diff --git a/src/components/script/dom/bindings/js.rs b/src/components/script/dom/bindings/js.rs
index e273dfc7bad..b83115e289d 100644
--- a/src/components/script/dom/bindings/js.rs
+++ b/src/components/script/dom/bindings/js.rs
@@ -60,7 +60,7 @@ use std::mem;
 pub struct Temporary<T> {
     inner: JS<T>,
     /// On-stack JS pointer to assuage conservative stack scanner
-    js_ptr: *mut JSObject,
+    _js_ptr: *mut JSObject,
 }
 
 impl<T> PartialEq for Temporary<T> {
@@ -74,7 +74,7 @@ impl<T: Reflectable> Temporary<T> {
     pub fn new(inner: JS<T>) -> Temporary<T> {
         Temporary {
             inner: inner,
-            js_ptr: inner.reflector().get_jsobject(),
+            _js_ptr: inner.reflector().get_jsobject(),
         }
     }
 
@@ -388,8 +388,6 @@ pub struct Root<'a, 'b, T> {
     root_list: &'a RootCollection,
     /// Reference to rooted value that must not outlive this container
     jsref: JSRef<'b, T>,
-    /// Pointer to underlying Rust data
-    ptr: *T,
     /// On-stack JS pointer to assuage conservative stack scanner
     js_ptr: *mut JSObject,
 }
@@ -405,7 +403,6 @@ impl<'a, 'b, T: Reflectable> Root<'a, 'b, T> {
                 ptr: unrooted.ptr.clone(),
                 chain: ContravariantLifetime,
             },
-            ptr: unrooted.ptr.clone(),
             js_ptr: unrooted.reflector().get_jsobject(),
         };
         roots.root(&root);
diff --git a/src/components/script/dom/characterdata.rs b/src/components/script/dom/characterdata.rs
index 9ae21154cfb..8e2d94081f8 100644
--- a/src/components/script/dom/characterdata.rs
+++ b/src/components/script/dom/characterdata.rs
@@ -98,7 +98,7 @@ impl<'a> CharacterDataMethods for JSRef<'a, CharacterData> {
         let mut data = self.data.deref().borrow().as_slice().slice(0, offset as uint).to_string();
         data.push_str(arg.as_slice());
         data.push_str(self.data.deref().borrow().as_slice().slice((offset + count) as uint, length as uint));
-        *self.data.deref().borrow_mut() = data.into_owned();
+        *self.data.deref().borrow_mut() = data;
         // FIXME: Once we have `Range`, we should implement step7 to step11
         Ok(())
     }
diff --git a/src/components/script/dom/htmlcollection.rs b/src/components/script/dom/htmlcollection.rs
index 64bf42ecfe5..2f92c858398 100644
--- a/src/components/script/dom/htmlcollection.rs
+++ b/src/components/script/dom/htmlcollection.rs
@@ -103,7 +103,7 @@ impl HTMLCollection {
             }
         }
         let filter = ClassNameFilter {
-            classes: split_html_space_chars(classes.as_slice()).map(|class| class.into_owned()).collect()
+            classes: split_html_space_chars(classes.as_slice()).map(|class| class.to_string()).collect()
         };
         HTMLCollection::create(window, root, box filter)
     }
diff --git a/src/components/script/dom/htmlserializer.rs b/src/components/script/dom/htmlserializer.rs
index 88866d6e1e7..3f2b753c55b 100644
--- a/src/components/script/dom/htmlserializer.rs
+++ b/src/components/script/dom/htmlserializer.rs
@@ -62,7 +62,7 @@ pub fn serialize(iterator: &mut NodeIterator) -> String {
         html.push_str(open_elements.pop().unwrap().as_slice());
         html.push_str(">");
     }
-    html.into_owned()
+    html
 }
 
 fn serialize_comment(comment: &JSRef<Comment>, html: &mut String) {
diff --git a/src/components/script/dom/node.rs b/src/components/script/dom/node.rs
index def4ee6248d..9892f0b5f27 100644
--- a/src/components/script/dom/node.rs
+++ b/src/components/script/dom/node.rs
@@ -157,8 +157,8 @@ pub struct SharedLayoutData {
 /// Encapsulates the abstract layout data.
 pub struct LayoutData {
     chan: Option<LayoutChan>,
-    shared_data: SharedLayoutData,
-    data: *(),
+    _shared_data: SharedLayoutData,
+    _data: *(),
 }
 
 pub struct LayoutDataRef {
@@ -1539,7 +1539,7 @@ impl<'a> NodeMethods for JSRef<'a, Node> {
                         content.push_str(text.deref().characterdata.data.deref().borrow().as_slice());
                     }
                 }
-                Some(content.into_owned())
+                Some(content)
             }
             CommentNodeTypeId |
             TextNodeTypeId |