Typesafe variadics in any position

[Andrej Mitrovic]

On Tuesday, 26 February 2013 at 20:29:51 UTC, Steven 
Schveighoffer wrote:
> Would it be something people want?

Yes. Also related: 
http://d.puremagic.com/issues/show_bug.cgi?id=8687

One extremely common and important use-case of allowing it is 
this:

foo(string[] args..., string file = __FILE__, size_t line = 
__LINE__);

Right now as soon as you introduce variadics you can forget about 
using __FILE__/__LINE__ at runtime (unless you resort to some 
inner-template tricks, but that only works in some cases 
methinks, probably not at runtime).