Auto Import not working with derive_more proc macros

[homchom]

This is not a duplicate of #6183 because

1. the import resolves.
2. procMacro.enable is set to true.

---

rust-analyzer version: 0.3.1983-standalone (7852a4c 2024-06-02)

rustc version: 1.78.0 (9b00956e5 2024-04-29)

editor or extension: VSCode

relevant settings:

• "rust-analyzer.completion.autoimport": true
• "rust-analyzer.procMacro.enable": true

to reproduce:

1. Create a new library crate project with dependencies derive_more and parse-display.
2. In lib.rs, define the following struct:

struct Example(i32);

3. Add #[derive(Display)] on the line above. While typing, observe that Auto Import correctly suggests parse_display::Display. Remove the derive attribute.
4. Add #[derive(From)] on the line above the struct definition. While typing, observe that Auto Import does not suggest derive_more::From.
5. To fix the error, replace From with derive_more::From. Observe that the macro resolves and the code compiles.

[Veykril]

LIkely due to the collision of the From trait in the prelude, r-a doesn't handle those well for auto imports yet iirc

[mathew-horner]

@rustbot claim

[mathew-horner]

@rustbot release-assignment