This PR adds `have` forms of simp lemmas that will be used in a future `have` simplifier. This depends on leanprover#8751 and future elaboration changes, since these are meant to elaborate using `Expr.letE (nondep := true) ..` expressions; otherwise they are duplicates of the `letFun_*` lemmas.

This PR adds `have` forms of simp lemmas that will be used in a future
`have` simplifier. This depends on #8751 and future elaboration changes,
since these are meant to elaborate using `Expr.letE (nondep := true) ..`
expressions; for now they are duplicates of the `letFun_*` lemmas.

This PR implements first-class support for nondependent let expressions in the elaborator; recall that a let expression `let x := v; b` is called *nondependent* if `fun x => b` typechecks, and the notation for a nondependent let expression is `have x := v; b`. Previously we encoded `have` using the `letFun` function, but now we make use of the `nondep` flag in the `Expr.letE` constructor for the encoding. This has been fully supported throughout the metaprogramming interface and the elaborator.

Note that nondependence of lets is not checked by the kernel.

Follows up from leanprover#8751, which made sure the nondep flag was preserved in the C++ interface.

* Update lean-toolchain for testing leanprover/lean4#8584

* chore: adaptations for nightly-2025-06-02

* change phrasing of comments

* chore(Geometry/Manifold): two simp-lemmas can be proven by simp

* fix two lint problems

* Trigger CI for leanprover/lean4#8519

* chore: bump to nightly-2025-06-03

* fix

* fix

* Update lean-toolchain for testing leanprover/lean4#8610

* fix

* revert change in `Mathlib.Data.ZMOD.Basic`

* fix Mathlib/Data/List/EditDistance/Estimator.lean

* give specialized simp lemmas higher prio

* simp can prove these

* simp can prove these

* chore: bump to nightly-2025-06-04

* bump toolchain

* Adapt eqns

* Revert "Adapt eqns"

This reverts commit 34f1f7f.

* Simply remove check for now

* fix a bunch

* fixes?

* chore: adaptations for nightly-2025-06-04

* add `simp low` lemma `injOn_of_eq_iff_eq`

* wip

* wip

* wip

* fix

* Trigger CI for leanprover-community/batteries#1220

* Merge master into nightly-testing

* chore: bump to nightly-2025-06-05

* Kick CI

* Bump lean4-cli

* Bump import-graph

* Kick CI

* update lakefile

* chore: use more robust syntax quotation in Shake

* Trigger CI for leanprover/lean4#8419

* Revert "chore: use more robust syntax quotation in Shake"

This reverts commit cd87328.

* fix(Shake): fix import syntax

@Kha this is deliberately using this approach because syntax quotations
are also not robust but for a different reason: they fail to parse the
new versions of the syntax (and do so at run time). And using all the
optional doohickeys will not be future proof. The current setup is
explicitly meant to ping me when there is a syntax change so I can
evaluate the right way to handle it. In this case we want all the
module options to be ignored (treated the same as a regular import
for the purpose of dependency tracking), we don't want to fail.

* cleanup lakefile

* chore: bump to nightly-2025-06-06

* Update lean-toolchain for testing leanprover/lean4#8653

* fix

* how did this get dropped?!?!

* chore: bump to nightly-2025-06-07

* chore: bump to nightly-2025-06-08

* chore: bump to nightly-2025-06-09

* fix lakefile

* fix lint-style for new Lean.Options API

* chore: bump to nightly-2025-06-10

* chore: bump to nightly-2025-06-09

* merge lean-pr-testing-4

* chore: bump to nightly-2025-06-11

* chore: adaptations for nightly-2025-06-11

* Update Shake/Main.lean

Co-authored-by: Johan Commelin <johan@commelin.net>

* Apply suggestions from code review

* revert

* chore: adaptations for nightly-2025-06-11

* cleanup grind tests

* chore: bump to nightly-2025-06-12

* merge lean-pr-testing-8419

* chore: bump to nightly-2025-06-12

* merge lean-pr-testing-8653

* adaptation note

* oops

* chore: adaptations for nightly-2025-06-12

* remove nolint simpNF

* remove spurious file

* Update lean-toolchain for testing leanprover/lean4#8751

* fix

* chore: bump to nightly-2025-06-13

* Merge master into nightly-testing

* fix

* remove upstreamed

* drop no-op `show`

* chore: bump to nightly-2025-06-14

* chore: bump to nightly-2025-06-15

* intentionally left blank

* fix tests

---------

Co-authored-by: leanprover-community-mathlib4-bot <leanprover-community-mathlib4-bot@users.noreply.github.com>
Co-authored-by: mathlib4-bot <github-mathlib4-bot@leanprover.zulipchat.com>
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Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: Sebastian Ullrich <sebasti@nullri.ch>
Co-authored-by: Jovan Gerbscheid <jovan.gerbscheid@gmail.com>
Co-authored-by: Joachim Breitner <mail@joachim-breitner.de>
Co-authored-by: Mario Carneiro <di.gama@gmail.com>
Co-authored-by: sgouezel <sebastien.gouezel@univ-rennes1.fr>
Co-authored-by: Kyle Miller <kmill31415@gmail.com>

* chore: bump to nightly-2025-06-03

* fix

* fix

* Update lean-toolchain for testing leanprover/lean4#8610

* fix

* revert change in `Mathlib.Data.ZMOD.Basic`

* fix Mathlib/Data/List/EditDistance/Estimator.lean

* give specialized simp lemmas higher prio

* simp can prove these

* simp can prove these

* chore: bump to nightly-2025-06-04

* bump toolchain

* Adapt eqns

* Revert "Adapt eqns"

This reverts commit 34f1f7f.

* Simply remove check for now

* fix a bunch

* fixes?

* chore: adaptations for nightly-2025-06-04

* add `simp low` lemma `injOn_of_eq_iff_eq`

* wip

* wip

* wip

* fix

* Trigger CI for leanprover-community/batteries#1220

* Merge master into nightly-testing

* chore: bump to nightly-2025-06-05

* Kick CI

* Bump lean4-cli

* Bump import-graph

* Kick CI

* update lakefile

* chore: use more robust syntax quotation in Shake

* Trigger CI for leanprover/lean4#8419

* Revert "chore: use more robust syntax quotation in Shake"

This reverts commit cd87328.

* fix(Shake): fix import syntax

@Kha this is deliberately using this approach because syntax quotations
are also not robust but for a different reason: they fail to parse the
new versions of the syntax (and do so at run time). And using all the
optional doohickeys will not be future proof. The current setup is
explicitly meant to ping me when there is a syntax change so I can
evaluate the right way to handle it. In this case we want all the
module options to be ignored (treated the same as a regular import
for the purpose of dependency tracking), we don't want to fail.

* cleanup lakefile

* chore: bump to nightly-2025-06-06

* Update lean-toolchain for testing leanprover/lean4#8653

* fix

* how did this get dropped?!?!

* chore: bump to nightly-2025-06-07

* chore: bump to nightly-2025-06-08

* chore: bump to nightly-2025-06-09

* fix lakefile

* fix lint-style for new Lean.Options API

* chore: bump to nightly-2025-06-10

* chore: bump to nightly-2025-06-09

* merge lean-pr-testing-4

* chore: bump to nightly-2025-06-11

* chore: adaptations for nightly-2025-06-11

* Update Shake/Main.lean

Co-authored-by: Johan Commelin <johan@commelin.net>

* Apply suggestions from code review

* revert

* chore: adaptations for nightly-2025-06-11

* cleanup grind tests

* chore: bump to nightly-2025-06-12

* merge lean-pr-testing-8419

* chore: bump to nightly-2025-06-12

* merge lean-pr-testing-8653

* adaptation note

* oops

* chore: adaptations for nightly-2025-06-12

* remove nolint simpNF

* remove spurious file

* Update lean-toolchain for testing leanprover/lean4#8751

* fix

* chore: bump to nightly-2025-06-13

* Merge master into nightly-testing

* fix

* remove upstreamed

* drop no-op `show`

* chore: bump to nightly-2025-06-14

* chore: bump to nightly-2025-06-15

* intentionally left blank

* fix tests

* chore: bump to nightly-2025-06-16

* fix upstream

* fix

* fix

* fixes

---------

Co-authored-by: leanprover-community-mathlib4-bot <leanprover-community-mathlib4-bot@users.noreply.github.com>
Co-authored-by: github-actions <github-actions@github.com>
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Co-authored-by: Sebastian Ullrich <sebasti@nullri.ch>
Co-authored-by: Johan Commelin <johan@commelin.net>
Co-authored-by: Jovan Gerbscheid <jovan.gerbscheid@gmail.com>
Co-authored-by: Kim Morrison <kim@tqft.net>
Co-authored-by: Joachim Breitner <mail@joachim-breitner.de>
Co-authored-by: Mario Carneiro <di.gama@gmail.com>
Co-authored-by: sgouezel <sebastien.gouezel@univ-rennes1.fr>
Co-authored-by: Kyle Miller <kmill31415@gmail.com>

* revert change in `Mathlib.Data.ZMOD.Basic`

* fix Mathlib/Data/List/EditDistance/Estimator.lean

* give specialized simp lemmas higher prio

* simp can prove these

* simp can prove these

* chore: bump to nightly-2025-06-04

* bump toolchain

* Adapt eqns

* Revert "Adapt eqns"

This reverts commit 34f1f7f.

