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diff --git a/intf/extend.mli b/intf/extend.mli
deleted file mode 100644
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--- a/intf/extend.mli
+++ /dev/null
@@ -1,104 +0,0 @@
-(************************************************************************)
-(*  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 Compat.GrammarMake(CLexer).entry
-
-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