r? @thomcc

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Hey! It looks like you've submitted a new PR for the library teams!

If this PR contains changes to any rust-lang/rust public library APIs then please comment with @rustbot label +T-libs-api -T-libs to tag it appropriately. If this PR contains changes to any unstable APIs please edit the PR description to add a link to the relevant API Change Proposal or create one if you haven't already. If you're unsure where your change falls no worries, just leave it as is and the reviewer will take a look and make a decision to forward on if necessary.

Examples of T-libs-api changes:

• Stabilizing library features
• Introducing insta-stable changes such as new implementations of existing stable traits on existing stable types
• Introducing new or changing existing unstable library APIs (excluding permanently unstable features / features without a tracking issue)
• Changing public documentation in ways that create new stability guarantees
• Changing observable runtime behavior of library APIs

Now sure if I should include these here or make separate PRs, but the following impls would also be useful now but are missing:

• impl BorrowMut<Path> for PathBuf
• impl AsMut<Path> for PathBuf
• impl AsMut<Path> for Path
• impl AsMut<OsStr> for Path
• impl From<&mut Path> for PathBuf
• impl From<&mut OsStr> for PathBuf

Deref from &mut PathBuf to &mut Path seems non-problematic given that the same thing is already expressible less conveniently as:

fn mutate_path_buf(path_buf: &mut PathBuf) {
    let tmp: PathBuf = mem::take(path_buf);
    let mut tmp: Box<Path> = tmp.into_boxed_path();
    mutate_path(&mut *tmp);
    *path_buf = tmp.to_path_buf();
}

fn mutate_path(path: &mut Path) {
    // ...
}

@rust-lang/libs-api:
@rfcbot fcp merge

Team member @dtolnay has proposed to merge this. The next step is review by the rest of the tagged team members:

No concerns currently listed.

Once a majority of reviewers approve (and at most 2 approvals are outstanding), this will enter its final comment period. If you spot a major issue that hasn't been raised at any point in this process, please speak up!

See this document for info about what commands tagged team members can give me.

This is now entering its final comment period, as per the review above.

The final comment period, with a disposition to merge, as per the review above, is now complete.

As the automated representative of the governance process, I would like to thank the author for their work and everyone else who contributed.

This will be merged soon.

@bors r+

Commit 2c54178 has been approved by dtolnay

It is now in the queue for this repository.

Testing commit 2c54178 with merge 9c07efe...

Test successful - checks-actions
Approved by: dtolnay
Pushing 9c07efe to master...

Finished benchmarking commit (9c07efe): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

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