  Js_of_ocaml library 
  * / 
  * Copyright ( C ) 2015 OCamlPro 
  * 
  * This program is free software ; you can redistribute it and/or modify 
  * it under the terms of the GNU Lesser General Public License as published by 
  * the Free Software Foundation , with linking exception ; 
  * either version 2.1 of the License , or ( at your option ) any later version . 
  * 
  * This program is distributed in the hope that it will be useful , 
  * but WITHOUT ANY WARRANTY ; without even the implied warranty of 
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE .   See the 
  * GNU Lesser General Public License for more details . 
  * 
  * You should have received a copy of the GNU Lesser General Public License 
  * along with this program ; if not , write to the Free Software 
  * Foundation , Inc. , 59 Temple Place - Suite 330 , Boston , MA 02111 - 1307 , USA . 

 * /
 * Copyright (C) 2015 OCamlPro
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, with linking exception;
 * either version 2.1 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*)

* One can add a ppx rewriter to a toplevel by registering it 
     { [ 
       open Migrate_parsetree 

       let init ( ) = 
         let module Converter = 
           Migrate_parsetree . Versions . Convert 
             ( Migrate_parsetree . OCaml_405 ) 
             ( Migrate_parsetree .  ) 
         in 
         let mapper = Converter.copy_mapper Ppx_js.mapper in 
         Compiler_libs.Ast_mapper.register " js_of_ocaml " ( fun _ - > mapper ) 
     ] } 

    {[
      open Migrate_parsetree

      let init () =
        let module Converter =
          Migrate_parsetree.Versions.Convert
            (Migrate_parsetree.OCaml_405)
            (Migrate_parsetree.OCaml_current)
        in
        let mapper = Converter.copy_mapper Ppx_js.mapper in
        Compiler_libs.Ast_mapper.register "js_of_ocaml" (fun _ -> mapper)
    ]}
*)

* Helpers to embed PPX into the toplevel .

val preprocess_structure: Parsetree.structure       -> Parsetree.structure
val preprocess_signature: Parsetree.signature       -> Parsetree.signature
val preprocess_phrase   : Parsetree.toplevel_phrase -> Parsetree.toplevel_phrase

  Js_of_ocaml library 
  * / 
  * Copyright ( C ) 2015 OCamlPro 
  * 
  * This program is free software ; you can redistribute it and/or modify 
  * it under the terms of the GNU Lesser General Public License as published by 
  * the Free Software Foundation , with linking exception ; 
  * either version 2.1 of the License , or ( at your option ) any later version . 
  * 
  * This program is distributed in the hope that it will be useful , 
  * but WITHOUT ANY WARRANTY ; without even the implied warranty of 
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE .   See the 
  * GNU Lesser General Public License for more details . 
  * 
  * You should have received a copy of the GNU Lesser General Public License 
  * along with this program ; if not , write to the Free Software 
  * Foundation , Inc. , 59 Temple Place - Suite 330 , Boston , MA 02111 - 1307 , USA . 

 * /
 * Copyright (C) 2015 OCamlPro
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, with linking exception;
 * either version 2.1 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*)

* One can add a ppx rewriter to a toplevel by registering it 
     { [ 
       open Migrate_parsetree 

       let init ( ) = 
         let module Converter = 
           Migrate_parsetree . Versions . Convert 
             ( Migrate_parsetree . OCaml_405 ) 
             ( Migrate_parsetree .  ) 
         in 
         let mapper = Converter.copy_mapper Ppx_js.mapper in 
         Compiler_libs.Ast_mapper.register " js_of_ocaml " ( fun _ - > mapper ) 
     ] } 

    {[
      open Migrate_parsetree

      let init () =
        let module Converter =
          Migrate_parsetree.Versions.Convert
            (Migrate_parsetree.OCaml_405)
            (Migrate_parsetree.OCaml_current)
        in
        let mapper = Converter.copy_mapper Ppx_js.mapper in
        Compiler_libs.Ast_mapper.register "js_of_ocaml" (fun _ -> mapper)
    ]}
*)

* Helpers to embed PPX into the toplevel .

val preprocess_structure: Parsetree.structure       -> Parsetree.structure
val preprocess_signature: Parsetree.signature       -> Parsetree.signature
val preprocess_phrase   : Parsetree.toplevel_phrase -> Parsetree.toplevel_phrase
