unsafe_derive_deserialize can't be enabled/disabled per struct

[alecmocatta]

clippy::unsafe_derive_deserialize can't be allowed/warned/denied by outer attributes on the struct or its impls. Minor inconvenience but might be worth making one of these allows functional?

#![allow(dead_code, unused_unsafe)]
#![warn(clippy::unsafe_derive_deserialize)]

use serde::Deserialize;

#[allow(clippy::unsafe_derive_deserialize)]
#[derive(Deserialize)]
struct Foo;

#[allow(clippy::unsafe_derive_deserialize)]
impl Foo {
    fn bar(&mut self) {
        let _ = self;
        unsafe {}
    }
}

(Playground)

Clippy:

    Checking playground v0.0.1 (/playground)
warning: you are deriving `serde::Deserialize` on a type that has methods using `unsafe`
 --> src/lib.rs:7:10
  |
7 | #[derive(Deserialize)]
  |          ^^^^^^^^^^^
  |
note: the lint level is defined here
 --> src/lib.rs:2:9
  |
2 | #![warn(clippy::unsafe_derive_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: this warning originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)