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use futures::Future;

pub trait Future2 {
    type Item;
    type Error;
}

/// A type alias for Box<Item = T, Error = E>
pub type BoxFuture<T, E> = Box<Future<Item = T, Error = E>>;

pub trait FutureExt: Future {
    fn into_box(self) -> BoxFuture<Self::Item, Self::Error>
    where
        Self: Sized + 'static,
    {
        Box::new(self)
    }
}

impl<F: Future> FutureExt for F {}