diff --git a/src/servo/content/content_task.rs b/src/servo/content/content_task.rs
index 64c9a2ec0ff..9582103c088 100644
--- a/src/servo/content/content_task.rs
+++ b/src/servo/content/content_task.rs
@@ -96,8 +96,8 @@ pub struct Content {
     cx: @Cx,
     dom_static: GlobalStaticData,
 
-    document: Option<@Document>,
-    window:   Option<@Window>,
+    document: Option<@mut Document>,
+    window:   Option<@mut Window>,
     doc_url: Option<Url>,
     window_size: Size2D<uint>,
 
@@ -159,7 +159,7 @@ pub fn Content(layout_task: LayoutTask,
 
 pub fn task_from_context(cx: *JSContext) -> *mut Content {
     unsafe {
-        JS_GetContextPrivate(cx) as *Content
+        JS_GetContextPrivate(cx) as *mut Content
     }
 }
 
@@ -213,8 +213,8 @@ pub impl Content {
             let js_scripts = result.js_port.recv();
             debug!("js_scripts: %?", js_scripts);
 
-            let document = @Document(root);
-            let window   = @Window(self.control_chan.clone());
+            let document = @mut Document(root);
+            let window   = @mut Window(self.control_chan.clone());
 
             self.damage.add(MatchSelectorsDamage);
             self.relayout(document, &url);
diff --git a/src/servo/dom/bindings/clientrect.rs b/src/servo/dom/bindings/clientrect.rs
index 03e97163b92..1c7c0726af3 100644
--- a/src/servo/dom/bindings/clientrect.rs
+++ b/src/servo/dom/bindings/clientrect.rs
@@ -20,7 +20,7 @@ pub struct ClientRectImpl {
     right: f32,
 }
 
-pub impl ClientRect for ClientRectImpl {
+impl ClientRect for ClientRectImpl {
     fn Top() -> f32 {
         self.top
     }
@@ -53,8 +53,8 @@ pub fn ClientRect(top: f32, bottom: f32, left: f32, right: f32) -> ClientRectImp
     }
 }
 
-pub impl CacheableWrapper for ClientRectImpl {
-    fn get_wrappercache(&self) -> &WrapperCache {
+impl CacheableWrapper for ClientRectImpl {
+    fn get_wrappercache(&mut self) -> &mut WrapperCache {
         unsafe { cast::transmute(&self.wrapper) }
     }
 
diff --git a/src/servo/dom/bindings/clientrectlist.rs b/src/servo/dom/bindings/clientrectlist.rs
index 4241faf3717..92ac7da6d78 100644
--- a/src/servo/dom/bindings/clientrectlist.rs
+++ b/src/servo/dom/bindings/clientrectlist.rs
@@ -46,8 +46,8 @@ impl ClientRectListImpl {
     }
 }
 
-pub impl CacheableWrapper for ClientRectListImpl {
-    fn get_wrappercache(&self) -> &WrapperCache {
+impl CacheableWrapper for ClientRectListImpl {
+    fn get_wrappercache(&mut self) -> &mut WrapperCache {
         unsafe { cast::transmute(&self.wrapper) }
     }
 
diff --git a/src/servo/dom/bindings/codegen/CodegenRust.py b/src/servo/dom/bindings/codegen/CodegenRust.py
index a20f5ff2966..e35be6e3148 100644
--- a/src/servo/dom/bindings/codegen/CodegenRust.py
+++ b/src/servo/dom/bindings/codegen/CodegenRust.py
@@ -2424,7 +2424,7 @@ class CGAbstractMethod(CGThing):
 
 def CreateBindingJSObject(descriptor, parent):
     if descriptor.proxy:
-        handler = """  let cache = ptr::to_unsafe_ptr(aObject.get_wrappercache());
+        handler = """  //let cache = ptr::to_unsafe_ptr(aObject.get_wrappercache());
 
   let content = task_from_context(aCx);
   let handler = (*content).dom_static.proxy_handlers.get(&(prototypes::id::%s as uint));
@@ -2453,7 +2453,7 @@ class CGWrapWithCacheMethod(CGAbstractMethod):
     def __init__(self, descriptor):
         assert descriptor.interface.hasInterfacePrototypeObject()
         args = [Argument('*JSContext', 'aCx'), Argument('*JSObject', 'aScope'),
-                Argument('BindingReference<' + descriptor.nativeType + '>', 'aObject'),
+                Argument('&mut BindingReference<' + descriptor.nativeType + '>', 'aObject'),
                 Argument('*mut bool', 'aTriedToWrap')]
         CGAbstractMethod.__init__(self, descriptor, 'Wrap_', '*JSObject', args)
 
