Consider splitting unused_import's glob re-export visibility warning into its own lint

[arifd]

Code

mod foo {
    pub use bar::*;
    mod bar {
        pub(crate) fn baz() {}
    }
}

fn main() {
    foo::baz();
}

Current output

warning: glob import doesn't reexport anything because no candidate is public enough
 --> src/main.rs:2:13
  |
2 |     pub use bar::*;
  |             ^^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

Desired output

No response

Rationale and extra context

An unused import lint feels wrong to be because i am using baz.

Other cases

No response

Rust Version

rustc 1.75.0 (82e1608df 2023-12-21)
binary: rustc
commit-hash: 82e1608dfa6e0b5569232559e3d385fea5a93112
commit-date: 2023-12-21
host: aarch64-apple-darwin
release: 1.75.0
LLVM version: 17.0.6

Anything else?

No response

[workingjubilee]

cc

• Policy for lint expansions #122759
• "item TryFrom is imported redundantly" doesn't have automatic fix #121315
• Display the reasons for the unused imports. #117129

Not an exact duplicate but is related.

[workingjubilee]

Gonna call this one a bug because it seems simply incorrect in this case, yeah. 🤔

[petrochenkov]

This was addressed recently, the message and suggestion on nightly is different.

warning: glob import doesn't reexport anything with visibility `pub` because no imported item is public enough
 --> src/main.rs:2:13
  |
2 |     pub use bar::*;
  |             ^^^^^^
  |
note: the most public imported item is `pub(crate)`
 --> src/main.rs:2:13
  |
2 |     pub use bar::*;
  |             ^^^^^^
  = help: reduce the glob import's visibility or increase visibility of imported items
  = note: `#[warn(unused_imports)]` on by default

[arifd]

That is much better, as I can see now it'sbar whose pub export is triggering the "unused", rather than baz which is patently being used. (Although that second code example??)

It's still wrong to me that the lint this falls under the category called "unused imports" but if it's one of those unfortunate grey areas that just doesn't have a nice solution. I'm happy enough to close this.