Rollup merge of #99026 - anall:buffix/clippy-9131, r=xFrednet

Rollup merge of #99026 - anall:buffix/clippy-9131, r=xFrednet

Add test for and fix rust-lang/rust-clippy#9131

This lint seems to have been broken by #98446 -- but of course, there was no clippy test for this case at the time.

`expr.span.ctxt().outer_expn_data()` now has `MacroKind::Derive` instead of `MacroKind::Attr` for something like:

```
#[derive(Clone, Debug)]
pub struct UnderscoreInStruct {
    _foo: u32,
}
```

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changelog: none

closes: https://github.com/rust-lang/rust-clippy/issues/9131