* Simply remove check for now

* fix a bunch

* fixes?

* chore: adaptations for nightly-2025-06-04

* add `simp low` lemma `injOn_of_eq_iff_eq`

* wip

* wip

* wip

* fix

* Trigger CI for leanprover-community/batteries#1220

* Merge master into nightly-testing

* chore: bump to nightly-2025-06-05

* Kick CI

* Bump lean4-cli

* Bump import-graph

* Kick CI

* update lakefile

* chore: use more robust syntax quotation in Shake

* Trigger CI for leanprover/lean4#8419

* Revert "chore: use more robust syntax quotation in Shake"

This reverts commit cd87328.

* fix(Shake): fix import syntax

@Kha this is deliberately using this approach because syntax quotations
are also not robust but for a different reason: they fail to parse the
new versions of the syntax (and do so at run time). And using all the
optional doohickeys will not be future proof. The current setup is
explicitly meant to ping me when there is a syntax change so I can
evaluate the right way to handle it. In this case we want all the
module options to be ignored (treated the same as a regular import
for the purpose of dependency tracking), we don't want to fail.

* cleanup lakefile

* chore: bump to nightly-2025-06-06

* Update lean-toolchain for testing leanprover/lean4#8653

* fix

* how did this get dropped?!?!

* chore: bump to nightly-2025-06-07

* chore: bump to nightly-2025-06-08

* chore: bump to nightly-2025-06-09

* fix lakefile

* fix lint-style for new Lean.Options API

* chore: bump to nightly-2025-06-10

* chore: bump to nightly-2025-06-09

* merge lean-pr-testing-4

* chore: bump to nightly-2025-06-11

* chore: adaptations for nightly-2025-06-11

* Update Shake/Main.lean

Co-authored-by: Johan Commelin <johan@commelin.net>

* Apply suggestions from code review

* revert

* chore: adaptations for nightly-2025-06-11

* cleanup grind tests

* chore: bump to nightly-2025-06-12

* merge lean-pr-testing-8419

* chore: bump to nightly-2025-06-12

* merge lean-pr-testing-8653

* adaptation note

* oops

* chore: adaptations for nightly-2025-06-12

* remove nolint simpNF

* remove spurious file

* Update lean-toolchain for testing leanprover/lean4#8751

* fix

* chore: bump to nightly-2025-06-13

* Merge master into nightly-testing

* fix

* remove upstreamed

* drop no-op `show`

* chore: bump to nightly-2025-06-14

* chore: bump to nightly-2025-06-15

* intentionally left blank

* fix tests

* chore: bump to nightly-2025-06-16

* fix upstream

* fix

* fix

* fixes

* chore: adaptations for nightly-2025-06-16

* chore: bump to nightly-2025-06-17

* fixes

* more fixes

* fixes!

* more fixes!

* hmm

* chore: adaptations for nightly-2025-06-17

---------

Co-authored-by: Jovan Gerbscheid <jovan.gerbscheid@gmail.com>
Co-authored-by: leanprover-community-mathlib4-bot <leanprover-community-mathlib4-bot@users.noreply.github.com>
Co-authored-by: Johan Commelin <johan@commelin.net>
Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: Kim Morrison <kim@tqft.net>
Co-authored-by: Joachim Breitner <mail@joachim-breitner.de>
Co-authored-by: mathlib4-bot <github-mathlib4-bot@leanprover.zulipchat.com>
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Co-authored-by: Mario Carneiro <di.gama@gmail.com>
Co-authored-by: sgouezel <sebastien.gouezel@univ-rennes1.fr>
Co-authored-by: Kyle Miller <kmill31415@gmail.com>
Co-authored-by: Rob23oba <robin.arnez@web.de>

…anprover#8751)

This PR adds the `nondep` field of `Expr.letE` to the C++ data model.
Previously this field has been unused, and in followup PRs the
elaborator will use it to encode `have` expressions (non-dependent
`let`s). The kernel does not verify that `nondep` is correctly applied
during typechecking. The `letE` delaborator now prints `have`s when
`nondep` is true, though `have` still elaborates as `letFun` for now.
Breaking change: `Expr.updateLet!` is renamed to `Expr.updateLetE!`.

This PR also fixes a bug in `Expr.letFun?` and `Expr.letFunAppArgs?`
when the body is not a lambda. In any case, these functions will be
removed once the `Expr.letE (nondep := true)` encoding of `have`
expressions is complete.

This PR adds `have` forms of simp lemmas that will be used in a future
`have` simplifier. This depends on leanprover#8751 and future elaboration changes,
since these are meant to elaborate using `Expr.letE (nondep := true) ..`
expressions; for now they are duplicates of the `letFun_*` lemmas.

This PR implements first-class support for nondependent let expressions in the elaborator; recall that a let expression `let x := v; b` is called *nondependent* if `fun x => b` typechecks, and the notation for a nondependent let expression is `have x := v; b`. Previously we encoded `have` using the `letFun` function, but now we make use of the `nondep` flag in the `Expr.letE` constructor for the encoding. This has been fully supported throughout the metaprogramming interface and the elaborator.

Note that nondependence of lets is not checked by the kernel.

Follows up from leanprover#8751, which made sure the nondep flag was preserved in the C++ interface.

* bump toolchain

* Adapt eqns

* Revert "Adapt eqns"

This reverts commit 34f1f7f.

* Simply remove check for now

* fix a bunch

* fixes?

* chore: adaptations for nightly-2025-06-04

* add `simp low` lemma `injOn_of_eq_iff_eq`

* wip

* wip

* wip

* fix

* Trigger CI for leanprover-community/batteries#1220

* Merge master into nightly-testing

* chore: bump to nightly-2025-06-05

* Kick CI

* Bump lean4-cli

* Bump import-graph

* Kick CI

* update lakefile

* chore: use more robust syntax quotation in Shake

* Trigger CI for leanprover/lean4#8419

* Revert "chore: use more robust syntax quotation in Shake"

This reverts commit cd87328.

* fix(Shake): fix import syntax

@Kha this is deliberately using this approach because syntax quotations
are also not robust but for a different reason: they fail to parse the
new versions of the syntax (and do so at run time). And using all the
optional doohickeys will not be future proof. The current setup is
explicitly meant to ping me when there is a syntax change so I can
evaluate the right way to handle it. In this case we want all the
module options to be ignored (treated the same as a regular import
for the purpose of dependency tracking), we don't want to fail.

* cleanup lakefile

* chore: bump to nightly-2025-06-06

* Update lean-toolchain for testing leanprover/lean4#8653

* fix

* how did this get dropped?!?!

* chore: bump to nightly-2025-06-07

* chore: bump to nightly-2025-06-08

* chore: bump to nightly-2025-06-09

* fix lakefile

* fix lint-style for new Lean.Options API

* chore: bump to nightly-2025-06-10

* chore: bump to nightly-2025-06-09

* merge lean-pr-testing-4

* chore: bump to nightly-2025-06-11

* chore: adaptations for nightly-2025-06-11

* Update Shake/Main.lean

Co-authored-by: Johan Commelin <johan@commelin.net>

* Apply suggestions from code review

* revert

* chore: adaptations for nightly-2025-06-11

* cleanup grind tests

* chore: bump to nightly-2025-06-12

* merge lean-pr-testing-8419

* chore: bump to nightly-2025-06-12

* merge lean-pr-testing-8653

* adaptation note

* oops

* chore: adaptations for nightly-2025-06-12

* remove nolint simpNF

* remove spurious file

* Update lean-toolchain for testing leanprover/lean4#8751

* fix

* chore: bump to nightly-2025-06-13

* Merge master into nightly-testing

* fix

* remove upstreamed

* drop no-op `show`

* chore: bump to nightly-2025-06-14

* chore: bump to nightly-2025-06-15

* intentionally left blank

* fix tests

* chore: bump to nightly-2025-06-16

* fix upstream

* fix

* fix

* fixes

* chore: adaptations for nightly-2025-06-16

* chore: bump to nightly-2025-06-17

* fixes

* more fixes

* fixes!

* more fixes!

