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+(************************************************************************)
+(* v * The Coq Proof Assistant / The Coq Development Team *)
+(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2017 *)
+(* \VV/ **************************************************************)
+(* // * This file is distributed under the terms of the *)
+(* * GNU Lesser General Public License Version 2.1 *)
+(************************************************************************)
+
+type t = { (* TODO: inline records in OCaml 4.03 *)
+ system : States.state; (* summary + libstack *)
+ proof : Proof_global.state; (* proof state *)
+ shallow : bool (* is the state trimmed down (libstack) *)
+}
+
+val freeze_interp_state : Summary.marshallable -> t
+val unfreeze_interp_state : t -> unit
+
+(* WARNING: Do not use, it will go away in future releases *)
+val invalidate_cache : unit -> unit