Implementing a trait for a type disables dead_code lint.

[charles-r-earp]

Min example:

trait Zoom {}

struct Foo;
struct Bar;

impl Zoom for Foo {}

https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=f9122e0d0aaecb171c6fded1d8589f19

Warns Bar is unused but not Foo.

Compiling playground v0.0.1 (/playground)
warning: struct `Bar` is never constructed
 --> src/lib.rs:4:8
  |
4 | struct Bar;
  |        ^^^
  |
  = note: `#[warn(dead_code)]` on by default

warning: `playground` (lib) generated 1 warning
    Finished dev [unoptimized + debuginfo] target(s) in 0.34s

[charles-r-earp]

Wrong repo.

[shepmaster]

This was fixed in rust-lang/rust#118257 available in recent nightly builds.