Support patterns in quote! iterators

[ModProg]

Not sure if I'm using the right word.

In rust's quote you can do

quote!(#(#the-iterator ;)*)

while in rune it would have to be

quote!(#(quote!(#the-iterator ;))*)

while being able to use #() for expressions is powerful, it would be nice if there could be a way to support the rust style quote as well. maybe one could use () for one thing and {} for the other? not sure.