Latest Clippy tags `unused_imports` on trait imports spuriously

[TheBlueMatt]

Summary

I honestly can't make heads or tails of why, if you remove the import the build fails in several places.

Lint Name

unused_imports

Reproducer

I honestly don't have a clue as to what the issue is here, so a minimal reproducer is hard.
lightningdevkit/rust-lightning#4000 removes the allows that were previously in place, see the last commit.

Version

rustc stable
info: latest update on 2025-08-07, rust version 1.89.0 (29483883e 2025-08-04)

Additional Labels

No response

[samueltardieu]

unused_imports is a compiler lint, not a Clippy lint. It shows when running cargo clippy, but it should also show when running cargo check or cargo build, it is not part of Clippy.

[dunxen]

unused_imports is a compiler lint, not a Clippy lint. It shows when running cargo clippy, but it should also show when running cargo check or cargo build, it is not part of Clippy.

Right, the most relevant issue I found is rust-lang/rust#127852, although that's not related to trait usage in macros, but I imagine it's general enough to mention there.

I think we can close this and leave a comment there.

[Alexendoo]

A new issue would be good since that one is about useing for side effects only