[clisp-list] Re: reader: small inconsistency with commas.

[Pascal J.B. <pj...@in...>]

Sam Steingold writes:
> > * Pascal J.Bourguignon <cwo@vasbezngvzntb.pbz> [2004-07-27 09:09:54 +0200]:
> >
> >     [9]> 1,
> >     1
> >
> > Oops! No error detected here...
> >
> >     [11]> 1 ,
> >     1
> >     [12]> 
> >     *** - READ: comma is illegal outside of backquote
> >     Break 1 [13]> 
> 
> this boils down to the fact that in CLISP
> 
> (let ((cs (make-concatenated-stream (make-string-input-stream "a"))))
>   (unread-char (read-char cs) cs)
>   (eql (peek-char nil cs)
>        (peek-char nil (first (concatenated-stream-streams cs)) nil nil)))
> 
> returns NIL (while in CMUCL and LWW it return T, even though I see no
> indication in ANSI that this is required).

But I did not get the impression that the reader algorithm described in 
www.lispworks.com/reference/HyperSpec/Body/02_b.htm
makes any references to peek-char and unread-char...

In any case, this is a low priority item.


-- 
__Pascal Bourguignon__                     http://www.informatimago.com/

There is no worse tyranny than to force a man to pay for what he does not
want merely because you think it would be good for him. -- Robert Heinlein