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+(************************************************************************)
+(* v * The Coq Proof Assistant / The Coq Development Team *)
+(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2010 *)
+(* \VV/ **************************************************************)
+(* // * This file is distributed under the terms of the *)
+(* * GNU Lesser General Public License Version 2.1 *)
+(************************************************************************)
+
+(** Adding a bit of camlp5 syntax to camlp4 for compatibility:
+ - GEXTEND ... becomes EXTEND ...
+*)
+
+open Camlp4.PreCast
+
+let rec my_token_filter = parser
+ | [< '(KEYWORD "GEXTEND", loc); s >] ->
+ [< '(KEYWORD "EXTEND", loc); my_token_filter s >]
+ | [< 'tokloc; s >] -> [< 'tokloc; my_token_filter s >]
+ | [< >] -> [< >]
+
+let _ =
+ Token.Filter.define_filter (Gram.get_filter())
+ (fun prev strm -> prev (my_token_filter strm))