Do not lint private-in-public for RPITIT

[cjgillot]

Fixes the hard error introduced by #143357

Instead of trying to accept this hard error directly, this PR copies tests from #144020 and removes the error.

If the behaviour is actually desirable, the second commit can be reverted with a proper crater run.

cc #143531 for bookkeeping

r? @compiler-errors

[petrochenkov]

If the behaviour is actually desirable, the second commit can be reverted with a proper crater run.

Yes, it is actually desirable, and #143357 was a bugfix.

[compiler-errors]

Yeah, let's "fix" this and then re-crater it.

We should be able to detect crater fallout by just diffing the changes from 9c3064e and its parent.

@craterbot run mode=check-only start=master#e9182f195b8505c87c4bd055b9f6e114ccda0981 end=master#9c3064e131f4939cc95a29bb11413c49bbda1491

[craterbot]

👌 Experiment pr-144098 created and queued.
🔍 You can check out the queue and this experiment's details.

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

[compiler-errors]

In the mean time though, let's get this merged.

@bors r+

[bors]

📌 Commit c004a96 has been approved by compiler-errors

It is now in the queue for this repository.

[compiler-errors]

#144139 to make sure we don't forget this