function default arguments depending on other arguments

[Timon Gehr via Digitalmars-d]

On 07/18/2014 12:00 AM, Trass3r wrote:
> void foo(int a, int b = a)
> {
> }
> is illegal in C++ because order of evaluation is undefined.
>
> But since D defines the order to be left to right couldn't it also allow
> this?

It could, and I think it is an unnecessary limitation that it currently 
does not. (This can also be useful if that parameter is the hidden 
'this' reference.)