Variadic template arguments unpacking

[Max Strakhov]

Thanx for all your help, i just solved the problem with mixins 
like this:

string res = "";
for(i, rev v; args)
     res ~= string.format(", f(args[%d]).val()");
mixin("return G(" ~ res ~ ");");

Only without any actual looping and variables, so compiler could 
deal with it.