Is there a way to get the types of all template parameters?

[Atila Neves via Digitalmars-d-learn]

For regular runtime parameters, there's ParameterTypeTuple. How 
would I write an equivalent template for template parameters? i.e.

     void fun(Foo foo, Bar bar)() {}

     alias types = CtParameterTypeTuple!fun; //TypeTuple!(Foo, Bar)

I've tried but my is expression kung fu was weak.

Atila