Remove the MessagePayload trait, it was a bad idea.

src/body.rs

@@ -1,7 +1,6 @@
 use minidom::Element;
 
 use error::Error;
-use super::MessagePayload;
 
 // TODO: also support components and servers.
 use ns::JABBER_CLIENT_NS;
@@ -11,8 +10,6 @@ pub struct Body {
     body: String,
 }
 
-impl MessagePayload for Body {}
-
 pub fn parse_body(root: &Element) -> Result<Body, Error> {
     if !root.is("body", JABBER_CLIENT_NS) {
         return Err(Error::ParseError("This is not a body element."));

src/chatstates.rs

@@ -1,7 +1,6 @@
 use minidom::Element;
 
 use error::Error;
-use super::MessagePayload;
 
 use ns::CHATSTATES_NS;
 
@@ -14,8 +13,6 @@ pub enum ChatState {
     Paused,
 }
 
-impl MessagePayload for ChatState {}
-
 pub fn parse_chatstate(root: &Element) -> Result<ChatState, Error> {
     for _ in root.children() {
         return Err(Error::ParseError("Unknown child in chatstate element."));

src/lib.rs

@@ -13,16 +13,19 @@ pub mod ping;
 pub mod chatstates;
 pub mod ibb;
 
-use std::fmt::Debug;
 use minidom::Element;
 
-pub trait MessagePayload: Debug {}
+#[derive(Debug)]
+pub enum MessagePayload {
+    Body(body::Body),
+    ChatState(chatstates::ChatState),
+}
 
-pub fn parse_message_payload(elem: &Element) -> Option<Box<MessagePayload>> {
+pub fn parse_message_payload(elem: &Element) -> Option<MessagePayload> {
     if let Ok(body) = body::parse_body(elem) {
-        Some(Box::new(body))
+        Some(MessagePayload::Body(body))
     } else if let Ok(chatstate) = chatstates::parse_chatstate(elem) {
-        Some(Box::new(chatstate))
+        Some(MessagePayload::ChatState(chatstate))
     } else {
         None
     }