diff --git a/crates/proto-xmpp/src/lib.rs b/crates/proto-xmpp/src/lib.rs
index e17e371..71e8a94 100644
--- a/crates/proto-xmpp/src/lib.rs
+++ b/crates/proto-xmpp/src/lib.rs
@@ -1,7 +1,5 @@
 #![feature(coroutines, coroutine_trait, type_alias_impl_trait, impl_trait_in_assoc_type)]
 
-extern crate core;
-
 pub mod bind;
 pub mod client;
 pub mod disco;
diff --git a/crates/proto-xmpp/src/mam.rs b/crates/proto-xmpp/src/mam.rs
index bd7ee21..41160d8 100644
--- a/crates/proto-xmpp/src/mam.rs
+++ b/crates/proto-xmpp/src/mam.rs
@@ -203,7 +203,7 @@ mod tests {
 
     #[test]
     fn test_parse_archive_query() {
-        let input = r#"<iq to='pubsub.shakespeare.lit' type='set' id='juliet1'><query xmlns='urn:xmpp:mam:2' queryid='f28'/></iq>";
+        let input = r#"<iq to='pubsub.shakespeare.lit' type='set' id='juliet1'><query xmlns='urn:xmpp:mam:2' queryid='f28'/></iq>"#;
 
         let result: Iq<MessageArchiveRequest> = parse(input).unwrap();
         assert_eq!(
@@ -224,7 +224,7 @@ mod tests {
 
     #[test]
     fn test_parse_query_messages_from_jid() {
-                let input = r#"<iq type='set' id='juliet1'><query xmlns='urn:xmpp:mam:2'><x xmlns='jabber:x:data' type='submit'><field var='FORM_TYPE' type='hidden'><value>value1</value></field><field var='with'><value>juliet@capulet.lit</value></field></x></query></iq>"#;
+        let input = r#"<iq type='set' id='juliet1'><query xmlns='urn:xmpp:mam:2'><x xmlns='jabber:x:data' type='submit'><field var='FORM_TYPE' type='hidden'><value>value1</value></field><field var='with'><value>juliet@capulet.lit</value></field></x></query></iq>"#;
 
         let result: Iq<MessageArchiveRequest> = parse(input).unwrap();
         assert_eq!(