module Core_map_intf:Test whether a map is empty or not.sig
..end
module List: List
module type Key = Comparator.Pre
module type Key_binable = Comparator.Pre_binable
module type Accessors =sig
..end
type('a, 'comparator, 'z)
create_options_without_comparator ='z
type('a, 'comparator, 'z)
create_options_with_comparator =comparator:('a, 'comparator) Comparator.t -> 'z
module type Creators =sig
..end
module type S =sig
..end
module type S_binable =sig
..end