iq: Implement the Iq*Payload traits on every possible payload.

src/disco.rs

@@ -14,6 +14,7 @@ use jid::Jid;
 use error::Error;
 use ns;
 
+use iq::{IqGetPayload, IqResultPayload};
 use data_forms::{DataForm, DataFormType};
 
 generate_element_with_only_attributes!(
@@ -26,6 +27,8 @@ DiscoInfoQuery, "query", DISCO_INFO, [
     node: Option<String> = "node" => optional,
 ]);
 
+impl IqGetPayload for DiscoItemsQuery {}
+
 generate_element_with_only_attributes!(
 /// Structure representing a `<feature xmlns='http://jabber.org/protocol/disco#info'/>` element.
 #[derive(PartialEq)]
@@ -108,6 +111,8 @@ pub struct DiscoInfoResult {
     pub extensions: Vec<DataForm>,
 }
 
+impl IqResultPayload for DiscoInfoResult {}
+
 impl TryFrom<Element> for DiscoInfoResult {
     type Err = Error;
 
@@ -190,6 +195,8 @@ DiscoItemsQuery, "query", DISCO_ITEMS, [
     node: Option<String> = "node" => optional,
 ]);
 
+impl IqGetPayload for DiscoInfoResult {}
+
 generate_element_with_only_attributes!(
 /// Structure representing an `<item xmlns='http://jabber.org/protocol/disco#items'/>` element.
 Item, "item", DISCO_ITEMS, [
@@ -218,6 +225,8 @@ generate_element_with_children!(
     ]
 );
 
+impl IqResultPayload for DiscoItemsResult {}
+
 #[cfg(test)]
 mod tests {
     use super::*;