New lint `map_all_any_identity`

[samueltardieu]

This lint has been inspired by code encountered in Clippy itself (see the first commit).

changelog: [map_all_any_identity]: new lint

[rustbot]

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[samueltardieu]

r? @xFrednet

[samueltardieu]

@rustbot ready

[bors]

:umbrella: The latest upstream changes (presumably #13437) made this pull request unmergeable. Please resolve the merge conflicts.

[xFrednet]

This version looks good to me, and the FCP should also be over.

Thank you for the implementation!

---

Roses are red, This looks fine, Rebase is pending, Then it's r=me time

[bors]

:v: @samueltardieu, you can now approve this pull request!

If @xFrednet told you to "r=me" after making some further change, please make that change, then do @bors r=@xFrednet

[samueltardieu]

@bors r=@xFrednet

[bors]

:pushpin: Commit 91a1d16a81a30d48b65ce4c63d6a1410e6c98447 has been approved by xFrednet

It is now in the queue for this repository.

[bors]

:hourglass: Testing commit 91a1d16a81a30d48b65ce4c63d6a1410e6c98447 with merge 35a7095d8c440663b1beb77bafb12b0f3d482b43...

[bors]

:sunny: Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test Approved by: xFrednet Pushing 35a7095d8c440663b1beb77bafb12b0f3d482b43 to master...