module version query syntax

[Alex Buckley]

Mark Reinhold wrote:
>> Date: Mon, 02 Mar 2009 11:46:51 -0800
>> From: jonathan.gibbons at sun.com
> 
>> The syntax for module version queries includes support for ranges
>> introduced by '(' and '[', but doesn't allow ',', so you can't write
>>     requires M@[1,2)
>> without quoting the stuff after the @.
>>
>> Is this intentional?
> 
> No, I doubt it.  Looks like a bug.

If comma is allowed in the token after the @, then comma cannot also be 
used to separate module identities. In that case, a 'requires' clause 
could only take one module identity, a la 'import'. This may be a good 
thing.

Semicolon is harder, since its role as end-of-statement is so well 
known. Dropping that to allow semicolons in version ranges, e.g. 1-3;5 
to exclude v4, looks undesirable to me.

I have not received any EG feedback in this area, and will bring up the 
dual meaning of comma+semicolon soon.

Alex