* Update lean-toolchain for testing leanprover/lean4#8347

* fixes for leanprover/lean4#8347

* Update lean-toolchain for testing leanprover/lean4#8397

* deprecations for leanprover/lean4#8397

* chore: bump to nightly-2025-05-19

* chore: adaptations for nightly-2025-05-19

* Trigger CI for leanprover/lean4#8347

* Update the style linter to use LinterOptions

* Fix test

* chore: adaptations for nightly-2025-05-19 (#25017)



Co-authored-by: Kim Morrison <kim@tqft.net>
Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: mathlib4-bot <github-mathlib4-bot@leanprover.zulipchat.com>
Co-authored-by: Anne C.A. Baanen <vierkantor@vierkantor.com>
Co-authored-by: Sebastian Ullrich <sebasti@nullri.ch>

* chore: bump to nightly-2025-05-20

* Merge master into nightly-testing

* feat: a `grind` test case (#25037)

Adds a test case for `grind` that was previously failing in the presence of Mathlib's typeclass shortcuts. Let's just keep it in Mathlib as a regression test.

Note that this is a PR to `bump/v4.21.0`, as it requires a recent nightly toolchain. (It can still be reviewed and bors'd as any other PR.)

* lake update

* fixes

* fixes

* fixes

* fixes

* fix

* fixes

* fixes

* shake --update

* chore: bump to nightly-2025-05-21

* Update lean-toolchain for testing leanprover/lean4#7352

* lake update

* Trigger CI for leanprover/lean4#7352

* chore: adaptations for nightly-2025-05-21

* chore: adaptations for nightly-2025-05-21 (#25079)



Co-authored-by: mathlib4-bot <github-mathlib4-bot@leanprover.zulipchat.com>
Co-authored-by: leanprover-community-mathlib4-bot <leanprover-community-mathlib4-bot@users.noreply.github.com>
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* chore: adaptations for nightly-2025-05-21

* fix for leanprover/lean4#7352

* remove unneeded List.ofFn_succ from simp sets

* Merge master into nightly-testing

* Merge master into nightly-testing

* Revert "fix for leanprover/lean4#7352"

This reverts commit 38ca408.

* chore: fix some defeq abuse in theorem statements around the `Id` monad (#25098)

Follows on from leanprover/lean4#7352.

This also deprecates:
* `id.mk`, which looks like a porting error
* `Free(Add)(Magma|Semigroup).mul_map_seq`, which is a garbage lemma that both is not meaningfully about the free objects and has defeq abuse everywhere.

* chore: bump to nightly-2025-05-22

* update batteries

* chore: bump to nightly-2025-05-23

* Update lean-toolchain for testing leanprover/lean4#8449

* chore: adaptations for nightly-2025-05-22 (#25110)



Co-authored-by: leanprover-community-mathlib4-bot <leanprover-community-mathlib4-bot@users.noreply.github.com>
Co-authored-by: Kim Morrison <kim@tqft.net>
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* remove now upstreamed `clear_value`

* Update lean-toolchain for testing leanprover/lean4#8457

* chore: update tests for `Format` bug fix

* Trigger CI for leanprover/lean4#8457

* lake update

* lake update

* fixes

* Merge master into nightly-testing

* chore: bump to nightly-2025-05-24

* fix

* chore: adaptations for nightly-2025-05-24 (#25147)



Co-authored-by: Kim Morrison <kim@tqft.net>
Co-authored-by: mathlib4-bot <github-mathlib4-bot@leanprover.zulipchat.com>
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* chore: adaptations for nightly-2025-05-24

* Merge master into nightly-testing

* Update lean-toolchain for testing leanprover/lean4#8470

* chore: bump to nightly-2025-05-25

* chore: adaptations for nightly-2025-05-25

* chore: adaptations for nightly-2025-05-25 (#25184)



Co-authored-by: leanprover-community-mathlib4-bot <leanprover-community-mathlib4-bot@users.noreply.github.com>
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* unsimp `List.getElem?_length`

This is solved using `getElem?_neg` now.

* chore: adaptations for nightly-2025-05-25

* Trigger CI for leanprover/lean4#8470

* chore: bump to nightly-2025-05-26

* lake update

* deprecations

* Trigger CI for leanprover/lean4#8449

* Merge master into nightly-testing

* chore: bump to nightly-2025-05-27

* chore: adaptations for nightly-2025-05-27

* Update lean-toolchain for testing leanprover/lean4#8504

* chore: bump to nightly-2025-05-28

* chore: adaptations for nightly-2025-05-27 (#25234)



Co-authored-by: mathlib4-bot <github-mathlib4-bot@leanprover.zulipchat.com>
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Co-authored-by: Kim Morrison <kim@tqft.net>

* fix

* fix merge

* fix merge again

* deprecations

* deprecations

* fix Archive

* comment out test

* Fix and re-enable directory dependency lint test.

* chore: bump to nightly-2025-05-29

* Use the formatting from the master branch. (Seems to have been a merge that went wrong.)

* lake update

* chore: adaptations for nightly-2025-05-28 (#25295)



Co-authored-by: leanprover-community-mathlib4-bot <leanprover-community-mathlib4-bot@users.noreply.github.com>
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* fix

* Trigger CI for leanprover/lean4#8337

* fixes

* Merge master into nightly-testing

* chore: bump to nightly-2025-05-30

* chore: adaptations for nightly-2025-05-29 (#25306)



Co-authored-by: Kim Morrison <kim@tqft.net>
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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* chore: bump to nightly-2025-05-31

* chore: bump to nightly-2025-06-01

* fix Archive

* chore: adaptations for nightly-2025-06-01 (#25355)



Co-authored-by: leanprover-community-mathlib4-bot <leanprover-community-mathlib4-bot@users.noreply.github.com>
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* chore: bump to nightly-2025-06-02

* chore: adaptations for nightly-2025-06-02 (#25360)



Co-authored-by: Kim Morrison <kim@tqft.net>
Co-authored-by: mathlib4-bot <github-mathlib4-bot@leanprover.zulipchat.com>
Co-authored-by: Anne C.A. Baanen <vierkantor@vierkantor.com>
Co-authored-by: github-actions <github-actions@github.com>

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

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

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

* fix

* fix

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

* fix

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

* bump toolchain

---------

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: github-actions <github-actions@github.com>
Co-authored-by: mathlib4-bot <github-mathlib4-bot@leanprover.zulipchat.com>
Co-authored-by: Anne C.A. Baanen <vierkantor@vierkantor.com>
Co-authored-by: Sebastian Ullrich <sebasti@nullri.ch>
Co-authored-by: Eric Wieser <wieser.eric@gmail.com>
Co-authored-by: Rob23oba <robin.arnez@web.de>
Co-authored-by: Joseph Rotella <7482866+jrr6@users.noreply.github.com>