Use AsRefClosure when generating the bindings

This simplifies things significantly \o/

src/padfoot/protocol.rs

@@ -8,7 +8,8 @@ pub const PROTO_BUS_NAME: &'static str =
     "org.freedesktop.Telepathy.ConnectionManager.padfoot.delta";
 
 pub const PROTO_NAME: &'static str = "delta";
-#[derive(Clone, Copy, Default, Debug)]
+
+#[derive(Debug)]
 pub struct Protocol {}
 
 pub type Variant = arg::Variant<Box<dyn arg::RefArg + 'static>>;
@@ -74,6 +75,10 @@ pub fn requestables() -> Vec<RequestableChannelSpec> {
     vec![(rf, ra)]
 }
 
+impl AsRef<dyn telepathy::Protocol + 'static> for std::rc::Rc<Protocol> {
+    fn as_ref(&self) -> &(dyn telepathy::Protocol + 'static) { &**self }
+}
+
 impl telepathy::Protocol for Protocol {
     fn identify_account(&self, params: HashMap<&str, Variant>) -> Result<String, tree::MethodErr> {
         println!("Protocol::identify_account({:?})", params);