How to build path of two idents?

[obsoleszenz]

I want to create a Foo::Bartoken stream and am currently trying it like this:

let foo = format_ident!("Foo");
let bar = format_ident!("Bar");
quote! {
  #foo::#bar
}

but this results in a token stream of `Foo :: Bar` which the compiler doesn't accept. 

[Odilf]

You can do it with format_ident