getRandomBytes 8` which
I left as is instead of switching them to use `toUInt64BE!` to preserve
behavior; but they are random bytes anyway seeded by the OS so it's
unlikely any use of them depending on particular values was sound to
begin with.
Co-authored-by: Scott Morrison <scott.morrison@gmail.com>
When it was upstreamed, it lost the mention of "revert/intro pattern",
which is helpful for finding this function. Also extended the
description of the function and clarified some points.
---------
Co-authored-by: Scott Morrison <scott.morrison@gmail.com>
Previously we were suggesting rebasing onto the most recently nightly in
the branches history, but that is incorrect and we should *always*
suggest rebasing on `origin/nightly-with-mathlib`.
---------
Co-authored-by: Joachim Breitner <mail@joachim-breitner.de>
This avoids printing the entire docstring for `⋯` when hovering over it,
which is rather long, and instead it gives a brief reason for omission
and what option to set to pretty print the omitted term.
Previously:
If the `rfl` macro was going to fail, it would:
1. expand to `eq_refl`, which is implemented by
`Lean.Elab.Tactic.evalRefl`, and call `Lean.MVarId.refl` which would:
* either try kernel defeq (if in `.default` or `.all` transparency mode)
* otherwise try `IsDefEq`
* then fail.
2. Next expand to the `apply_rfl` tactic, which is implemented by
`Lean.Elab.Tactic.Rfl.evalApplyRfl`, and call `Lean.MVarId.applyRefl`
which would look for lemmas labelled `@[refl]`, and unfortunately in
Mathlib find `Eq.refl`, so try applying that (resulting in another
`IsDefEq`)
3. Because of an accidental duplication, if `Lean.Elab.Tactic.Rfl` was
imported, it would *again* expand to `apply_rfl`.
Now:
1. Same behaviour in `eq_refl`.
2. The `@[refl]` attribute will reject `Eq.refl`, and `MVarId.applyRefl`
will fail when applied to equality goals.
3. The duplication has been removed.
[Before](https://github.com/leanprover/lean4/files/14772220/oi.pdf) and
[after](https://github.com/leanprover/lean4/files/14772226/oi2.pdf).
This gets `ByteArray`, `String.Extra`, `ToString.Macro` and `RCases` out
of the imports of `omega`. I'd hoped to get `Array.Subarray` too, but
it's tangled up in the list literal syntax. Further progress could come
from make `split` use available `Decidable` instances, so we could pull
out `Classical` (and possibly some of `PropLemmas`).
I think this was in error in my original Mathlib implementation. We're
not interested in relations other than `=`, so there is no point uses
`MVarId.applyRfl`, which just looks up `@[refl]` tagged lemmas and tries
those.
In a separate PR, I will change `MVarId.applyRfl` so it has a flag to
control whether on `=` it should just hand-off to `MVarId.refl`, or
fail. Failure is appropriate in the version we call from the `rfl`
macro, to avoid doing a double `IsDefEq` check on every `rfl`!
This makes several changes to rw? and lazy discrimination trees based on
test failures in rewrite search.
Changes include:
1. Reverting to Mathlib function for candidate lemma priority in rw?
2. Introducing additional filters for auto-generated named in lazy
discriminator tree.
3. Refactoring lazy discriminator values to clarify what is stored.
4. Including star keys in calculation of match closeness in
prioritization.
5. Using more fields in current core context when initializing lazy
discriminator tree and avoiding max heartbeat issues.
---------
Co-authored-by: Scott Morrison <scott.morrison@gmail.com>
no need to enter `derive_functional_induction` anymore.
(Will remove the support for `derive_functional_induction` after the
next stage0 update, since we are already using it in Init.)
fixes#3770
Also start `rfl` with a `fail` message that is hopefully more helpful
than what we get now (see updated test output). This would be a cheaper
way to address #3302 without changing the implementation of rfl (as
tried in #3714).