* hmm

* chore: adaptations for nightly-2025-06-17

* chore: adaptations for nightly-2025-06-17

* chore: lint `show` (adaptation for leanprover/lean4#7395) (#25749)

Adds `show` as an exception to the unused tactic linter and adds a separate linter for `show`s that should be replaced by `change`.
Context: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/unused.20tactic.20linter.20for.20.60show.60/with/523701633

Co-authored-by: Christian Merten <christian@merten.dev>
Co-authored-by: Kenny Lau <kc_kennylau@yahoo.com.hk>
Co-authored-by: Fabrizio Barroero <fbarroero@gmail.com>
Co-authored-by: Rob23oba <robin.arnez@web.de>
Co-authored-by: leanprover-community-mathlib4-bot <leanprover-community-mathlib4-bot@users.noreply.github.com>
Co-authored-by: Rob23oba <152706811+Rob23oba@users.noreply.github.com>
Co-authored-by: Kim Morrison <kim@tqft.net>

* chore: bump to nightly-2025-06-18

* chore: adaptations for nightly-2025-06-18

---------

Co-authored-by: leanprover-community-mathlib4-bot <leanprover-community-mathlib4-bot@users.noreply.github.com>
Co-authored-by: Kim Morrison <kim@tqft.net>
Co-authored-by: Joachim Breitner <mail@joachim-breitner.de>
Co-authored-by: mathlib4-bot <github-mathlib4-bot@leanprover.zulipchat.com>
Co-authored-by: Johan Commelin <johan@commelin.net>
Co-authored-by: Jovan Gerbscheid <jovan.gerbscheid@gmail.com>
Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: Sebastian Ullrich <sebasti@nullri.ch>
Co-authored-by: Mario Carneiro <di.gama@gmail.com>
Co-authored-by: sgouezel <sebastien.gouezel@univ-rennes1.fr>
Co-authored-by: Kyle Miller <kmill31415@gmail.com>
Co-authored-by: Rob23oba <robin.arnez@web.de>
Co-authored-by: Rob23oba <101damnations@github.com>
Co-authored-by: Christian Merten <christian@merten.dev>
Co-authored-by: Kenny Lau <kc_kennylau@yahoo.com.hk>
Co-authored-by: Fabrizio Barroero <fbarroero@gmail.com>
Co-authored-by: Rob23oba <152706811+Rob23oba@users.noreply.github.com>

* Trigger CI for leanprover-community/batteries#1220

* Merge master into nightly-testing

* chore: bump to nightly-2025-06-05

* Kick CI

* Bump lean4-cli

* Bump import-graph

* Kick CI

* update lakefile

* chore: use more robust syntax quotation in Shake

* Trigger CI for leanprover/lean4#8419

* Revert "chore: use more robust syntax quotation in Shake"

This reverts commit cd87328.

* fix(Shake): fix import syntax

@Kha this is deliberately using this approach because syntax quotations
are also not robust but for a different reason: they fail to parse the
new versions of the syntax (and do so at run time). And using all the
optional doohickeys will not be future proof. The current setup is
explicitly meant to ping me when there is a syntax change so I can
evaluate the right way to handle it. In this case we want all the
module options to be ignored (treated the same as a regular import
for the purpose of dependency tracking), we don't want to fail.

* cleanup lakefile

* chore: bump to nightly-2025-06-06

* Update lean-toolchain for testing leanprover/lean4#8653

* fix

* how did this get dropped?!?!

* chore: bump to nightly-2025-06-07

* chore: bump to nightly-2025-06-08

* chore: bump to nightly-2025-06-09

* fix lakefile

* fix lint-style for new Lean.Options API

* chore: bump to nightly-2025-06-10

* chore: bump to nightly-2025-06-09

* merge lean-pr-testing-4

* chore: bump to nightly-2025-06-11

* chore: adaptations for nightly-2025-06-11

* Update Shake/Main.lean

Co-authored-by: Johan Commelin <johan@commelin.net>

* Apply suggestions from code review

* revert

* chore: adaptations for nightly-2025-06-11

* cleanup grind tests

* chore: bump to nightly-2025-06-12

* merge lean-pr-testing-8419

* chore: bump to nightly-2025-06-12

* merge lean-pr-testing-8653

* adaptation note

* oops

* chore: adaptations for nightly-2025-06-12

* remove nolint simpNF

* remove spurious file

* Update lean-toolchain for testing leanprover/lean4#8751

* fix

* chore: bump to nightly-2025-06-13

* Merge master into nightly-testing

* fix

* remove upstreamed

* drop no-op `show`

* chore: bump to nightly-2025-06-14

* chore: bump to nightly-2025-06-15

* intentionally left blank

* fix tests

* chore: bump to nightly-2025-06-16

* fix upstream

* fix

* fix

* fixes

* chore: adaptations for nightly-2025-06-16

* chore: bump to nightly-2025-06-17

* fixes

* more fixes

* fixes!

* more fixes!

* hmm

* chore: adaptations for nightly-2025-06-17

* chore: adaptations for nightly-2025-06-17

* chore: lint `show` (adaptation for leanprover/lean4#7395) (#25749)

Adds `show` as an exception to the unused tactic linter and adds a separate linter for `show`s that should be replaced by `change`.
Context: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/unused.20tactic.20linter.20for.20.60show.60/with/523701633

Co-authored-by: Christian Merten <christian@merten.dev>
Co-authored-by: Kenny Lau <kc_kennylau@yahoo.com.hk>
Co-authored-by: Fabrizio Barroero <fbarroero@gmail.com>
Co-authored-by: Rob23oba <robin.arnez@web.de>
Co-authored-by: leanprover-community-mathlib4-bot <leanprover-community-mathlib4-bot@users.noreply.github.com>
Co-authored-by: Rob23oba <152706811+Rob23oba@users.noreply.github.com>
Co-authored-by: Kim Morrison <kim@tqft.net>

* chore: bump to nightly-2025-06-18

* chore: adaptations for nightly-2025-06-18

* Merge master into nightly-testing

* chore: bump to nightly-2025-06-19

* fix

* remove mul_hmul

* linter

* chore: bump to nightly-2025-06-20

* chore: adaptations for nightly-2025-06-20

---------

Co-authored-by: leanprover-community-mathlib4-bot <leanprover-community-mathlib4-bot@users.noreply.github.com>
Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: Joachim Breitner <mail@joachim-breitner.de>
Co-authored-by: Kim Morrison <kim@tqft.net>
Co-authored-by: Sebastian Ullrich <sebasti@nullri.ch>
Co-authored-by: mathlib4-bot <github-mathlib4-bot@leanprover.zulipchat.com>
Co-authored-by: Mario Carneiro <di.gama@gmail.com>
Co-authored-by: Johan Commelin <johan@commelin.net>
Co-authored-by: sgouezel <sebastien.gouezel@univ-rennes1.fr>
Co-authored-by: Kyle Miller <kmill31415@gmail.com>
Co-authored-by: Rob23oba <robin.arnez@web.de>
Co-authored-by: Rob23oba <101damnations@github.com>
Co-authored-by: Christian Merten <christian@merten.dev>
Co-authored-by: Kenny Lau <kc_kennylau@yahoo.com.hk>
Co-authored-by: Fabrizio Barroero <fbarroero@gmail.com>
Co-authored-by: Rob23oba <152706811+Rob23oba@users.noreply.github.com>

This PR implements first-class support for nondependent let expressions in the elaborator; recall that a let expression `let x := v; b` is called *nondependent* if `fun x => b` typechecks, and the notation for a nondependent let expression is `have x := v; b`. Previously we encoded `have` using the `letFun` function, but now we make use of the `nondep` flag in the `Expr.letE` constructor for the encoding. This has been fully supported throughout the metaprogramming interface and the elaborator.

Note that nondependence of lets is not checked by the kernel.

Follows up from leanprover#8751, which made sure the nondep flag was preserved in the C++ interface.

This PR implements first-class support for nondependent let expressions
in the elaborator; recall that a let expression `let x : t := v; b` is
called *nondependent* if `fun x : t => b` typechecks, and the notation
for a nondependent let expression is `have x := v; b`. Previously we
encoded `have` using the `letFun` function, but now we make use of the
`nondep` flag in the `Expr.letE` constructor for the encoding. This has
been given full support throughout the metaprogramming interface and the
elaborator. Key changes to the metaprogramming interface:
- Local context `ldecl`s with `nondep := true` are generally treated as
`cdecl`s. This is because in the body of a `have` expression the
variable is opaque. Functions like `LocalDecl.isLet` by default return
`false` for nondependent `ldecl`s. In the rare case where it is needed,
they take an additional optional `allowNondep : Bool` flag (defaults to
`false`) if the variable is being processed in a context where the value
is relevant.
- Functions such as `mkLetFVars` by default generalize nondependent let
variables and create lambda expressions for them. The
`generalizeNondepLet` flag (default true) can be set to false if `have`
expressions should be produced instead. **Breaking change:** Uses of
`letLambdaTelescope`/`mkLetFVars` need to use `generalizeNondepLet :=
false`. See the next item.
- There are now some mapping functions to make telescoping operations
more convenient. See `mapLetTelescope` and `mapLambdaLetTelescope`.
There is also `mapLetDecl` as a counterpart to `withLetDecl` for
creating `let`/`have` expressions.
- Important note about the `generalizeNondepLet` flag: it should only be
used for variables in a local context that the metaprogram "owns". Since
nondependent let variables are treated as constants in most cases, the
`value` field might refer to variables that do not exist, if for example
those variables were cleared or reverted. Using `mapLetDecl` is always
fine.
- The simplifier will cache its let dependence calculations in the
nondep field of let expressions.
- The `intro` tactic still produces *dependent* local variables. Given
that the simplifier will transform lets into haves, it would be
surprising if that would prevent `intro` from creating a local variable
whose value cannot be used.

Note that nondependence of lets is not checked by the kernel. To
external checker authors: If the elaborator gets the nondep flag wrong,
we consider this to be an elaborator error. Feel free to typecheck `letE
n t v b true` as if it were `app (lam n t b default) v` and please
report issues.

This PR follows up from #8751, which made sure the nondep flag was
preserved in the C++ interface.

