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[bug #30072] rest pattern after ellipsis

From: Szavai Gyula
Subject: [bug #30072] rest pattern after ellipsis
Date: Mon, 07 Jun 2010 18:43:37 +0000
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20100202 Firefox/3.5.8


                 Summary: rest pattern after ellipsis
                 Project: Guile
            Submitted by: szgyg
            Submitted on: Mon 07 Jun 2010 06:43:36 PM GMT
                Category: None
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any



R6RS-lib 12.4:
"P is of the form (P1 ... Pk Pe <ellipsis> Pm+1 ... Pn . Px), where
<ellipsis> is the identifier ... and F is a list or improper list of n
elements whose first k elements match P1 through Pk, whose next m - k elements
each match Pe, whose next n - m elements match Pm+1 through Pn, and whose nth
and final cdr matches Px."

So, this

(let-syntax ((m (syntax-rules ()
                  ((_ ?x ... . ?y) (list ?x ... ?y)))))
  (write (m '(1 2 3 . 0))))

is legal, but guile produces

ERROR: In procedure macroexpand:
ERROR: syntax-case: misplaced ellipsis in (dummy ?x ... . ?y)


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