Feature request: extending comma operator's functionality

[Adam D. Ruppe]

On Thursday, 4 October 2012 at 22:28:24 UTC, David Nadlinger 
wrote:
> how often have you really encountered big syntactic headaches 
> because of not having something like this available?

I do somewhat regularly. The if(auto x = y()) { use x } is pretty 
convenient but being limited only to the bool check is kinda weak.