…anprover#8751)

This PR adds the `nondep` field of `Expr.letE` to the C++ data model.
Previously this field has been unused, and in followup PRs the
elaborator will use it to encode `have` expressions (non-dependent
`let`s). The kernel does not verify that `nondep` is correctly applied
during typechecking. The `letE` delaborator now prints `have`s when
`nondep` is true, though `have` still elaborates as `letFun` for now.
Breaking change: `Expr.updateLet!` is renamed to `Expr.updateLetE!`.

This PR also fixes a bug in `Expr.letFun?` and `Expr.letFunAppArgs?`
when the body is not a lambda. In any case, these functions will be
removed once the `Expr.letE (nondep := true)` encoding of `have`
expressions is complete.

This PR adds `have` forms of simp lemmas that will be used in a future
`have` simplifier. This depends on leanprover#8751 and future elaboration changes,
since these are meant to elaborate using `Expr.letE (nondep := true) ..`
expressions; for now they are duplicates of the `letFun_*` lemmas.

…prover#8804)

This PR implements first-class support for nondependent let expressions
in the elaborator; recall that a let expression `let x : t := v; b` is
called *nondependent* if `fun x : t => b` typechecks, and the notation
for a nondependent let expression is `have x := v; b`. Previously we
encoded `have` using the `letFun` function, but now we make use of the
`nondep` flag in the `Expr.letE` constructor for the encoding. This has
been given full support throughout the metaprogramming interface and the
elaborator. Key changes to the metaprogramming interface:
- Local context `ldecl`s with `nondep := true` are generally treated as
`cdecl`s. This is because in the body of a `have` expression the
variable is opaque. Functions like `LocalDecl.isLet` by default return
`false` for nondependent `ldecl`s. In the rare case where it is needed,
they take an additional optional `allowNondep : Bool` flag (defaults to
`false`) if the variable is being processed in a context where the value
is relevant.
- Functions such as `mkLetFVars` by default generalize nondependent let
variables and create lambda expressions for them. The
`generalizeNondepLet` flag (default true) can be set to false if `have`
expressions should be produced instead. **Breaking change:** Uses of
`letLambdaTelescope`/`mkLetFVars` need to use `generalizeNondepLet :=
false`. See the next item.
- There are now some mapping functions to make telescoping operations
more convenient. See `mapLetTelescope` and `mapLambdaLetTelescope`.
There is also `mapLetDecl` as a counterpart to `withLetDecl` for
creating `let`/`have` expressions.
- Important note about the `generalizeNondepLet` flag: it should only be
used for variables in a local context that the metaprogram "owns". Since
nondependent let variables are treated as constants in most cases, the
`value` field might refer to variables that do not exist, if for example
those variables were cleared or reverted. Using `mapLetDecl` is always
fine.
- The simplifier will cache its let dependence calculations in the
nondep field of let expressions.
- The `intro` tactic still produces *dependent* local variables. Given
that the simplifier will transform lets into haves, it would be
surprising if that would prevent `intro` from creating a local variable
whose value cannot be used.

Note that nondependence of lets is not checked by the kernel. To
external checker authors: If the elaborator gets the nondep flag wrong,
we consider this to be an elaborator error. Feel free to typecheck `letE
n t v b true` as if it were `app (lam n t b default) v` and please
report issues.

This PR follows up from leanprover#8751, which made sure the nondep flag was
preserved in the C++ interface.

* chore: bump to nightly-2025-06-11

* chore: adaptations for nightly-2025-06-11

* Update Shake/Main.lean

Co-authored-by: Johan Commelin <johan@commelin.net>

* Apply suggestions from code review

* revert

* chore: adaptations for nightly-2025-06-11

* cleanup grind tests

* chore: bump to nightly-2025-06-12

* merge lean-pr-testing-8419

* chore: bump to nightly-2025-06-12

* merge lean-pr-testing-8653

* adaptation note

* oops

* chore: adaptations for nightly-2025-06-12

* remove nolint simpNF

* remove spurious file

* Update lean-toolchain for testing leanprover/lean4#8751

* fix

* chore: bump to nightly-2025-06-13

* Merge master into nightly-testing

* fix

* remove upstreamed

* drop no-op `show`

* chore: bump to nightly-2025-06-14

* chore: bump to nightly-2025-06-15

* intentionally left blank

* fix tests

* chore: bump to nightly-2025-06-16

* fix upstream

* fix

* fix

* fixes

* chore: adaptations for nightly-2025-06-16

* chore: bump to nightly-2025-06-17

* fixes

* more fixes

* fixes!

* more fixes!

* hmm

* chore: adaptations for nightly-2025-06-17

* chore: adaptations for nightly-2025-06-17

* chore: lint `show` (adaptation for leanprover/lean4#7395) (leanprover-community#25749)

Adds `show` as an exception to the unused tactic linter and adds a separate linter for `show`s that should be replaced by `change`.
Context: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/unused.20tactic.20linter.20for.20.60show.60/with/523701633

Co-authored-by: Christian Merten <christian@merten.dev>
Co-authored-by: Kenny Lau <kc_kennylau@yahoo.com.hk>
Co-authored-by: Fabrizio Barroero <fbarroero@gmail.com>
Co-authored-by: Rob23oba <robin.arnez@web.de>
Co-authored-by: leanprover-community-mathlib4-bot <leanprover-community-mathlib4-bot@users.noreply.github.com>
Co-authored-by: Rob23oba <152706811+Rob23oba@users.noreply.github.com>
Co-authored-by: Kim Morrison <kim@tqft.net>

* Update lean-toolchain for testing leanprover/lean4#8577

* chore: bump to nightly-2025-06-18

* chore: adaptations for nightly-2025-06-18

* Merge master into nightly-testing

* Update lean-toolchain for testing leanprover/lean4#8804

* Update lean-toolchain for testing leanprover/lean4#8699

* bump Qq and batteries

* meta adaptations

* bump aesop

* fix

* fix (adaptation note)

* Update lean-toolchain for leanprover/lean4#8699

* shake

* chore: bump to nightly-2025-06-19

* fix

* Update lean-toolchain for leanprover/lean4#8699

* fix: correct memoFix's use of unsafe code

* fix: adjust noncomputable annotations for new compiler

* fix: replace use of `open private _ in` with `open private _ from`

The implementation of `open private _ from` relies on specific
internals of the old compiler and will no longer work.

* remove mul_hmul

* chore: adjust one maxHeartbeats for the new compiler

* linter

* chore: bump to nightly-2025-06-20

* chore: adaptations for nightly-2025-06-20

* Update lean-toolchain for testing leanprover/lean4#8914

* chore: bump to nightly-2025-06-21

* fix

* fixes

* fixes

* fixes

* updated lake manifest

* comment out tests

* chore: fix for nightly-testing (leanprover-community#26246)

* fix

* fix

* fix grind typeclasses

* chore: adaptations for nightly-2025-06-20

* lake update

* Update lean-toolchain for leanprover/lean4#8914

* fix grind instance

* chore: bump to nightly-2025-06-22

* chore: bump to nightly-2025-06-23

* chore: rm unused `Lean.Util.Paths` import & use updated batteries

* Ensure we checkout mathlib4 master, not nightly-testing master (which does not exist)

* merge lean-pr-testing-8804

* Bump dependencies and silence linter.

* Fixes

(Now `elabSimpArgs` already handles `*`, so we can delete the associated code.)

* lake update; disable unusedSimpArgs in Batteries

* lkae update aesop

* disable unusedSimpArgs in MathlibTest

* fix grind instance priorities

* comment out MathlibTest/zmod with adaptation note

* touch for CI

* chore: bump to nightly-2025-06-24

* Kick CI

* Bump batteries

* Guessing adaption for leanprover/lean4#8929

* chore: bump to nightly-2025-06-25

* fix: workflow merging master into nightly-testing

* fix

* chore: cache get uses tracking remote

* touch for new CI

* restart CI

* chore: bump to nightly-2025-06-26

* Update lean-toolchain for testing leanprover/lean4#8928

* Teach Mathlib about `mrefine`

* Merge master into nightly-testing

* Update lean-toolchain for testing leanprover/lean4#8980

* chore: update linter warning test outputs

* chore: remove excess line break in deprecation lint now that notes add their own line breaks

* chore: more test cleanup

* .

