Compile error when using generic types in dependency injection

[HaoYang670]

Summary

Hi, I meet some compile error when converting my server from concrete tyoe to generic type in dependency injection.
I have a trait defined for interacting with database

#[trait_variant::make(HttpService: Send)]
pub trait DatabaseClient: Clone + Sized + Send + Sync + 'static {
// some async fn defined
}

And I define the client in State as a shared dependency

pub struct AppState<DB: DatabaseClient> {
    db: DB,
}

And I have a handler defined

async fn restart_engine<DB: DatabaseClient>(Path(id): Path<EngineId>, State(state): State<AppState<DB>>) -> Result<()> {...}

I have another function defined to get the router

fn get_engine_router<DB: DatabaseClient>() -> Router<AppState<DB>> {
    Router::new()
        .route("/:id/restart", post(restart_engine::<DB>))
}

but I get compile error:

152 |         .route("/:id/restart", post(restart_engine::<DB>))
    |                                ---- ^^^^^^^^^^^^^^^^^^^^ the trait `Handler<_, _>` is not implemented for fn item `fn(Path<EngineId>, State<AppState<DB>>) -> impl Future<Output = Result<(), RucatError>> {restart_engine::<DB>}`
    |                                |
    |                                required by a bound introduced by this call

I have taken a look at https://github.com/tokio-rs/axum/blob/main/examples/dependency-injection/src/main.rs , but didn't find what may be wrong

axum version

0.7.9

[HaoYang670]

It compiles after I replace #[trait_variant::make(HttpService: Send)] to #[async_trait] , maybe same as #2718

[yanns]

I'm also using #[async_trait] fur such dependency injection.