Error suggestions for import contain erroneous derive

[nrc]

E.g.,

error[E0412]: cannot find type `Path` in this scope
  --> src/actions/compiler_message_parsing.rs:77:55
   |
77 | fn make_suggestions(message: &CompilerMessage, file: &Path) -> Vec<Suggestion> {
   |                                                       ^^^^ not found in this scope
   |
help: possible candidates are found in other modules, you can import them into scope
   |
20 | #[derive(use build::rustc::rustc::hir::Path;
   |
20 | #[derive(use build::rustc::syntax::ast::Path;
   |
20 | #[derive(use std::path::Path;

cc @oli-obk

[nrc]

The first non-comment, non-use line in the file is #[derive(Debug)], which might be where this is coming from?

[oli-obk]

No, the first item is inside the expansion. We need a macro check. I don't think Rust's lints have any, but clippy has a convenience function in almost every lint. We should probably upstream it. There are so many diagnostics that choke on expansions.

[nikomatsakis]

Closing as duplicate of #44566.