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;;; installed-scm-file
;;;; Copyright (C) 2001 Free Software Foundation, Inc.
;;;;
;;;; This program 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 2, 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 software; see the file COPYING. If not, write to
;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
;;;; Boston, MA 02111-1307 USA
;;;;
;;;; As a special exception, the Free Software Foundation gives permission
;;;; for additional uses of the text contained in its release of GUILE.
;;;;
;;;; The exception is that, if you link the GUILE library with other files
;;;; to produce an executable, this does not by itself cause the
;;;; resulting executable to be covered by the GNU General Public License.
;;;; Your use of that executable is in no way restricted on account of
;;;; linking the GUILE library code into it.
;;;;
;;;; This exception does not however invalidate any other reasons why
;;;; the executable file might be covered by the GNU General Public License.
;;;;
;;;; This exception applies only to the code released by the
;;;; Free Software Foundation under the name GUILE. If you copy
;;;; code from other Free Software Foundation releases into a copy of
;;;; GUILE, as the General Public License permits, the exception does
;;;; not apply to the code that you add in this way. To avoid misleading
;;;; anyone as to the status of such modified files, you must delete
;;;; this exception notice from them.
;;;;
;;;; If you write modifications of your own for GUILE, it is your choice
;;;; whether to permit this exception to apply to your modifications.
;;;; If you do not wish that, delete this exception notice.
;;;;
(define-module (ice-9 stack-catch)
:export (stack-catch))
(define (stack-catch key thunk handler)
"Like @code{catch}, invoke @var{thunk} in the dynamic context of
@var{handler} for exceptions matching @var{key}, but also save the
current stack state in the @var{the-last-stack} fluid, for the purpose
of debugging or re-throwing of an error. If thunk throws to the
symbol @var{key}, then @var{handler} is invoked this way:\n
@example
(handler key args ...)
@end example\n
@var{key} is a symbol or #t.\n
@var{thunk} takes no arguments. If @var{thunk} returns normally, that
is the return value of @code{catch}.\n
Handler is invoked outside the scope of its own @code{catch}. If
@var{handler} again throws to the same key, a new handler from further
up the call chain is invoked.\n
If the key is @code{#t}, then a throw to @emph{any} symbol will match
this call to @code{catch}."
(catch key
(lambda ()
(lazy-catch key
thunk
lazy-handler-dispatch))
handler))
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