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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 Glob_term
+
+(** [notation_constr] *)
+
+(** [notation_constr] is the subtype of [glob_constr] allowed in syntactic
+    extensions (i.e. notations).
+    No location since intended to be substituted at any place of a text.
+    Complex expressions such as fixpoints and cofixpoints are excluded,
+    as well as non global expressions such as existential variables. *)
+
+type notation_constr =
+  (** Part common to [glob_constr] and [cases_pattern] *)
+  | NRef of GlobRef.t
+  | NVar of Id.t
+  | NApp of notation_constr * notation_constr list
+  | NHole of Evar_kinds.t * Namegen.intro_pattern_naming_expr * Genarg.glob_generic_argument option
+  | NList of Id.t * Id.t * notation_constr * notation_constr * (* associativity: *) bool
+  (** Part only in [glob_constr] *)
+  | NLambda of Name.t * notation_constr * notation_constr
+  | NProd of Name.t * notation_constr * notation_constr
+  | NBinderList of Id.t * Id.t * notation_constr * notation_constr * (* associativity: *) bool
+  | NLetIn of Name.t * notation_constr * notation_constr option * notation_constr
+  | NCases of Constr.case_style * notation_constr option *
+      (notation_constr * (Name.t * (inductive * Name.t list) option)) list *
+      (cases_pattern list * notation_constr) list
+  | NLetTuple of Name.t list * (Name.t * notation_constr option) *
+      notation_constr * notation_constr
+  | NIf of notation_constr * (Name.t * notation_constr option) *
+      notation_constr * notation_constr
+  | NRec of fix_kind * Id.t array *
+      (Name.t * notation_constr option * notation_constr) list array *
+      notation_constr array * notation_constr array
+  | NSort of glob_sort
+  | NCast of notation_constr * notation_constr cast_type
+
+(** Note concerning NList: first constr is iterator, second is terminator;
+    first id is where each argument of the list has to be substituted
+    in iterator and snd id is alternative name just for printing;
+    boolean is associativity *)
+
+(** Types concerning notations *)
+
+type scope_name = string
+
+type tmp_scope_name = scope_name
+
+type subscopes = tmp_scope_name option * scope_name list
+
+type extended_subscopes = Constrexpr.notation_entry_level * subscopes
+
+(** Type of the meta-variables of an notation_constr: in a recursive pattern x..y,
+    x carries the sequence of objects bound to the list x..y  *)
+
+type constr_as_binder_kind =
+  | AsIdent
+  | AsIdentOrPattern
+  | AsStrictPattern
+
+type notation_binder_source =
+  (* This accepts only pattern *)
+  (* NtnParsedAsPattern true means only strict pattern (no single variable) at printing *)
+  | NtnParsedAsPattern of bool
+  (* This accepts only ident *)
+  | NtnParsedAsIdent
+  (* This accepts ident, or pattern, or both *)
+  | NtnBinderParsedAsConstr of constr_as_binder_kind
+
+type notation_var_instance_type =
+  | NtnTypeConstr | NtnTypeBinder of notation_binder_source | NtnTypeConstrList | NtnTypeBinderList
+
+(** Type of variables when interpreting a constr_expr as a notation_constr:
+    in a recursive pattern x..y, both x and y carry the individual type
+    of each element of the list x..y *)
+type notation_var_internalization_type =
+  | NtnInternTypeAny | NtnInternTypeOnlyBinder
+
+(** This characterizes to what a notation is interpreted to *)
+type interpretation =
+    (Id.t * (extended_subscopes * notation_var_instance_type)) list *
+    notation_constr
+
+type reversibility_status = APrioriReversible | HasLtac | NonInjective of Id.t list
+
+type notation_interp_env = {
+  ninterp_var_type : notation_var_internalization_type Id.Map.t;
+  ninterp_rec_vars : Id.t Id.Map.t;
+}