module CCPersistentHashtbl:sig..end
Almost as efficient as the regular Hashtbl type, but with a persistent interface (rewinding changes to get back in the past history). This is mostly useful for backtracking-like uses, or forward uses (never using old values).
    This module is not thread-safe.
type'asequence =('a -> unit) -> unit
type'aprinter =Format.formatter -> 'a -> unit
type'aequal ='a -> 'a -> bool
module type HashedType =sig..end
module type S =sig..end
module Make(H:HashedType):Swith type key = H.t