Feature request: extending comma operator's functionality

[Tommi]

On Thursday, 4 October 2012 at 22:28:24 UTC, David Nadlinger 
wrote:
>
> Yes, a language designed could make that choice. But not, it 
> certainly won't be considered for D unless it can be shown that 
> the change solves a real problem with the current syntax.

But I'm not suggesting any kind of change in syntax. This syntax 
in D currently works (as long as expr2 is convertible to bool):

if (Type var = expr1, expr2)
{
     //...
}

What I'm suggesting is, I think, quite reasonable: make it so 
that 'var' is visible to 'expr2'.