You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: custom_extractor.rs
    path of file: ./repos/axum/examples/customize-extractor-error/src
    
    the code of the file until where you have to start completion: //! Manual implementation of `FromRequest` that wraps another extractor
//!
//! + Powerful API: Implementing `FromRequest` grants access to `RequestParts`
//!   and `async/await`. This means that you can create more powerful rejections
//! - Boilerplate: Requires creating a new extractor for every custom rejection
//! - Complexity: Manually implementing `FromRequest` results on more complex code
use axum::{
    async_trait,
    extract::{rejection::JsonRejection, FromRequest, MatchedPath, Request},
    http::StatusCode,
    response::IntoResponse,
    RequestPartsExt,
};
use serde_json::{json, Value};

pub async fn handler(Json(value): Json<Value>) -> impl IntoResponse {
    Json(dbg!(value));
}

// We define our own `Json` extractor that customizes the error from `axum::Json`
pub struct Json<T>(p
    
    async fn from_request(req: Request, state: &S) -> Result<Self, Self::Rejection> {
        let (mut parts, body) = req.into_parts();

        // We can use other extractors to provide better rejection messages.
        // For example, here we are using `axum::extract::MatchedPath` to
        // provide a better error message.
        //
        // Have to run that first since `Json` extraction consumes the request.
        let path = parts
            .extract::<MatchedPath>()
            .await
            .map(|path| path.as_str().to_owned())
            .ok();

        let req = Request::from_parts(parts, body);

        match axum::Json::<T>::from_request(req, state).await {
            Ok(value) => Ok(Self(value.0)),
            // convert the error from `axum::Json` into whatever we want
            Err(rejection) => {
                let payload = json!({
                    "message": rejection.body_text(),
                    "origin": "custom_extractor",
                    "path": path,
                });

                Err((rejection.status(), axum::Json(payload)))
            }
        }
    }