Type Alias BoxFuture 

pub type BoxFuture<'a, Res, Err> = Pin<Box<dyn Future<Output = Result<Res, Err>> + 'a>>;

boxed core::future::Future trait object with no extra auto trait bound(!Send and !Sync).

Aliased Type

pub struct BoxFuture<'a, Res, Err> { /* private fields */ }