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Fix handling of quote inside unquote-splicing in quasipattern.

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svn: r8959
This commit is contained in:
Sam Tobin-Hochstadt 2008-03-12 14:05:02 +00:00
parent bba17def0f
commit 6326734300
1 changed files with 8 additions and 5 deletions
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13
collects/mzlib/private/match/parse-quasi.scm
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@ -64,12 +64,15 @@
(let ([first-car
(syntax-case (car l)
(unquote-splicing quasiquote)
[,@`p ;; have to parse forward here
(let ((pq (parse-q (syntax p))))
(if (stx-list? pq)
(cdr (syntax->list pq))
[,@(q p) ;; have to parse forward here
(or (module-identifier=? #'quasiquote #'q)
(module-identifier=? #'quote #'q))
(let ((pq (parse-q (syntax p))))
(if (stx-list? pq)
(cdr (syntax->list pq))
(begin
(q-error (syntax ,@`p)
"unquote-splicing not followed by list")))]
"unquote-splicing not followed by list"))))]
[,@p
(if (and (stx-list? (syntax p))
(memq (syntax-e (car (syntax->list #'p))) '(list list-rest)))