Incorrect Codelens Function Reference Count

Summary

Codelens reference count for a function is incorrect when #[post("/hello")] attribute is used. Clicking on the codelens reference count link (opening the expanded view) shows a smaller number of references and yet still incorrect. Removing the post attribute shows the correct reference count.

Information

OS / VSCode: win11/vscode1.79.1(user setup)
rust-analyzer version: 0.3.1549-standalone (d567091f4 2023-06-11)
rustc: 1.70.0 (90c541806 2023-05-31)

Link to the repository that reproduces this issue: https://github.com/jpnws/example

Before proceeding, enable Rust-analyzer > Lens > References > Method.

In the end, you will see the following Rust workspace folder structure.

Dependencies: just actix-web and tokio.

Steps to reproduce

1. Create a folder called example and create example/Cargo.toml file.
2. In example/Cargo.toml, write:

[workspace]
members = ["main", "lib"]

3. Create example/main/Cargo.toml and example/main/src/main.rs.
4. In example/main/Cargo.toml, write:

[package]
name = "main"
version = "0.1.0"
edition = "2021"

[dependencies]
actix-web = "4"
tokio = { version = "1", features = ["macros", "rt-multi-thread"] }
lib = { path = "../lib" }

5. In example/main/src/main.rs, write:

use actix_web::{web, App, HttpResponse, HttpServer};

#[tokio::main]
async fn main() -> std::io::Result<()> {
    HttpServer::new(|| {
        App::new()
            .route("/", web::get().to(HttpResponse::Ok))
            .service(lib::hello)
    })
    .bind(("127.0.0.1", 8080))?
    .run()
    .await
}

6. Create example/lib/Cargo.toml and example/lib/src/lib.rs.
7. In example/lib/Cargo.toml, write:

[package]
name = "lib"
version = "0.1.0"
edition = "2021"

[dependencies]
actix-web = "4"

8. In example/lib/src/lib.rs, write:

use actix_web::{post, HttpRequest};

#[post("/hello")]
pub async fn hello(_req: HttpRequest) -> String {
    "Hello".to_owned()
}

9. In example folder, run cargo build.
10. Open example/lib/src/lib.rs and observe the codelens reference count above the hello function.

Expected

The number of references to the lib::hello function should be 1.

Actual

The numer of references to the lib::hello function is 6.

Thoughts

• Clicking on the codelens "6 references" link shows 2 references in the expanded view, one in example/main/src/main.rs and one to the function definition itself. It is odd to see that the expanded view shows 2 references when it claimed the function has 6. Also, including the function itself as a reference seems odd.

• After removing #[post("/hello")] attribute, the codelens shows 1 reference. Clicking it shows the correct reference: lib::hello in example/main/src/main.rs.

Reproduce the workspace from main/src/main.rs, lib/src/lib.rs, and the two Cargo.toml files, then run cargo build and inspect the references codelens on lib::hello with and without #[post("/hello")]. Done means the attributed function reports one reference and the expanded view lists only its use in main/src/main.rs, without counting the definition.