`absolute_paths` can trigger on code produced by a macro

[ilyvion]

Summary

It looks like absolute_paths isn't properly "shielded" from macro code as something as simple as deriving serde::Deserialize on any type that holds another type with a generic sets it off.

Lint Name

absolute_paths

Reproducer

I tried this code:

use serde::Deserialize;

#[derive(Debug, Deserialize)]
struct Foo {
    bar: Vec<char>,
}

I saw this happen:

error: consider bringing this path into scope with the `use` keyword
 --> examples\min-repro.rs:9:5
  |
9 |     bar: Vec<char>,
  |     ^^^^^^^^^^^^^^
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#absolute_paths
  = note: `-D clippy::absolute-paths` implied by `-D warnings`
  = help: to override `-D warnings` add `#[allow(clippy::absolute_paths)]`

error: consider bringing this path into scope with the `use` keyword
 --> examples\min-repro.rs:9:5
  |
9 |     bar: Vec<char>,
  |     ^^^^^^^^^^^^^^
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#absolute_paths

I expected to see this happen:

Nothing, obviously. There are no absolute paths in non-macro generated code here.

Version

rustc 1.85.0-nightly (d117b7f21 2024-12-31)
binary: rustc
commit-hash: d117b7f211835282b3b177dc64245fff0327c04c
commit-date: 2024-12-31
host: x86_64-pc-windows-msvc
release: 1.85.0-nightly
LLVM version: 19.1.6

Additional Labels

No response

[Centri3]

It is.. I guess this is more procedural macros weirdness... Or this could very well be a bug in Path's implementation of WithSearchPat.

I see that TypeRelative doesn't check the beginning of the span, which might be why this happens.

[ilyvion]

I don't know if it's the same cause, but since it's a similar problem, I'm wondering if this is a bigger problem than just this one lint.

I'm now also getting a similar problem with Bevy's Reflect macro:

error: this ident consists of a single char
  --> src\atlas_sprites\gizmos.rs:50:35
   |
50 |     #[reflect(Component, Default, Debug)]
   |                                   ^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#min_ident_chars
   = note: requested on the command line with `-D clippy::min-ident-chars`

Code:

use bevy::prelude::*;

#[derive(Component, Reflect, Default, Debug)]
#[reflect(Component, Default, Debug)]
pub struct ShowAtlasSpritesGizmos {
    pub render_text_anchor_point: Option<bool>,
    pub render_character_anchor_point: bool,
    pub render_character_box: bool,
}

[Centri3]

We don't seem to check for procedural macros in min_ident_chars if it is from a pattern. I have a feeling Debug triggers it bc of its f argument. This might be an easy fix.

I'm still kinda unsure why the former happens (it's still probably the bug in WithSearchPat), but I'd recommend opening a separate issue for this one if this is still an issue

(Sorry for the late response :3)