[Bug-kawa] [bug #36727] Inconsistency between quasisyntax and #`

[Jamison Hope]

URL:
  <http://savannah.gnu.org/bugs/?36727>

                 Summary: Inconsistency between quasisyntax and #`
                 Project: Kawa
            Submitted by: jhope
            Submitted on: Mon 25 Jun 2012 04:15:45 PM GMT
                Category: Scheme language
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any

    _______________________________________________________

Details:

A while back, using *unquote* inside *quasisyntax* became deprecated:


#|kawa:1|# (quasisyntax ,(cons 1 2))
/dev/stdin:1:15: warning - unquote inside quasisyntax is deprecated - use
unsyntax or #,
(1 . 2)


Following the warning's advice, however, leads to an error:


#|kawa:2|# (quasisyntax #,(cons 1 2))
/dev/stdin:2:26: unknown reader constructor cons


Using literal *unsyntax* instead of *#,* works, though:


#|kawa:3|# (quasisyntax (unsyntax (cons 1 2)))
(1 . 2)


As does using both *#`* and *#,*:


#|kawa:4|# #`#,(cons 1 2)
(1 . 2)


The problem appears to be that ReaderDispatchSyntaxQuote#read sets
reader.inQuasiSyntax = true when it sees *#`*, but nothing sets that flag for
literal *quasisyntax*. So in the latter case, when it gets to *#,* it
erroneously calls ReaderDispatchSyntaxQuote#readNamedConstructor.




    _______________________________________________________

Reply to this item at:

  <http://savannah.gnu.org/bugs/?36727>

_______________________________________________
  Message sent via/by Savannah
  http://savannah.gnu.org/