@@ -2463,8 +2463,8 @@ class CGWrapWithCacheMethod(CGAbstractMethod):
   return aObject->GetJSObject();"""
 
         return """  *aTriedToWrap = true;
-
-  let parent = WrapNativeParent(aCx, aScope, aObject.GetParentObject(aCx));
+  let mut parent = aObject.GetParentObject(aCx);
+  let parent = WrapNativeParent(aCx, aScope, &mut parent);
   if parent.is_null() {
     return ptr::null();
   }
@@ -2477,7 +2477,7 @@ class CGWrapWithCacheMethod(CGAbstractMethod):
     return ptr::null();
   }
 
-  let cache = ptr::to_unsafe_ptr(aObject.get_wrappercache());
+  let cache = ptr::to_mut_unsafe_ptr(aObject.get_wrappercache());
 
 %s
   //NS_ADDREF(aObject);
@@ -2496,7 +2496,8 @@ class CGWrapMethod(CGAbstractMethod):
         CGAbstractMethod.__init__(self, descriptor, 'Wrap', '*JSObject', args, inline=True, pub=True)
 
     def definition_body(self):
-        return "  return Wrap_(aCx, aScope, BindingReference(Left(aObject)), aTriedToWrap);"
+        return "  let mut binding = BindingReference(Left(aObject)); \
+  return Wrap_(aCx, aScope, &mut binding, aTriedToWrap);"
 
 class CGWrapNonWrapperCacheMethod(CGAbstractMethod):
     def __init__(self, descriptor):
@@ -3848,6 +3849,7 @@ class CGBindingRoot(CGThing):
                           'dom::bindings::clientrect::*', #XXXjdm
                           'dom::bindings::clientrectlist::*', #XXXjdm
                           'dom::bindings::proxyhandler::*',
+                          'content::content_task::task_from_context'
                          ], 
                          curr)
 
diff --git a/src/servo/dom/bindings/conversions.rs b/src/servo/dom/bindings/conversions.rs
index c6575f1e907..a53951379c5 100644
--- a/src/servo/dom/bindings/conversions.rs
+++ b/src/servo/dom/bindings/conversions.rs
@@ -6,7 +6,7 @@ pub trait JSValConvertible<T> {
     static fn from_jsval(val: JSVal) -> Option<T>;
 }
 
-pub impl JSValConvertible<u32> for u32 {
+impl JSValConvertible<u32> for u32 {
     fn to_jsval(&self) -> JSVal {
         RUST_INT_TO_JSVAL(*self as i32)
     }
diff --git a/src/servo/dom/bindings/document.rs b/src/servo/dom/bindings/document.rs
index 53668365bef..8c8df125c61 100644
--- a/src/servo/dom/bindings/document.rs
+++ b/src/servo/dom/bindings/document.rs
@@ -17,6 +17,7 @@ use dom::bindings::node::create;
 use dom::document::Document;
 use dom::bindings::node;
 use dom::bindings::utils;
+use dom::node::Node;
 
 enum DOMException {
     INVALID_CHARACTER_ERR
@@ -70,16 +71,16 @@ extern fn getDocumentElement(cx: *JSContext, _argc: c_uint, vp: *mut JSVal) -> J
             return 0;
         }
 
-        let doc = &(*unwrap(obj)).payload;
-        *vp = RUST_OBJECT_TO_JSVAL(node::create(cx, doc.root).ptr);
+        let doc = &mut (*unwrap(obj)).payload;
+        *vp = RUST_OBJECT_TO_JSVAL(node::create(cx, &mut doc.root).ptr);
         return 1;
     }
 }
 
-unsafe fn unwrap(obj: *JSObject) -> *rust_box<Document> {
+unsafe fn unwrap(obj: *JSObject) -> *mut rust_box<Document> {
     //TODO: some kind of check if this is a Document object
     let val = JS_GetReservedSlot(obj, 0);
-    cast::reinterpret_cast(&RUST_JSVAL_TO_PRIVATE(val))
+    RUST_JSVAL_TO_PRIVATE(val) as *mut rust_box<Document>
 }
 
 extern fn finalize(_fop: *JSFreeOp, obj: *JSObject) {
@@ -90,7 +91,7 @@ extern fn finalize(_fop: *JSFreeOp, obj: *JSObject) {
     }
 }
 
