+type tactic = status -> proof * goal list
+
+ (** creates an opaque tactic from a status->proof*goal list function *)
+let mk_tactic t = t
+
+ (** what, hypothesis patterns, conclusion pattern *)
+type pattern = Cic.term option * (string * Cic.term) list * Cic.term
+let conclusion_pattern t = t,[],Cic.Implicit (Some `Hole)