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+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2016     *)
+(*   \VV/  **************************************************************)
+(*    //   *      This file is distributed under the terms of the       *)
+(*         *       GNU Lesser General Public License Version 2.1        *)
+(************************************************************************)
+
+(** Entry keys for constr notations *)
+
+type 'a entry = 'a Grammar.GMake(CLexer).Entry.e
+
+type side = Left | Right
+
+type gram_assoc = NonA | RightA | LeftA
+
+type gram_position =
+  | First
+  | Last
+  | Before of string
+  | After of string
+  | Level of string
+
+type production_position =
+  | BorderProd of side * gram_assoc option
+  | InternalProd
+
+type production_level =
+  | NextLevel
+  | NumLevel of int
+
+type ('lev,'pos) constr_entry_key_gen =
+  | ETName | ETReference | ETBigint
+  | ETBinder of bool
+  | ETConstr of ('lev * 'pos)
+  | ETPattern
+  | ETOther of string * string
+  | ETConstrList of ('lev * 'pos) * Tok.t list
+  | ETBinderList of bool * Tok.t list
+
+(** Entries level (left-hand-side of grammar rules) *)
+
+type constr_entry_key =
+    (int,unit) constr_entry_key_gen
+
+(** Entries used in productions (in right-hand-side of grammar rules) *)
+
+type constr_prod_entry_key =
+    (production_level,production_position) constr_entry_key_gen
+
+(** Entries used in productions, vernac side (e.g. "x bigint" or "x ident") *)
+
+type simple_constr_prod_entry_key =
+    (production_level,unit) constr_entry_key_gen
+
+(** {5 AST for user-provided entries} *)
+
+type 'a user_symbol =
+| Ulist1 of 'a user_symbol
+| Ulist1sep of 'a user_symbol * string
+| Ulist0 of 'a user_symbol
+| Ulist0sep of 'a user_symbol * string
+| Uopt of 'a user_symbol
+| Uentry of 'a
+| Uentryl of 'a * int
+
+(** {5 Type-safe grammar extension} *)
+
+type ('self, 'a) symbol =
+| Atoken : Tok.t -> ('self, string) symbol
+| Alist1 : ('self, 'a) symbol -> ('self, 'a list) symbol
+| Alist1sep : ('self, 'a) symbol * ('self, _) symbol -> ('self, 'a list) symbol
+| Alist0 : ('self, 'a) symbol -> ('self, 'a list) symbol
+| Alist0sep : ('self, 'a) symbol * ('self, _) symbol -> ('self, 'a list) symbol
+| Aopt : ('self, 'a) symbol -> ('self, 'a option) symbol
+| Aself : ('self, 'self) symbol
+| Anext : ('self, 'self) symbol
+| Aentry : 'a entry -> ('self, 'a) symbol
+| Aentryl : 'a entry * int -> ('self, 'a) symbol
+| Arules : 'a rules list -> ('self, 'a) symbol
+
+and ('self, _, 'r) rule =
+| Stop : ('self, 'r, 'r) rule
+| Next : ('self, 'a, 'r) rule * ('self, 'b) symbol -> ('self, 'b -> 'a, 'r) rule
+
+and ('a, 'r) norec_rule = { norec_rule : 's. ('s, 'a, 'r) rule }
+
+and 'a rules =
+| Rules : ('act, Loc.t -> 'a) norec_rule * 'act -> 'a rules
+
+type 'a production_rule =
+| Rule : ('a, 'act, Loc.t -> 'a) rule * 'act -> 'a production_rule
+
+type 'a single_extend_statment =
+  string option *
+  (** Level *)
+  gram_assoc option *
+  (** Associativity *)
+  'a production_rule list
+  (** Symbol list with the interpretation function *)
+
+type 'a extend_statment =
+  gram_position option *
+  'a single_extend_statment list