module Monad:The BatEnum Monadsig
..end
This module provides everything needed for writing and executing
computations in the BatEnum Monad.
type'a
m ='a BatEnum.t
BatEnum.t
.val return : 'a -> 'a m
val bind : 'a m -> ('a -> 'b m) -> 'b m
bind m f
takes the result of the monadic computation m, puts the f function in the monadic context passing it the result of m and then
returning a monadic result.