Linter suggestion breaks compilation

[zakarumych]

I define #![deny(rust_2018_idioms)] which implies #![deny(unreachable_pub)] and I got linter complaining about the pub use inside private module while I reexport the symbol at crate level.

Here is a small example of what I'm talking about

Looks ok. Let's do what linter suggests - change pub to pub(crate) and...
Get compilation error with 'Bar is private'

Here is how it looks like

What is the correct way to export Bar in example? My guess is that second variant is correct, hence linter is correct as well, and the bug is in visibility system somewhere in rustc. But I'm not an expert here.

[zackmdavis]

The unreachable-pub lint was removed from the 2018-idioms lint group in #52926 because it suffers from the bugs #47816 (which is the cause of the problem in your first example) and #52665, but this change won't be in stable until 1.29 (13 September). Until we have a release candidate, the nightly toolchain might be a better choice for testing out edition-2018 features.