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This crate provides async-std-based runtime and acceptor for roa.

```rust,no_run
use roa::http::StatusCode;
use roa::{App, Context};
use roa_async_std::{Listener, Exec};
use std::error::Error;

async fn end(_ctx: &mut Context) -> roa::Result {
    Ok(())
}

#[async_std::main]
async fn main() -> Result<(), Box<dyn Error>> {
    let (addr, server) = App::with_exec((), Exec).end(end).run()?;
    println!("server is listening on {}", addr);
    server.await?;
    Ok(())
}
```