Type Alias BoxedNextFn 

pub type BoxedNextFn = Box<dyn FnOnce(Box<dyn Any + Send>) -> Pin<Box<dyn Future<Output = Result<Box<dyn Any + Send>, Error>> + Send>> + Send>;

Type-erased continuation function for pipeline behaviors.

Carries a boxed request to the next behavior (or terminal handler).

Aliased Type

pub struct BoxedNextFn(/* private fields */);