"unused import" could be more helpful ("nothing to export")

[arifd]

Code

mod misc {
    const WOW: usize = 1;
}

pub use misc::*;

Current output

warning: unused import: `misc::*`
 --> src/main.rs:6:9
  |
6 | pub use misc::*;
  |         ^^^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

warning: `playground` (bin "playground") generated 1 warning (run `cargo clippy --fix --bin "playground"` to apply 1 suggestion)

Desired output

Either an additional hint saying why this lint is complaining "There is nothing to export"

Or a new lint or something.

Rationale and extra context

In more complex codebases it's not immediately obvious what the problem is. I'd prefer a message like "nothing to export".

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

[eggyal]

I dont think the issue is or diagnostic should be about what is exported here.

A wildcard use declaration that doesn't actually bind any visible paths should (probably?) error on that ground alone. This, I think, is the issue that needs addressing here.

Irrespective of any wildcard, if a use declaration is unused, that's a different error (the currently displayed one).