Functor Container.Check

module Check: 
functor (T : sig
type 'a elt 

type 'a container 

end) -> 
functor (M : sig
val length : 'a T.container -> int
val is_empty : 'a T.container -> bool
val iter : 'a T.container -> f:('a T.elt -> unit) -> unit
val fold : 'a T.container -> init:'b -> f:('b -> 'a T.elt -> 'b) -> 'b
val exists : 'a T.container -> f:('a T.elt -> bool) -> bool
val for_all : 'a T.container -> f:('a T.elt -> bool) -> bool
val find : 'a T.container -> f:('a T.elt -> bool) -> 'a T.elt option
val to_list : 'a T.container -> 'a T.elt list
val to_array : 'a T.container -> 'a T.elt array
end) -> sig .. end