Permitted locations of a version condition

[Phil Deets]

On Thu, 29 Oct 2009 22:16:13 -0500, Stewart Gordon <smjg_1998 at yahoo.com>  
wrote:

> Phil Deets wrote:
>> I would definitely like the following code to work.
>>  enum Tag
>> {
>>    A, B, C,
>>    version (5) {
>>       D, E,
>>    }
>>    version (7) {
>>       F, G,
>>    }
>>    // ...
>> }
>
> So would I, except that it makes more sense to me to have the trailing  
> comma after the '}'.  Commas separate, unlike semicolons, which  
> terminate.
>

I put the comma inside the version block because then there wouldn't be  
duplicate commas if the version was removed. If the version number was 6  
in the above example, it would evaluate to "A, B, C, D, E," with my way,  
but

enum Tag
{
    A, B, C,
    version (5) {
       D, E
    },
    version (7) {
       F, G
    },
    // ...
}

would evaluate to "A, B, C, D, E, ," which has two commas in a row.  
However, you could keep version blocks separated with commas if you  
specialized the enum grammar specifically for version blocks, which might  
be the right way to go.