error.txt

error[E0698]: type inside `async` block must be known in this context
 --> src/main.rs:5:1
  |
5 | #[tokio::main]
  | ^^^^^^^^^^^^^^ cannot infer type for type parameter `HandlerE`
  |
note: the type is part of the `async` block because of this `await`
 --> src/main.rs:5:1
  |
5 | #[tokio::main]
  | ^^^^^^^^^^^^^^

error[E0698]: type inside `async` block must be known in this context
 --> src/main.rs:5:1
  |
5 | #[tokio::main]
  | ^^^^^^^^^^^^^^ cannot infer type for type parameter `E`
  |
note: the type is part of the `async` block because of this `await`
 --> src/main.rs:5:1
  |
5 | #[tokio::main]
  | ^^^^^^^^^^^^^^

error: aborting due to 2 previous errors

main.rs

use std::env;
use dotenv::dotenv;
use teloxide::prelude::*;

#[tokio::main]
async fn main() {
    dotenv().ok();
    let token = env::var("BOT_API_TOKEN").unwrap();

    Dispatcher::new(Bot::new(token))
        .message_handler(&|ctx: DispatcherHandlerCtx<Message>| async move {
            ctx.answer("test").send().await?;
            Ok(())
        })
        .dispatch()
        .await;
}