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use crate::runtime;
use crate::task::JoinHandle;

use std::future::Future;

/// Spawns a new asynchronous task, returning a
/// [`JoinHandle`](super::JoinHandle)] for it.
///
/// Spawning a task enables the task to execute concurrently to other tasks. The
/// spawned task may execute on the current thread, or it may be sent to a
/// different thread to be executed. The specifics depend on the current
/// [`Runtime`](crate::runtime::Runtime) configuration.
///
/// # Examples
///
/// In this example, a server is started and `spawn` is used to start a new task
/// that processes each received connection.
///
/// ```no_run
/// use tokio::net::{TcpListener, TcpStream};
///
/// use std::io;
///
/// async fn process(socket: TcpStream) {
///     // ...
/// # drop(socket);
/// }
///
/// #[tokio::main]
/// async fn main() -> io::Result<()> {
///     let mut listener = TcpListener::bind("127.0.0.1:8080").await?;
///
///     loop {
///         let (socket, _) = listener.accept().await?;
///
///         tokio::spawn(async move {
///             // Process each socket concurrently.
///             process(socket).await
///         });
///     }
/// }
/// ```
///
/// # Panics
///
/// Panics if called from **outside** of the Tokio runtime.
pub fn spawn<T>(task: T) -> JoinHandle<T::Output>
where
    T: Future + Send + 'static,
    T::Output: Send + 'static,
{
    runtime::spawn(task)
}