simplify plugin code

src/client.rs

@@ -103,7 +103,7 @@ impl ClientBuilder {
 pub struct Client {
     jid: Jid,
     transport: Arc<Mutex<SslTransport>>,
-    plugins: HashMap<TypeId, Arc<Box<Plugin>>>,
+    plugins: HashMap<TypeId, Arc<Plugin>>,
     binding: PluginProxyBinding,
     dispatcher: Arc<Dispatcher>,
 }
@@ -118,7 +118,7 @@ impl Client {
     pub fn register_plugin<P: Plugin + PluginInit + 'static>(&mut self, mut plugin: P) {
         let binding = self.binding.clone();
         plugin.bind(binding);
-        let p = Arc::new(Box::new(plugin) as Box<Plugin>);
+        let p = Arc::new(plugin) as Arc<Plugin>;
         P::init(&self.dispatcher, p.clone());
         if self.plugins.insert(TypeId::of::<P>(), p).is_some() {
             panic!("registering a plugin that's already registered");

src/component.rs

@@ -84,7 +84,7 @@ impl ComponentBuilder {
 pub struct Component {
     jid: Jid,
     transport: Arc<Mutex<PlainTransport>>,
-    plugins: HashMap<TypeId, Arc<Box<Plugin>>>,
+    plugins: HashMap<TypeId, Arc<Plugin>>,
     binding: PluginProxyBinding,
     dispatcher: Arc<Dispatcher>,
 }
@@ -99,7 +99,7 @@ impl Component {
     pub fn register_plugin<P: Plugin + PluginInit + 'static>(&mut self, mut plugin: P) {
         let binding = self.binding.clone();
         plugin.bind(binding);
-        let p = Arc::new(Box::new(plugin) as Box<Plugin>);
+        let p = Arc::new(plugin) as Arc<Plugin>;
         P::init(&self.dispatcher, p.clone());
         if self.plugins.insert(TypeId::of::<P>(), p).is_some() {
             panic!("registering a plugin that's already registered");

src/plugin.rs

@@ -90,7 +90,7 @@ pub trait Plugin: Any + PluginAny {
 }
 
 pub trait PluginInit {
-    fn init(dispatcher: &Dispatcher, me: Arc<Box<Plugin>>);
+    fn init(dispatcher: &Dispatcher, me: Arc<Plugin>);
 }
 
 pub trait PluginAny {

src/plugin_macro.rs

@@ -10,7 +10,7 @@ macro_rules! impl_plugin {
         #[allow(unused_variables)]
         impl $crate::plugin::PluginInit for $plugin {
             fn init( dispatcher: &$crate::event::Dispatcher
-                   , me: ::std::sync::Arc<Box<$crate::plugin::Plugin>>) {
+                   , me: ::std::sync::Arc<$crate::plugin::Plugin>) {
                 $(
                     let new_arc = me.clone();
                     dispatcher.register($pri, move |e: &$evt| {