Should we deprecate comma?

[Dicebot]

On Monday, 24 March 2014 at 17:35:46 UTC, bearophile wrote:
> Dicebot:
>
>> 	int a, b, c;
>> 	
>> 	tuple(a, b, c) = foo();
>> 	writeln(a, b, c); // 000
>> 	
>> 	TypeTuple!(a, b, c) = foo();
>> 	writeln(a, b, c); // 123
>> }
>
> One of the points of a good tuple syntax is to not need to 
> define the variables before (because in several cases you can't 
> do that).

I understand but this is something that can be pretty hard to fit 
into D semantics/grammar and I am not sold that it is worth the 
push on its own.

>> On Monday, 24 March 2014 at 16:59:37 UTC, bearophile wrote:
>>> void foo(in auto tuple(a, b, c)) {}
>>
>> This snippet does not make any sense.
>
> It's equivalent to Python2.6 code:
>
> def foo((a, b, c)):
>
>
> A more complete Python2.6 program:
>
> def foo((a, b, c)):
>     print a, "-", b, "-", c
>
> t = (10, 20, 30)
> foo(t)
>
> Output:
>
> 10 - 20 - 30

What is the difference with this then?

void foo(int a, int b, int c)
{
     // ...
}

auto t = tuple(10, 20, 30);
foo(t.expand);