Async .and_then() for your perfectionism!

async_and_then.rs

pub trait AsyncResult<T, E> {
    async fn and_then_async<U, F: AsyncFnOnce(T) -> Result<U, E>>(self, op: F) -> Result<U, E>;
}

impl<T, E> AsyncResult<T, E> for std::result::Result<T, E> {
    #[inline]
    async fn and_then_async<U, F: AsyncFnOnce(T) -> Result<U, E>>(self, op: F) -> Result<U, E> {
        match self {
            Ok(t) => op(t).await,
            Err(e) => Err(e),
        }
    }
}