`missing_const_for_fn` triggers for derives

[CryZe]

Summary

missing_const_for_fn accidentally triggers for code generated by derives which you generally don't have any influence on.

Lint Name

missing_const_for_fn

Reproducer

I tried this code:

Playground

#![warn(clippy::missing_const_for_fn)]

#[derive(Debug, Copy, Clone, bytemuck::Pod, bytemuck::Zeroable)]
#[repr(C)]
struct Header {
    version: u16,
    count: u16,
    storage_offset: u16,
}

I saw this happen:

warning: this could be a `const fn`
 --> src\layout\parser\font_resolving\name.rs:7:1
  |
7 | #[repr(C)]
  | ^
  |
note: the lint level is defined here
 --> src\lib.rs:6:5
  |
6 |     clippy::missing_const_for_fn,
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#missing_const_for_fn

Weirdly the span is a bit different on the playground.

I expected to see this happen:

The lint shouldn't trigger. Also even if it would trigger, the span is somehow on the repr and not on the derive.

Version

rustc 1.61.0 (fe5b13d68 2022-05-18)
binary: rustc
commit-hash: fe5b13d681f25ee6474be29d748c65adcd91f69e
commit-date: 2022-05-18
host: x86_64-pc-windows-msvc
release: 1.61.0
LLVM version: 14.0.0

Additional Labels

No response