Type Alias BAM 

pub type BAM<'se, T, R> = Box<dyn Fn(T) -> Box<dyn Future<Output = R> + 'se> + 'se>;

BAM is an abbreviated name of “BoxedAsyncMethod”. It represents an async method that gets one parameter and returns a boxed async future.

Aliased Type

pub struct BAM<'se, T, R>(/* private fields */);