clippy::borrowed_box shouldn't warn on return type

Summary

This function should be fine as the return type not only derefs to &[Item] but also allow more operations than just &[Item]:

fn inner(&self) -> &'_ Box<[Item]> {
    &self.0
}

Lint Name

borrowed_box

Reproducer

I tried this code:

fn inner(&self) -> &'_ Box<[Item]> {
    &self.0
}

I saw this happen:

you seem to be trying to use `&Box<T>`. Consider using just `&T`
for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#borrowed_box
`#[warn(clippy::borrowed_box)]` on by default

I expected to see this happen:

No warnings

Version

rustc 1.70.0 (90c541806 2023-05-31)
binary: rustc
commit-hash: 90c541806f23a127002de5b4038be731ba1458ca
commit-date: 2023-05-31
host: x86_64-unknown-linux-gnu
release: 1.70.0
LLVM version: 16.0.2

Additional Labels

No response

Start by locating the borrowed_box lint and its existing test coverage, then reproduce the reported return-type example. Check the lint's handling of borrowed Box<[Item]> return types and verify that the example produces no warning when the change is complete.