Type Alias BoxPromise 

pub type BoxPromise<'a, T> = Pin<Box<dyn Future<Output = T> + Send + 'a>>;

An owned dynamically typed Future for use in cases where you can’t statically type your result or need to add some indirection.

This type is often created by the boxed method on FutureExt. See its documentation for more.

Aliased Type

pub struct BoxPromise<'a, T> { /* private fields */ }