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stack-catch.scm
;;; installed-scm-file ;;;; Copyright (C) 2001, 2006, 2010 Free Software Foundation, Inc. ;;;; ;;;; This library 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; either ;;;; version 3 of the License, or (at your option) any later version. ;;;; ;;;; This library 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 library; if not, write to the Free Software ;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA ;;;; (define-module (ice-9 stack-catch) #:use-module (ice-9 save-stack) #: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 thunk handler (lambda (key . args) ;; Narrow by two more frames: this one, and the throw handler. (save-stack 2) (apply throw key args))))
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