`manual_unwrap_or_default` invalid suggestion on macro expanded code

Summary

manual_unwrap_or_default invalid suggestion on macro expanded code

Reproducer

I tried this code: https://github.com/dj8yfo/clppy_bug/blob/master/src/lib.rs#L1-L10

I expected to see this happen: no clippy suggestion is produced

Instead, this happened:

❯ cargo clippy
warning: if let can be simplified with `.unwrap_or_default()`
 --> src/lib.rs:8:15
  |
8 |     #[darling(skip)]
  |               ^^^^
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_unwrap_or_default
  = note: `#[warn(clippy::manual_unwrap_or_default)]` on by default
help: replace it with
  |
8 ~     #[darling(skip)]
9 ~     bar.unwrap_or_default())]
  |

Version

rustc 1.79.0 (129f3b996 2024-06-10)
binary: rustc
commit-hash: 129f3b9964af4d4a709d1383930ade12dfe7c081
commit-date: 2024-06-10
host: x86_64-unknown-linux-gnu
release: 1.79.0
LLVM version: 18.1.7
KK

Additional Notes

It looks like clippy suggests to change this code inside of darling macro expansion:

        ::darling::export::Ok(Self {
            qux: qux
                .1
                .expect("Uninitialized fields without defaults were already checked"),
            bar: if let Some(__val) = bar.1 {
                __val
            } else {
                ::darling::export::Default::default()
            },
        })

Additional Labels

No response

Start with the linked src/lib.rs reproducer and run cargo clippy to observe the manual_unwrap_or_default warning at the darling attribute. Trace the manual_unwrap_or_default lint and its handling of macro-expanded code. Done means the reproducer no longer receives an invalid suggestion for code generated inside the macro expansion.