Regression on nightly: unused pub(crate) use::*; is not actually unused

[orlp]

I encountered this while trying to bump Rust from nightly-2026-01-09 to nightly-2026-02-01 in Polars. The CI complains:

error: unused import: `polars_plan::prelude`
  --> crates/polars-lazy/src/prelude.rs:17:16
   |
17 | pub(crate) use polars_plan::prelude::*;
   |                ^^^^^^^^^^^^^^^^^^^^

However, this is a false positive, if one removes this line of code the crate fails to compile.

I briefly tried to re-create a minimal example that has the same issue but was unable to.

[ehuss]

Bisecting leads me to believe this is related to #150502 and #150939. The unused warning starts after #150939.

cc @petrochenkov

[petrochenkov]

Minimized:

mod m {
    pub struct S {}
}

use m::*;
pub use m::*; // warning: unused import: `m::*`

This is caused by 227e7bd.

I'll fix this issue (and probably #151124 as well) as a part of extending the ambiguous_import_visibilities lint to glob-vs-glob ambiguities.

[eggyal]

@rustbot label -regression-from-stable-to-nightly +regression-from-nightly-to-nightly -E-needs-mcve

[rustbot]

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[eggyal]

@rustbot label -regression-from-stable-to-nightly -E-needs-mcve