Usage of safe decl macros that contain unsafe trigger unsafe_derive_deserialize

[conradludgate]

Summary

This is similar to #13062.

In 1.88 (beta), the core::pin::pin macro now contains unsafe code in the expansion (rust-lang/rust#139114).
This macro is widely used in async code, likewise so is serde::Deserialize. This means that false positives are now extremely likely

Lint Name

unsafe_derive_deserialize

Reproducer

I tried this code:

#![deny(clippy::unsafe_derive_deserialize)]

#[derive(serde::Deserialize)]
struct Foo;

impl Foo {
    fn foo(&self) {
        std::pin::pin!(());
    }
}

I saw this happen:

error: you are deriving `serde::Deserialize` on a type that has methods using `unsafe`
 --> src/lib.rs:3:10
  |
3 | #[derive(serde::Deserialize)]
  |          ^^^^^^^^^^^^^^^^^^
  |
  = help: consider implementing `serde::Deserialize` manually. See https://serde.rs/impl-deserialize.html
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unsafe_derive_deserialize
note: the lint level is defined here
 --> src/lib.rs:1:9
  |
1 | #![deny(clippy::unsafe_derive_deserialize)]
  |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  = note: this error originates in the derive macro `serde::Deserialize` (in Nightly builds, run with -Z macro-backtrace for more info)

I expected to see this happen:

No error

Version

rustc 1.88.0-beta.7 (32084cfdf 2025-06-21)
binary: rustc
commit-hash: 32084cfdf602196490b40bb7c95ca9291c42d0cb
commit-date: 2025-06-21
host: aarch64-apple-darwin
release: 1.88.0-beta.7
LLVM version: 20.1.5

Additional Labels

No response