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#[derive(Serialize)]
struct User {
    username: String,
}

#[debug_handler]
pub async fn get_user(Path(user_id) : Path<u32>) -> Xml<User> {
    let user = User {username: "test".to_string()};
    Xml(user)
}

error[E0277]: the trait bound `Xml<User>: IntoResponse` is not satisfied
  --> src\wecom\handler\message.rs:73:53
   |
73 | pub async fn get_user(Path(user_id) : Path<u32>) -> Xml<User> {
   |                                                     ^^^ the trait `IntoResponse` is not implemented for `Xml<User>`
   |
   = help: the following other types implement trait `IntoResponse`:
             &'static [u8]
             &'static str
             ()
             (Response<()>, R)
             (Response<()>, T1, R)
             (Response<()>, T1, T2, R)
             (Response<()>, T1, T2, T3, R)
   |                   ^^^ required by this bound in `__axum_macros_check_reply_handler_1_from_request_check`

For more information about this error, try `rustc --explain E0277`.