* cleanup adaptation notes

* fix

* fix

* chore: bump to nightly-2025-06-27

* Merge master into nightly-testing

* Merge master into nightly-testing

* re-enable unusedSimpArgs

* re-enable unusedSimpArgs

* re-enable unusedSimpArgs

* re-enable unusedSimpArgs

* re-enable unusedSimpArgs

* fix tests

* chore: bump to nightly-2025-06-28

* Merge master into nightly-testing

* lintining

* lint

---------

Co-authored-by: leanprover-community-mathlib4-bot <leanprover-community-mathlib4-bot@users.noreply.github.com>
Co-authored-by: mathlib4-bot <github-mathlib4-bot@leanprover.zulipchat.com>
Co-authored-by: Johan Commelin <johan@commelin.net>
Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: sgouezel <sebastien.gouezel@univ-rennes1.fr>
Co-authored-by: Kyle Miller <kmill31415@gmail.com>
Co-authored-by: Sebastian Ullrich <sebasti@nullri.ch>
Co-authored-by: Rob23oba <robin.arnez@web.de>
Co-authored-by: Rob23oba <101damnations@github.com>
Co-authored-by: Christian Merten <christian@merten.dev>
Co-authored-by: Kenny Lau <kc_kennylau@yahoo.com.hk>
Co-authored-by: Fabrizio Barroero <fbarroero@gmail.com>
Co-authored-by: Rob23oba <152706811+Rob23oba@users.noreply.github.com>
Co-authored-by: Cameron Zwarich <cameron@lean-fro.org>
Co-authored-by: Mac Malone <mac@lean-fro.org>
Co-authored-by: Anne C.A. Baanen <vierkantor@vierkantor.com>
Co-authored-by: Joachim Breitner <mail@joachim-breitner.de>
Co-authored-by: Sebastian Graf <sg@lean-fro.org>
Co-authored-by: Joseph Rotella <7482866+jrr6@users.noreply.github.com>

* cleanup grind tests

* chore: bump to nightly-2025-06-12

* merge lean-pr-testing-8419

* chore: bump to nightly-2025-06-12

* merge lean-pr-testing-8653

* adaptation note

* oops

* chore: adaptations for nightly-2025-06-12

* remove nolint simpNF

* remove spurious file

* Update lean-toolchain for testing leanprover/lean4#8751

* fix

* chore: bump to nightly-2025-06-13

* Merge master into nightly-testing

* fix

* remove upstreamed

* drop no-op `show`

* chore: bump to nightly-2025-06-14

* chore: bump to nightly-2025-06-15

* intentionally left blank

* fix tests

* chore: bump to nightly-2025-06-16

* fix upstream

* fix

* fix

* fixes

* chore: adaptations for nightly-2025-06-16

* chore: bump to nightly-2025-06-17

* fixes

* more fixes

* fixes!

* more fixes!

* hmm

* chore: adaptations for nightly-2025-06-17

* chore: adaptations for nightly-2025-06-17

* chore: lint `show` (adaptation for leanprover/lean4#7395) (leanprover-community#25749)

Adds `show` as an exception to the unused tactic linter and adds a separate linter for `show`s that should be replaced by `change`.
Context: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/unused.20tactic.20linter.20for.20.60show.60/with/523701633

Co-authored-by: Christian Merten <christian@merten.dev>
Co-authored-by: Kenny Lau <kc_kennylau@yahoo.com.hk>
Co-authored-by: Fabrizio Barroero <fbarroero@gmail.com>
Co-authored-by: Rob23oba <robin.arnez@web.de>
Co-authored-by: leanprover-community-mathlib4-bot <leanprover-community-mathlib4-bot@users.noreply.github.com>
Co-authored-by: Rob23oba <152706811+Rob23oba@users.noreply.github.com>
Co-authored-by: Kim Morrison <kim@tqft.net>

* Update lean-toolchain for testing leanprover/lean4#8577

* chore: bump to nightly-2025-06-18

* chore: adaptations for nightly-2025-06-18

* Merge master into nightly-testing

* Update lean-toolchain for testing leanprover/lean4#8804

* Update lean-toolchain for testing leanprover/lean4#8699

* bump Qq and batteries

* meta adaptations

* bump aesop

* fix

* fix (adaptation note)

* Update lean-toolchain for leanprover/lean4#8699

* shake

* chore: bump to nightly-2025-06-19

* fix

* Update lean-toolchain for leanprover/lean4#8699

* fix: correct memoFix's use of unsafe code

* fix: adjust noncomputable annotations for new compiler

* fix: replace use of `open private _ in` with `open private _ from`

The implementation of `open private _ from` relies on specific
internals of the old compiler and will no longer work.

* remove mul_hmul

* chore: adjust one maxHeartbeats for the new compiler

* linter

* chore: bump to nightly-2025-06-20

* chore: adaptations for nightly-2025-06-20

* Update lean-toolchain for testing leanprover/lean4#8914

* chore: bump to nightly-2025-06-21

* fix

* fixes

* fixes

* fixes

* updated lake manifest

* comment out tests

* chore: fix for nightly-testing (leanprover-community#26246)

* fix

* fix

* fix grind typeclasses

* chore: adaptations for nightly-2025-06-20

* lake update

* Update lean-toolchain for leanprover/lean4#8914

* fix grind instance

* chore: bump to nightly-2025-06-22

* chore: bump to nightly-2025-06-23

* chore: rm unused `Lean.Util.Paths` import & use updated batteries

* Ensure we checkout mathlib4 master, not nightly-testing master (which does not exist)

* merge lean-pr-testing-8804

* Bump dependencies and silence linter.

* Fixes

(Now `elabSimpArgs` already handles `*`, so we can delete the associated code.)

* lake update; disable unusedSimpArgs in Batteries

* lkae update aesop

* disable unusedSimpArgs in MathlibTest

* fix grind instance priorities

* comment out MathlibTest/zmod with adaptation note

* touch for CI

* chore: bump to nightly-2025-06-24

* Kick CI

* Bump batteries

* Guessing adaption for leanprover/lean4#8929

* chore: bump to nightly-2025-06-25

* fix: workflow merging master into nightly-testing

* fix

* chore: cache get uses tracking remote

* touch for new CI

* restart CI

* chore: bump to nightly-2025-06-26

* Update lean-toolchain for testing leanprover/lean4#8928

* Teach Mathlib about `mrefine`

* Merge master into nightly-testing

* Update lean-toolchain for testing leanprover/lean4#8980

* chore: update linter warning test outputs

* chore: remove excess line break in deprecation lint now that notes add their own line breaks

* chore: more test cleanup

* .

* cleanup adaptation notes

* fix

* fix

* chore: bump to nightly-2025-06-27

* Merge master into nightly-testing

* Merge master into nightly-testing

* re-enable unusedSimpArgs

* re-enable unusedSimpArgs

* re-enable unusedSimpArgs

* re-enable unusedSimpArgs

* re-enable unusedSimpArgs

* fix tests

* chore: bump to nightly-2025-06-28

* Merge master into nightly-testing

* lintining

* Merge master into nightly-testing

* unused simp args

* chore: bump to nightly-2025-06-29

* chore: adaptations for nightly-2025-06-29

* Merge master into nightly-testing

* chore: robustify `open Mathlib` benchmark

* deprecations

* Update lean-toolchain for testing leanprover/lean4#9086

* Merge master into nightly-testing

* fixes

* chore: bump to nightly-2025-06-30

* lake update

* lake update

* lake update

* lake update

* lake update

* .

---------

Co-authored-by: leanprover-community-mathlib4-bot <leanprover-community-mathlib4-bot@users.noreply.github.com>
Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: Johan Commelin <johan@commelin.net>
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Co-authored-by: Sebastian Ullrich <sebasti@nullri.ch>
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Co-authored-by: Rob23oba <101damnations@github.com>
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Co-authored-by: Kenny Lau <kc_kennylau@yahoo.com.hk>
Co-authored-by: Fabrizio Barroero <fbarroero@gmail.com>
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Co-authored-by: Cameron Zwarich <cameron@lean-fro.org>
Co-authored-by: Mac Malone <mac@lean-fro.org>
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Co-authored-by: Joachim Breitner <mail@joachim-breitner.de>
Co-authored-by: Sebastian Graf <sg@lean-fro.org>
Co-authored-by: Joseph Rotella <7482866+jrr6@users.noreply.github.com>

* fix

* fixes

* chore: adaptations for nightly-2025-06-16 (leanprover-community#25994)

* chore: bump to nightly-2025-06-03

* fix

* fix

* Update lean-toolchain for testing leanprover/lean4#8610

* fix

* revert change in `Mathlib.Data.ZMOD.Basic`

* fix Mathlib/Data/List/EditDistance/Estimator.lean

* give specialized simp lemmas higher prio

* simp can prove these

* simp can prove these

* chore: bump to nightly-2025-06-04

* bump toolchain

* Adapt eqns

* Revert "Adapt eqns"

This reverts commit 34f1f7f.

* Simply remove check for now

* fix a bunch

* fixes?

* chore: adaptations for nightly-2025-06-04

* add `simp low` lemma `injOn_of_eq_iff_eq`

* wip

* wip

* wip

* fix

* Trigger CI for leanprover-community/batteries#1220

* Merge master into nightly-testing

* chore: bump to nightly-2025-06-05

* Kick CI

* Bump lean4-cli

* Bump import-graph

* Kick CI

* update lakefile

* chore: use more robust syntax quotation in Shake

* Trigger CI for leanprover/lean4#8419

* Revert "chore: use more robust syntax quotation in Shake"

This reverts commit cd87328.

* fix(Shake): fix import syntax

@Kha this is deliberately using this approach because syntax quotations
are also not robust but for a different reason: they fail to parse the
new versions of the syntax (and do so at run time). And using all the
optional doohickeys will not be future proof. The current setup is
explicitly meant to ping me when there is a syntax change so I can
evaluate the right way to handle it. In this case we want all the
module options to be ignored (treated the same as a regular import
for the purpose of dependency tracking), we don't want to fail.

* cleanup lakefile

* chore: bump to nightly-2025-06-06

* Update lean-toolchain for testing leanprover/lean4#8653

* fix

* how did this get dropped?!?!

