Variadic functions: How to pass another variadic function the variadic args?

[Gabi]

On Saturday, 3 August 2013 at 14:58:49 UTC, bearophile wrote:
> Gabi:
>
>>  //HOW TO pass F1(..) the args we were called with ?
>
>
> import std.stdio;
>
> void f1(Args...)(Args args) {
>     foreach (arg; args)
>         arg.writeln;
> }
>
> void f2(Args...)(Args args) {
>     f1(args);
> }
>
> void main() {
>     f2(10, "hello", 1.5);
> }
>
>
> Bye,
> bearophile

Thanks but how do I do this for variadic functions (using 
_arguments and friends) ? Not variadic templates..
More specifically I want to know at runtime the type of each 
parameter