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(while): Remove the unquote from do, it breaks with ice-9

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syncase.  Reported by Pach Roman.
This commit is contained in:
Kevin Ryde 2005-01-27 21:20:47 +00:00
parent 76da80e788
commit c8fc38b13b
1 changed files with 12 additions and 2 deletions
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14
ice-9/boot-9.scm
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@ -1,6 +1,6 @@
;;; installed-scm-file
;;;; Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003,2004
;;;; Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005
;;;; Free Software Foundation, Inc.
;;;;
;;;; This library is free software; you can redistribute it and/or
@ -2754,6 +2754,16 @@
;; `while' even when recursing. `while-helper' is an easy way to keep the
;; `key' binding away from the cond and body code.
;;
;; FIXME: This is supposed to have an `unquote' on the `do' the same used
;; for lambda and not, so as to protect against any user rebinding of that
;; symbol, but unfortunately an unquote breaks with ice-9 syncase, eg.
;;
;; (use-modules (ice-9 syncase))
;; (while #f)
;; => ERROR: invalid syntax ()
;;
;; This is probably a bug in syncase.
;;
(define-macro (while cond . body)
(define (while-helper proc)
(do ((key (make-symbol "while-key")))
@ -2763,7 +2773,7 @@
(lambda () (throw key #f))))
(lambda (key arg) arg)))))
`(,while-helper (,lambda (break continue)
(,do ()
(do ()
((,not ,cond))
,@body)
#t)))