* chore: bump to nightly-2025-06-07

* chore: bump to nightly-2025-06-08

* chore: bump to nightly-2025-06-09

* fix lakefile

* fix lint-style for new Lean.Options API

* chore: bump to nightly-2025-06-10

* chore: bump to nightly-2025-06-09

* merge lean-pr-testing-4

* chore: bump to nightly-2025-06-11

* chore: adaptations for nightly-2025-06-11

* Update Shake/Main.lean

Co-authored-by: Johan Commelin <johan@commelin.net>

* Apply suggestions from code review

* revert

* chore: adaptations for nightly-2025-06-11

* cleanup grind tests

* chore: bump to nightly-2025-06-12

* merge lean-pr-testing-8419

* chore: bump to nightly-2025-06-12

* merge lean-pr-testing-8653

* adaptation note

* oops

* chore: adaptations for nightly-2025-06-12

* remove nolint simpNF

* remove spurious file

* Update lean-toolchain for testing leanprover/lean4#8751

* fix

* chore: bump to nightly-2025-06-13

* Merge master into nightly-testing

* fix

* remove upstreamed

* drop no-op `show`

* chore: bump to nightly-2025-06-14

* chore: bump to nightly-2025-06-15

* intentionally left blank

* fix tests

* chore: bump to nightly-2025-06-16

* fix upstream

* fix

* fix

* fixes

---------

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Co-authored-by: github-actions <github-actions@github.com>
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Co-authored-by: Kim Morrison <kim@tqft.net>
Co-authored-by: Joachim Breitner <mail@joachim-breitner.de>
Co-authored-by: Mario Carneiro <di.gama@gmail.com>
Co-authored-by: sgouezel <sebastien.gouezel@univ-rennes1.fr>
Co-authored-by: Kyle Miller <kmill31415@gmail.com>

* chore: adaptations for nightly-2025-06-16

* chore: bump to nightly-2025-06-17

* fixes

* more fixes

* fixes!

* more fixes!

* hmm

* chore: adaptations for nightly-2025-06-17

* chore: adaptations for nightly-2025-06-17 (leanprover-community#26043)

* revert change in `Mathlib.Data.ZMOD.Basic`

* fix Mathlib/Data/List/EditDistance/Estimator.lean

* give specialized simp lemmas higher prio

* simp can prove these

* simp can prove these

* chore: bump to nightly-2025-06-04

* bump toolchain

* Adapt eqns

* Revert "Adapt eqns"

This reverts commit 34f1f7f.

* Simply remove check for now

* fix a bunch

* fixes?

* chore: adaptations for nightly-2025-06-04

* add `simp low` lemma `injOn_of_eq_iff_eq`

* wip

* wip

* wip

* fix

* Trigger CI for leanprover-community/batteries#1220

* Merge master into nightly-testing

* chore: bump to nightly-2025-06-05

* Kick CI

* Bump lean4-cli

* Bump import-graph

* Kick CI

* update lakefile

* chore: use more robust syntax quotation in Shake

* Trigger CI for leanprover/lean4#8419

* Revert "chore: use more robust syntax quotation in Shake"

This reverts commit cd87328.

* fix(Shake): fix import syntax

@Kha this is deliberately using this approach because syntax quotations
are also not robust but for a different reason: they fail to parse the
new versions of the syntax (and do so at run time). And using all the
optional doohickeys will not be future proof. The current setup is
explicitly meant to ping me when there is a syntax change so I can
evaluate the right way to handle it. In this case we want all the
module options to be ignored (treated the same as a regular import
for the purpose of dependency tracking), we don't want to fail.

* cleanup lakefile

* chore: bump to nightly-2025-06-06

* Update lean-toolchain for testing leanprover/lean4#8653

* fix

* how did this get dropped?!?!

* chore: bump to nightly-2025-06-07

* chore: bump to nightly-2025-06-08

* chore: bump to nightly-2025-06-09

* fix lakefile

* fix lint-style for new Lean.Options API

* chore: bump to nightly-2025-06-10

* chore: bump to nightly-2025-06-09

* merge lean-pr-testing-4

* chore: bump to nightly-2025-06-11

* chore: adaptations for nightly-2025-06-11

* Update Shake/Main.lean

Co-authored-by: Johan Commelin <johan@commelin.net>

* Apply suggestions from code review

* revert

* chore: adaptations for nightly-2025-06-11

* cleanup grind tests

* chore: bump to nightly-2025-06-12

* merge lean-pr-testing-8419

* chore: bump to nightly-2025-06-12

* merge lean-pr-testing-8653

* adaptation note

* oops

* chore: adaptations for nightly-2025-06-12

* remove nolint simpNF

* remove spurious file

* Update lean-toolchain for testing leanprover/lean4#8751

* fix

* chore: bump to nightly-2025-06-13

* Merge master into nightly-testing

* fix

* remove upstreamed

* drop no-op `show`

* chore: bump to nightly-2025-06-14

* chore: bump to nightly-2025-06-15

* intentionally left blank

* fix tests

* chore: bump to nightly-2025-06-16

* fix upstream

* fix

* fix

* fixes

* chore: adaptations for nightly-2025-06-16

* chore: bump to nightly-2025-06-17

* fixes

* more fixes

* fixes!

* more fixes!

* hmm

* chore: adaptations for nightly-2025-06-17

---------

Co-authored-by: Jovan Gerbscheid <jovan.gerbscheid@gmail.com>
Co-authored-by: leanprover-community-mathlib4-bot <leanprover-community-mathlib4-bot@users.noreply.github.com>
Co-authored-by: Johan Commelin <johan@commelin.net>
Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: Kim Morrison <kim@tqft.net>
Co-authored-by: Joachim Breitner <mail@joachim-breitner.de>
Co-authored-by: mathlib4-bot <github-mathlib4-bot@leanprover.zulipchat.com>
Co-authored-by: Sebastian Ullrich <sebasti@nullri.ch>
Co-authored-by: Mario Carneiro <di.gama@gmail.com>
Co-authored-by: sgouezel <sebastien.gouezel@univ-rennes1.fr>
Co-authored-by: Kyle Miller <kmill31415@gmail.com>
Co-authored-by: Rob23oba <robin.arnez@web.de>

* chore: adaptations for nightly-2025-06-17

* chore: lint `show` (adaptation for leanprover/lean4#7395) (leanprover-community#25749)

Adds `show` as an exception to the unused tactic linter and adds a separate linter for `show`s that should be replaced by `change`.
Context: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/unused.20tactic.20linter.20for.20.60show.60/with/523701633

Co-authored-by: Christian Merten <christian@merten.dev>
Co-authored-by: Kenny Lau <kc_kennylau@yahoo.com.hk>
Co-authored-by: Fabrizio Barroero <fbarroero@gmail.com>
Co-authored-by: Rob23oba <robin.arnez@web.de>
Co-authored-by: leanprover-community-mathlib4-bot <leanprover-community-mathlib4-bot@users.noreply.github.com>
Co-authored-by: Rob23oba <152706811+Rob23oba@users.noreply.github.com>
Co-authored-by: Kim Morrison <kim@tqft.net>

* Update lean-toolchain for testing leanprover/lean4#8577

* chore: bump to nightly-2025-06-18

* chore: adaptations for nightly-2025-06-18

* Merge master into nightly-testing

* Update lean-toolchain for testing leanprover/lean4#8804

* Update lean-toolchain for testing leanprover/lean4#8699

* bump Qq and batteries

* meta adaptations

* bump aesop

* fix

* fix (adaptation note)

* Update lean-toolchain for leanprover/lean4#8699

* shake

* chore: adaptations for nightly-2025-06-18 (leanprover-community#26077)

* bump toolchain

* Adapt eqns

* Revert "Adapt eqns"

This reverts commit 34f1f7f.

* Simply remove check for now

* fix a bunch

* fixes?

* chore: adaptations for nightly-2025-06-04

* add `simp low` lemma `injOn_of_eq_iff_eq`

* wip

* wip

* wip

* fix

* Trigger CI for leanprover-community/batteries#1220

* Merge master into nightly-testing

* chore: bump to nightly-2025-06-05

* Kick CI

* Bump lean4-cli

* Bump import-graph

* Kick CI

* update lakefile

* chore: use more robust syntax quotation in Shake

* Trigger CI for leanprover/lean4#8419

* Revert "chore: use more robust syntax quotation in Shake"

This reverts commit cd87328.

* fix(Shake): fix import syntax

@Kha this is deliberately using this approach because syntax quotations
are also not robust but for a different reason: they fail to parse the
new versions of the syntax (and do so at run time). And using all the
optional doohickeys will not be future proof. The current setup is
explicitly meant to ping me when there is a syntax change so I can
evaluate the right way to handle it. In this case we want all the
module options to be ignored (treated the same as a regular import
for the purpose of dependency tracking), we don't want to fail.

* cleanup lakefile

* chore: bump to nightly-2025-06-06

* Update lean-toolchain for testing leanprover/lean4#8653

* fix

* how did this get dropped?!?!

