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+(************************************************************************)
+(*         *   The Coq Proof Assistant / The Coq Development Team       *)
+(*  v      *   INRIA, CNRS and contributors - Copyright 1999-2018       *)
+(* <O___,, *       (see CREDITS file for the list of authors)           *)
+(*   \VV/  **************************************************************)
+(*    //   *    This file is distributed under the terms of the         *)
+(*         *     GNU Lesser General Public License Version 2.1          *)
+(*         *     (see LICENSE file for the text of the license)         *)
+(************************************************************************)
+
+open Names
+
+(** {5 Patterns} *)
+
+(** Cases pattern variables *)
+type patvar = Id.t
+
+type case_info_pattern =
+    { cip_style : Constr.case_style;
+      cip_ind : inductive option;
+      cip_ind_tags : bool list option; (** indicates LetIn/Lambda in arity *)
+      cip_extensible : bool (** does this match end with _ => _ ? *) }
+
+type constr_pattern =
+  | PRef of GlobRef.t
+  | PVar of Id.t
+  | PEvar of Evar.t * constr_pattern array
+  | PRel of int
+  | PApp of constr_pattern * constr_pattern array
+  | PSoApp of patvar * constr_pattern list
+  | PProj of Projection.t * constr_pattern
+  | PLambda of Name.t * constr_pattern * constr_pattern
+  | PProd of Name.t * constr_pattern * constr_pattern
+  | PLetIn of Name.t * constr_pattern * constr_pattern option * constr_pattern
+  | PSort of Glob_term.glob_sort
+  | PMeta of patvar option
+  | PIf of constr_pattern * constr_pattern * constr_pattern
+  | PCase of case_info_pattern * constr_pattern * constr_pattern *
+      (int * bool list * constr_pattern) list (** index of constructor, nb of args *)
+  | PFix of (int array * int) * (Name.t array * constr_pattern array * constr_pattern array)
+  | PCoFix of int * (Name.t array * constr_pattern array * constr_pattern array)
+
+(** Nota : in a [PCase], the array of branches might be shorter than
+    expected, denoting the use of a final "_ => _" branch *)