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; Milawa - A Reflective Theorem Prover
; Copyright (C) 2005-2009 Kookamara LLC
;
; Contact:
;
; Kookamara LLC
; 11410 Windermere Meadows
; Austin, TX 78759, USA
; http://www.kookamara.com/
;
; License: (An MIT/X11-style license)
;
; Permission is hereby granted, free of charge, to any person obtaining a
; copy of this software and associated documentation files (the "Software"),
; to deal in the Software without restriction, including without limitation
; the rights to use, copy, modify, merge, publish, distribute, sublicense,
; and/or sell copies of the Software, and to permit persons to whom the
; Software is furnished to do so, subject to the following conditions:
;
; The above copyright notice and this permission notice shall be included in
; all copies or substantial portions of the Software.
;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
; DEALINGS IN THE SOFTWARE.
;
; Original author: Jared Davis <jared@kookamara.com>
(in-package "ACL2")
;; I like to write (force (and hyp1 ... hypN)). I have found that most of the
;; time, this works just fine and has the same behavior as (and (force HYP1)
;; ... (force HYPN)). However, I have also discovered a case where it does not
;; behave the same, and it caused a proof to fail. So I redefine force as a
;; macro which expands (force (and hyp1 ... hypn)) into (and (force hyp1)
;; ... (force hypn)).
(defun aux-force-fn (hyps)
(declare (xargs :mode :program))
(if (consp hyps)
(cons `(MILAWA::force ,(car hyps))
(aux-force-fn (cdr hyps)))
nil))
(defun jareds-force-fn (hyp)
;; Produce the expansion for (force hyp)
(declare (xargs :mode :program))
(cond ((and (consp hyp)
(equal (car hyp) 'AND))
`(AND ,@(aux-force-fn (cdr hyp))))
((and (consp hyp)
(equal (car hyp) 'MILAWA::force))
hyp)
(t
`(ACL2::force ,hyp))))
(defmacro MILAWA::force (hyp)
(jareds-force-fn hyp))
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