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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
+open Globnames
+open Misctypes
+
+(** The kinds of existential variable *)
+
+(** Should the obligation be defined (opaque or transparent (default)) or
+ defined transparent and expanded in the term? *)
+
+type obligation_definition_status = Define of bool | Expand
+
+type matching_var_kind = FirstOrderPatVar of patvar | SecondOrderPatVar of patvar
+
+type t =
+ | ImplicitArg of global_reference * (int * Id.t option)
+ * bool (** Force inference *)
+ | BinderType of Name.t
+ | NamedHole of Id.t (* coming from some ?[id] syntax *)
+ | QuestionMark of obligation_definition_status * Name.t
+ | CasesType of bool (* true = a subterm of the type *)
+ | InternalHole
+ | TomatchTypeParameter of inductive * int
+ | GoalEvar
+ | ImpossibleCase
+ | MatchingVar of matching_var_kind
+ | VarInstance of Id.t
+ | SubEvar of Evar.t