axum/axum-macros/tests/debug_handler/fail/extract_self_mut.rs

use axum::{async_trait, extract::FromRequest, http::Request};
use axum_macros::debug_handler;

struct A;

#[async_trait]
impl<S, B> FromRequest<S, B> for A
where
    B: Send + 'static,
{
    type Rejection = ();

    async fn from_request(_req: Request<B>, _: &S) -> Result<Self, Self::Rejection> {
        unimplemented!()
    }
}

impl A {
    #[debug_handler]
    async fn handler(&mut self) {}
}

fn main() {}