ToDo-native

end of acondbranch needs checking (double INST_TAIL? No LABEL2 before NEXT_P2?)
TRY does not produce a correct recovery address for THROW.
lib.fs does some funny things to the return address (certainly does
  not work with gforth-native).
The >EXEC trick (users: >STDERR) might work, but I am not sure.

-----
Copyright (C) 1995,1996,1997,1998,2000,2003,2007 Free Software Foundation, Inc.

This file is part of Gforth.

Gforth is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation, either version 3
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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see http://www.gnu.org/licenses/.