* chore: bump to nightly-2025-06-07

* chore: bump to nightly-2025-06-08

* chore: bump to nightly-2025-06-09

* fix lakefile

* fix lint-style for new Lean.Options API

* chore: bump to nightly-2025-06-10

* chore: bump to nightly-2025-06-09

* merge lean-pr-testing-4

* chore: bump to nightly-2025-06-11

* chore: adaptations for nightly-2025-06-11

* Update Shake/Main.lean

Co-authored-by: Johan Commelin <johan@commelin.net>

* Apply suggestions from code review

* revert

* chore: adaptations for nightly-2025-06-11

* cleanup grind tests

* chore: bump to nightly-2025-06-12

* merge lean-pr-testing-8419

* chore: bump to nightly-2025-06-12

* merge lean-pr-testing-8653

* adaptation note

* oops

* chore: adaptations for nightly-2025-06-12

* remove nolint simpNF

* remove spurious file

* Update lean-toolchain for testing leanprover/lean4#8751

* fix

* chore: bump to nightly-2025-06-13

* Merge master into nightly-testing

* fix

* remove upstreamed

* drop no-op `show`

* chore: bump to nightly-2025-06-14

* chore: bump to nightly-2025-06-15

* intentionally left blank

* fix tests

* chore: bump to nightly-2025-06-16

* fix upstream

* fix

* fix

* fixes

* chore: adaptations for nightly-2025-06-16

* chore: bump to nightly-2025-06-17

* fixes

* more fixes

* fixes!

* more fixes!

* hmm

* chore: adaptations for nightly-2025-06-17

* chore: adaptations for nightly-2025-06-17

* chore: lint `show` (adaptation for leanprover/lean4#7395) (leanprover-community#25749)

Adds `show` as an exception to the unused tactic linter and adds a separate linter for `show`s that should be replaced by `change`.
Context: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/unused.20tactic.20linter.20for.20.60show.60/with/523701633

Co-authored-by: Christian Merten <christian@merten.dev>
Co-authored-by: Kenny Lau <kc_kennylau@yahoo.com.hk>
Co-authored-by: Fabrizio Barroero <fbarroero@gmail.com>
Co-authored-by: Rob23oba <robin.arnez@web.de>
Co-authored-by: leanprover-community-mathlib4-bot <leanprover-community-mathlib4-bot@users.noreply.github.com>
Co-authored-by: Rob23oba <152706811+Rob23oba@users.noreply.github.com>
Co-authored-by: Kim Morrison <kim@tqft.net>

* chore: bump to nightly-2025-06-18

* chore: adaptations for nightly-2025-06-18

---------

Co-authored-by: leanprover-community-mathlib4-bot <leanprover-community-mathlib4-bot@users.noreply.github.com>
Co-authored-by: Kim Morrison <kim@tqft.net>
Co-authored-by: Joachim Breitner <mail@joachim-breitner.de>
Co-authored-by: mathlib4-bot <github-mathlib4-bot@leanprover.zulipchat.com>
Co-authored-by: Johan Commelin <johan@commelin.net>
Co-authored-by: Jovan Gerbscheid <jovan.gerbscheid@gmail.com>
Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: Sebastian Ullrich <sebasti@nullri.ch>
Co-authored-by: Mario Carneiro <di.gama@gmail.com>
Co-authored-by: sgouezel <sebastien.gouezel@univ-rennes1.fr>
Co-authored-by: Kyle Miller <kmill31415@gmail.com>
Co-authored-by: Rob23oba <robin.arnez@web.de>
Co-authored-by: Rob23oba <101damnations@github.com>
Co-authored-by: Christian Merten <christian@merten.dev>
Co-authored-by: Kenny Lau <kc_kennylau@yahoo.com.hk>
Co-authored-by: Fabrizio Barroero <fbarroero@gmail.com>
Co-authored-by: Rob23oba <152706811+Rob23oba@users.noreply.github.com>

* chore: bump to nightly-2025-06-19

* feat: add algebra shims for Grind.Nat/IntModule (leanprover-community#26133)

This PR adds shims so `grind` will understand Mathlib's `AddCommMonoid` and `AddCommGroup`. (Subsequent shims will connect up the order structures for modules and rings.)

* fix

* Update lean-toolchain for leanprover/lean4#8699

* fix: correct memoFix's use of unsafe code

* fix: adjust noncomputable annotations for new compiler

* fix: replace use of `open private _ in` with `open private _ from`

The implementation of `open private _ from` relies on specific
internals of the old compiler and will no longer work.

* remove mul_hmul

* chore: adjust one maxHeartbeats for the new compiler

* linter

* feat: generalize grind algebra shims (leanprover-community#26131)

This PR extends the shims converting from Mathlib to `Lean.Grind` typeclasses, now that `grind` knows about (non-commutative)-(semi)-rings.

* chore: bump to nightly-2025-06-20

* chore: adaptations for nightly-2025-06-20

* chore: adaptations for nightly-2025-06-20 (leanprover-community#26209)

* Trigger CI for leanprover-community/batteries#1220

* Merge master into nightly-testing

* chore: bump to nightly-2025-06-05

* Kick CI

* Bump lean4-cli

* Bump import-graph

* Kick CI

* update lakefile

* chore: use more robust syntax quotation in Shake

* Trigger CI for leanprover/lean4#8419

* Revert "chore: use more robust syntax quotation in Shake"

This reverts commit cd87328.

* fix(Shake): fix import syntax

@Kha this is deliberately using this approach because syntax quotations
are also not robust but for a different reason: they fail to parse the
new versions of the syntax (and do so at run time). And using all the
optional doohickeys will not be future proof. The current setup is
explicitly meant to ping me when there is a syntax change so I can
evaluate the right way to handle it. In this case we want all the
module options to be ignored (treated the same as a regular import
for the purpose of dependency tracking), we don't want to fail.

* cleanup lakefile

* chore: bump to nightly-2025-06-06

* Update lean-toolchain for testing leanprover/lean4#8653

* fix

* how did this get dropped?!?!

* chore: bump to nightly-2025-06-07

* chore: bump to nightly-2025-06-08

* chore: bump to nightly-2025-06-09

* fix lakefile

* fix lint-style for new Lean.Options API

* chore: bump to nightly-2025-06-10

* chore: bump to nightly-2025-06-09

* merge lean-pr-testing-4

* chore: bump to nightly-2025-06-11

* chore: adaptations for nightly-2025-06-11

* Update Shake/Main.lean

Co-authored-by: Johan Commelin <johan@commelin.net>

* Apply suggestions from code review

* revert

* chore: adaptations for nightly-2025-06-11

* cleanup grind tests

* chore: bump to nightly-2025-06-12

* merge lean-pr-testing-8419

* chore: bump to nightly-2025-06-12

* merge lean-pr-testing-8653

* adaptation note

* oops

* chore: adaptations for nightly-2025-06-12

* remove nolint simpNF

* remove spurious file

* Update lean-toolchain for testing leanprover/lean4#8751

* fix

* chore: bump to nightly-2025-06-13

* Merge master into nightly-testing

* fix

* remove upstreamed

* drop no-op `show`

* chore: bump to nightly-2025-06-14

* chore: bump to nightly-2025-06-15

* intentionally left blank

* fix tests

* chore: bump to nightly-2025-06-16

* fix upstream

* fix

* fix

* fixes

* chore: adaptations for nightly-2025-06-16

* chore: bump to nightly-2025-06-17

* fixes

* more fixes

* fixes!

* more fixes!

* hmm

* chore: adaptations for nightly-2025-06-17

* chore: adaptations for nightly-2025-06-17

* chore: lint `show` (adaptation for leanprover/lean4#7395) (leanprover-community#25749)

Adds `show` as an exception to the unused tactic linter and adds a separate linter for `show`s that should be replaced by `change`.
Context: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/unused.20tactic.20linter.20for.20.60show.60/with/523701633

Co-authored-by: Christian Merten <christian@merten.dev>
Co-authored-by: Kenny Lau <kc_kennylau@yahoo.com.hk>
Co-authored-by: Fabrizio Barroero <fbarroero@gmail.com>
Co-authored-by: Rob23oba <robin.arnez@web.de>
Co-authored-by: leanprover-community-mathlib4-bot <leanprover-community-mathlib4-bot@users.noreply.github.com>
Co-authored-by: Rob23oba <152706811+Rob23oba@users.noreply.github.com>
Co-authored-by: Kim Morrison <kim@tqft.net>

* chore: bump to nightly-2025-06-18

* chore: adaptations for nightly-2025-06-18

* Merge master into nightly-testing

* chore: bump to nightly-2025-06-19

* fix

* remove mul_hmul

* linter

* chore: bump to nightly-2025-06-20

* chore: adaptations for nightly-2025-06-20

---------

Co-authored-by: leanprover-community-mathlib4-bot <leanprover-community-mathlib4-bot@users.noreply.github.com>
Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: Joachim Breitner <mail@joachim-breitner.de>
Co-authored-by: Kim Morrison <kim@tqft.net>
Co-authored-by: Sebastian Ullrich <sebasti@nullri.ch>
Co-authored-by: mathlib4-bot <github-mathlib4-bot@leanprover.zulipchat.com>
Co-authored-by: Mario Carneiro <di.gama@gmail.com>
Co-authored-by: Johan Commelin <johan@commelin.net>
Co-authored-by: sgouezel <sebastien.gouezel@univ-rennes1.fr>
Co-authored-by: Kyle Miller <kmill31415@gmail.com>
Co-authored-by: Rob23oba <robin.arnez@web.de>
Co-authored-by: Rob23oba <101damnations@github.com>
Co-authored-by: Christian Merten <christian@merten.dev>
Co-authored-by: Kenny Lau <kc_kennylau@yahoo.com.hk>
Co-authored-by: Fabrizio Barroero <fbarroero@gmail.com>
Co-authored-by: Rob23oba <152706811+Rob23oba@users.noreply.github.com>

* Update lean-toolchain for testing leanprover/lean4#8914

* chore: bump to nightly-2025-06-21

* fix

* fixes

* fixes

* fixes

* updated lake manifest

* comment out tests

* chore: fix for nightly-testing (leanprover-community#26246)

* fix

* fix

* fix grind typeclasses

* chore: adaptations for nightly-2025-06-20

* lake update

* Update lean-toolchain for leanprover/lean4#8914

* fix grind instance

* chore: bump to nightly-2025-06-22

* chore: bump to nightly-2025-06-23

* chore: rm unused `Lean.Util.Paths` import & use updated batteries

* Ensure we checkout mathlib4 master, not nightly-testing master (which does not exist)

* merge lean-pr-testing-8804

* Bump dependencies and silence linter.

