[r6rs-discuss] [Formal] Quasiquote should support unquotation within bytes objects.

From: David Van Horn <dvanhorn>
Date: Thu Nov 16 00:43:32 2006

John Cowan wrote:
> Abdulaziz Ghuloum scripsit:
>
>> The problem with the above is that (unquote a), (unquote b) and
>> (unquote-splicing cs) are not unsigned-8 values; you just cannot put
>> them in a vu8. Supporting your proposal severely complicates the
>> reader and the expander since you have to perform macro expansion while
>> reading; this may not even be possible.
>
> This is where SRFI-10 comes in handy.

As far as I can tell, SRFI-10 does not help in this case.

To simplify Felix Klock's original example:

(let ((a 0) (b 1))
   `#vu8(,a ,b))
==> #vu8(0 1)

This would become, using SRFI-10:

(let ((a 0) (b 1))
   #,(vu8 a b))

But here, the reader associated with vu8 would be applied to the symbol
'a and 'b, not 0 and 1.

David
Received on Thu Nov 16 2006 - 00:43:22 UTC