RE: [sv-ec] {}

Is it agreed that empty unpacked array concatenations were to be allowed? 

Shalom

> -----Original Message-----
> From: jonathan.bromley@doulos.com 
> [mailto:jonathan.bromley@doulos.com] 
> Sent: Tuesday, July 28, 2009 1:05 AM
> To: Bresticker, Shalom; sv-ec@server.eda.org
> Subject: Re: [sv-ec] {}
> 
> Shalom,
> 
> > There seems to be an ambiguity in the LRM on the use of {} to denote
> > an empty array.
> > 
> > On the one hand, the LRM seems to restrict it to queues. 
> > The BNF non-terminal "primary" contains "empty_queue", 
> defined as "{ }", 
> 
> > and footnote 31 says that "{ } shall only be legal in the 
> context ofa 
> queue".
> > 
> > On the other hand, 10.10 says,
> [...]
> 
> Mea culpa.  This is clearly an oversight in Mantis 1702.
> I recall that I looked at the BNF and decided that no change
> was needed because the existing production "concatenation"
> does all that's required for unpacked array concatenation,
> except that it does not admit the empty form {}, for which
> the existing production "empty_queue" suffices.  But I missed
> the footnote which, as you say, introduces doubt in the
> reader's mind - especially when taken with the name
> of the production "empty_queue".
> 
> It would probably be best to rename "empty_queue" to 
> "empty_concatenation" and reword the offending footnote.
> I'll raise a new Mantis for this.
> 
> Thanks
> -- 
> Jonathan Bromley
> Consultant
> 
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