* Fixes

(Now `elabSimpArgs` already handles `*`, so we can delete the associated code.)

* lake update; disable unusedSimpArgs in Batteries

* lkae update aesop

* disable unusedSimpArgs in MathlibTest

* fix grind instance priorities

* comment out MathlibTest/zmod with adaptation note

* touch for CI

* chore: bump to nightly-2025-06-24

* Kick CI

* Bump batteries

* Guessing adaption for leanprover/lean4#8929

* chore: bump to nightly-2025-06-25

* fix: workflow merging master into nightly-testing

* fix

* chore: cache get uses tracking remote

* touch for new CI

* restart CI

* chore: bump to nightly-2025-06-26

* Update lean-toolchain for testing leanprover/lean4#8928

* Teach Mathlib about `mrefine`

* Merge master into nightly-testing

* Update lean-toolchain for testing leanprover/lean4#8980

* chore: update linter warning test outputs

* chore: remove excess line break in deprecation lint now that notes add their own line breaks

* chore: more test cleanup

* .

* cleanup adaptation notes

* fix

* fix

* chore: bump to nightly-2025-06-27

* chore: adaptations for nightly-2025-06-26 (#2)

* Merge master into nightly-testing

* Merge master into nightly-testing

* re-enable unusedSimpArgs

* re-enable unusedSimpArgs

* re-enable unusedSimpArgs

* re-enable unusedSimpArgs

* re-enable unusedSimpArgs

* chore: adaptations for nightly-2025-06-27 (#3)

* fix tests

* chore: bump to nightly-2025-06-28

* Merge master into nightly-testing

* lintining

* Merge master into nightly-testing

* unused simp args

* chore: bump to nightly-2025-06-29

* chore: adaptations for nightly-2025-06-29

* chore: adaptations for nightly-2025-06-28 (#5)

* chore: bump to nightly-2025-06-11

* chore: adaptations for nightly-2025-06-11

* Update Shake/Main.lean

Co-authored-by: Johan Commelin <johan@commelin.net>

* Apply suggestions from code review

* revert

* chore: adaptations for nightly-2025-06-11

* cleanup grind tests

* chore: bump to nightly-2025-06-12

* merge lean-pr-testing-8419

* chore: bump to nightly-2025-06-12

* merge lean-pr-testing-8653

* adaptation note

* oops

* chore: adaptations for nightly-2025-06-12

* remove nolint simpNF

* remove spurious file

* Update lean-toolchain for testing leanprover/lean4#8751

* fix

* chore: bump to nightly-2025-06-13

* Merge master into nightly-testing

* fix

* remove upstreamed

* drop no-op `show`

* chore: bump to nightly-2025-06-14

* chore: bump to nightly-2025-06-15

* intentionally left blank

* fix tests

* chore: bump to nightly-2025-06-16

* fix upstream

* fix

* fix

* fixes

* chore: adaptations for nightly-2025-06-16

* chore: bump to nightly-2025-06-17

* fixes

* more fixes

* fixes!

* more fixes!

* hmm

* chore: adaptations for nightly-2025-06-17

* chore: adaptations for nightly-2025-06-17

* chore: lint `show` (adaptation for leanprover/lean4#7395) (leanprover-community#25749)

Adds `show` as an exception to the unused tactic linter and adds a separate linter for `show`s that should be replaced by `change`.
Context: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/unused.20tactic.20linter.20for.20.60show.60/with/523701633

Co-authored-by: Christian Merten <christian@merten.dev>
Co-authored-by: Kenny Lau <kc_kennylau@yahoo.com.hk>
Co-authored-by: Fabrizio Barroero <fbarroero@gmail.com>
Co-authored-by: Rob23oba <robin.arnez@web.de>
Co-authored-by: leanprover-community-mathlib4-bot <leanprover-community-mathlib4-bot@users.noreply.github.com>
Co-authored-by: Rob23oba <152706811+Rob23oba@users.noreply.github.com>
Co-authored-by: Kim Morrison <kim@tqft.net>

* Update lean-toolchain for testing leanprover/lean4#8577

* chore: bump to nightly-2025-06-18

* chore: adaptations for nightly-2025-06-18

* Merge master into nightly-testing

* Update lean-toolchain for testing leanprover/lean4#8804

* Update lean-toolchain for testing leanprover/lean4#8699

* bump Qq and batteries

* meta adaptations

* bump aesop

* fix

* fix (adaptation note)

* Update lean-toolchain for leanprover/lean4#8699

* shake

* chore: bump to nightly-2025-06-19

* fix

* Update lean-toolchain for leanprover/lean4#8699

* fix: correct memoFix's use of unsafe code

* fix: adjust noncomputable annotations for new compiler

* fix: replace use of `open private _ in` with `open private _ from`

The implementation of `open private _ from` relies on specific
internals of the old compiler and will no longer work.

* remove mul_hmul

* chore: adjust one maxHeartbeats for the new compiler

* linter

* chore: bump to nightly-2025-06-20

* chore: adaptations for nightly-2025-06-20

* Update lean-toolchain for testing leanprover/lean4#8914

* chore: bump to nightly-2025-06-21

* fix

* fixes

* fixes

* fixes

* updated lake manifest

* comment out tests

* chore: fix for nightly-testing (leanprover-community#26246)

* fix

* fix

* fix grind typeclasses

* chore: adaptations for nightly-2025-06-20

* lake update

* Update lean-toolchain for leanprover/lean4#8914

* fix grind instance

* chore: bump to nightly-2025-06-22

* chore: bump to nightly-2025-06-23

* chore: rm unused `Lean.Util.Paths` import & use updated batteries

* Ensure we checkout mathlib4 master, not nightly-testing master (which does not exist)

* merge lean-pr-testing-8804

* Bump dependencies and silence linter.

* Fixes

(Now `elabSimpArgs` already handles `*`, so we can delete the associated code.)

* lake update; disable unusedSimpArgs in Batteries

* lkae update aesop

* disable unusedSimpArgs in MathlibTest

* fix grind instance priorities

* comment out MathlibTest/zmod with adaptation note

* touch for CI

* chore: bump to nightly-2025-06-24

* Kick CI

* Bump batteries

* Guessing adaption for leanprover/lean4#8929

* chore: bump to nightly-2025-06-25

* fix: workflow merging master into nightly-testing

* fix

* chore: cache get uses tracking remote

* touch for new CI

* restart CI

* chore: bump to nightly-2025-06-26

* Update lean-toolchain for testing leanprover/lean4#8928

* Teach Mathlib about `mrefine`

* Merge master into nightly-testing

* Update lean-toolchain for testing leanprover/lean4#8980

* chore: update linter warning test outputs

* chore: remove excess line break in deprecation lint now that notes add their own line breaks

* chore: more test cleanup

* .

* cleanup adaptation notes

* fix

* fix

* chore: bump to nightly-2025-06-27

* Merge master into nightly-testing

* Merge master into nightly-testing

* re-enable unusedSimpArgs

* re-enable unusedSimpArgs

* re-enable unusedSimpArgs

* re-enable unusedSimpArgs

* re-enable unusedSimpArgs

* fix tests

* chore: bump to nightly-2025-06-28

* Merge master into nightly-testing

* lintining

* lint

---------

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* Merge master into nightly-testing

* chore: robustify `open Mathlib` benchmark

* deprecations

* Update lean-toolchain for testing leanprover/lean4#9086

* Merge master into nightly-testing

* fixes

* chore: bump to nightly-2025-06-30

* lake update

* lake update

* lake update

* lake update

* lake update

* .

* Merge master into nightly-testing

* Merge master into nightly-testing

* Merge master into nightly-testing

* Merge master into nightly-testing

* cleanup

* unusedSimpArgs

* bump toolchain

* lake update

* Merge master into nightly-testing

* Merge master into nightly-testing

* chore: adaptations for nightly-2025-07-01

* add adaptation note

* add adaptation note

* chore: bump to nightly-2025-07-02

* fixes

* Merge master into nightly-testing

* fixes

* update test output

* Merge master into nightly-testing

* Merge master into nightly-testing

* chore: bump to nightly-2025-07-03

* chore: adaptations for nightly-2025-07-03

---------

Co-authored-by: leanprover-community-mathlib4-bot <leanprover-community-mathlib4-bot@users.noreply.github.com>
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Co-authored-by: Sebastian Graf <sg@lean-fro.org>
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