use strict provenance APIs on nightly

[RalfJung]

This makes hashbrown compatible with strict provenance, which helps Miri in ensuring pointers are used correctly.

Fixes #384

[RalfJung]

Clippy has a bunch of complaints but those are not introduced by this PR.

[RalfJung]

Strangely I don't see any permissive provenance warnings in the CI job for the first commit. Looks like these ZST code paths do not get executed in the test suite. I added a test for one of them, not sure how to reach the other ones.

[Amanieu]

@bors r+

[bors]

📌 Commit 22bddc8 has been approved by Amanieu

It is now in the queue for this repository.

[bors]

🔒 Merge conflict

This pull request and the master branch diverged in a way that cannot be automatically merged. Please rebase on top of the latest master branch, and let the reviewer approve again.

How do I rebase?

Assuming self is your fork and upstream is this repository, you can resolve the conflict following these steps:

1. git checkout strict-provenance (switch to your branch)
2. git fetch upstream master (retrieve the latest master)
3. git rebase upstream/master -p (rebase on top of it)
4. Follow the on-screen instruction to resolve conflicts (check git status if you got lost).
5. git push self strict-provenance --force-with-lease (update this PR)

You may also read Git Rebasing to Resolve Conflicts by Drew Blessing for a short tutorial.

Please avoid the "Resolve conflicts" button on GitHub. It uses git merge instead of git rebase which makes the PR commit history more difficult to read.

Sometimes step 4 will complete without asking for resolution. This is usually due to difference between how Cargo.lock conflict is handled during merge and rebase. This is normal, and you should still perform step 5 to update this PR.

Error message

Auto-merging src/set.rs
Auto-merging src/raw/mod.rs
CONFLICT (content): Merge conflict in src/raw/mod.rs
Automatic merge failed; fix conflicts and then commit the result.

[bors]

☔ The latest upstream changes (presumably #365) made this pull request unmergeable. Please resolve the merge conflicts.

[RalfJung]

@Amanieu I have rebased and resolved the conflicts.

[Amanieu]

@bors r+

[bors]

📌 Commit dd6aceb has been approved by Amanieu

It is now in the queue for this repository.

[bors]

⌛ Testing commit dd6aceb with merge ae3e67b...

[bors]

☀️ Test successful - checks-actions
Approved by: Amanieu
Pushing ae3e67b to master...