-pub fn init(compartment: @mut Compartment, doc: @Document) {
+pub fn init(compartment: @mut Compartment, doc: @mut Document) {
     let obj = utils::define_empty_prototype(~"Document", None, compartment);
 
     let attrs = @~[
diff --git a/src/servo/dom/bindings/element.rs b/src/servo/dom/bindings/element.rs
index 072a4a47fe5..ba2c139003a 100644
--- a/src/servo/dom/bindings/element.rs
+++ b/src/servo/dom/bindings/element.rs
@@ -1,5 +1,4 @@
 use content::content_task::{Content, task_from_context};
-use dom::bindings::node::unwrap;
 use dom::bindings::utils::{rust_box, squirrel_away_unique, get_compartment};
 use dom::bindings::utils::{domstring_to_jsval, WrapNewBindingObject};
 use dom::bindings::utils::{str, CacheableWrapper, DOM_OBJECT_SLOT};
@@ -26,7 +25,8 @@ extern fn finalize(_fop: *JSFreeOp, obj: *JSObject) {
     debug!("element finalize!");
     unsafe {
         let val = JS_GetReservedSlot(obj, DOM_OBJECT_SLOT as u32);
-        let _node: ~AbstractNode = cast::reinterpret_cast(&RUST_JSVAL_TO_PRIVATE(val));
+        let node: AbstractNode = cast::reinterpret_cast(&RUST_JSVAL_TO_PRIVATE(val));
+        let elem: ~Element = cast::transmute(node.raw_object());
     }
 }
 
@@ -93,8 +93,8 @@ pub fn init(compartment: @mut Compartment) {
 extern fn getClientRects(cx: *JSContext, argc: c_uint, vp: *JSVal) -> JSBool {
   unsafe {
       let obj = JS_THIS_OBJECT(cx, vp);
-      let box = utils::unwrap::<*rust_box<AbstractNode>>(obj);
-      let node = &(*box).payload;
+      let mut box = utils::unwrap::<*mut AbstractNode>(obj);
+      let node = &mut *box;
       let rval = do node.with_imm_element |elem| {
           elem.getClientRects()
       };
@@ -102,9 +102,9 @@ extern fn getClientRects(cx: *JSContext, argc: c_uint, vp: *JSVal) -> JSBool {
           JS_SET_RVAL(cx, vp, JSVAL_NULL);
       } else {
           let cache = node.get_wrappercache();
-          assert WrapNewBindingObject(cx, cache.get_wrapper(),
-                                      rval.get(),
-                                      cast::transmute(vp));
+          fail_unless!(WrapNewBindingObject(cx, cache.get_wrapper(),
+                                            rval.get(),
+                                            cast::transmute(vp)));
       }
       return 1;
   }
@@ -118,7 +118,8 @@ extern fn HTMLImageElement_getWidth(cx: *JSContext, _argc: c_uint, vp: *mut JSVa
             return 0;
         }
 
-        let node = &(*unwrap(obj)).payload;
+        let mut box = utils::unwrap::<*mut AbstractNode>(obj);
+        let node = &mut *box;
         let width = match node.type_id() {
             ElementNodeTypeId(HTMLImageElementTypeId) => {
                 let content = task_from_context(cx);
@@ -147,7 +148,8 @@ extern fn HTMLImageElement_setWidth(cx: *JSContext, _argc: c_uint, vp: *mut JSVa
             return 0;
         }
 
-        let node = &(*unwrap(obj)).payload;
+        let mut box = utils::unwrap::<*mut AbstractNode>(obj);
+        let node = &mut *box;
         match node.type_id() {
             ElementNodeTypeId(HTMLImageElementTypeId) => {
                 do node.as_mut_element |elem| {
@@ -171,7 +173,8 @@ extern fn getTagName(cx: *JSContext, _argc: c_uint, vp: *mut JSVal) -> JSBool {
             return 0;
         }
 
-        let node = &(*unwrap(obj)).payload;
+        let mut box = utils::unwrap::<*mut AbstractNode>(obj);
+        let node = &mut *box;
         do node.with_imm_element |elem| {
             let s = str(copy elem.tag_name);
             *vp = domstring_to_jsval(cx, &s);            
@@ -181,7 +184,7 @@ extern fn getTagName(cx: *JSContext, _argc: c_uint, vp: *mut JSVal) -> JSBool {
 }
 
 #[allow(non_implicitly_copyable_typarams)]
-pub fn create(cx: *JSContext, node: AbstractNode) -> jsobj {
+pub fn create(cx: *JSContext, node: &mut AbstractNode) -> jsobj {
     let proto = match node.type_id() {
         ElementNodeTypeId(HTMLDivElementTypeId) => ~"HTMLDivElement",
         ElementNodeTypeId(HTMLHeadElementTypeId) => ~"HTMLHeadElement",
@@ -201,7 +204,7 @@ pub fn create(cx: *JSContext, node: AbstractNode) -> jsobj {
     node.get_wrappercache().set_wrapper(obj.ptr);
 
     unsafe {
-        let raw_ptr = squirrel_away_unique(~node) as *libc::c_void;
+        let raw_ptr = ptr::addr_of(node) as *libc::c_void;
         JS_SetReservedSlot(obj.ptr, DOM_OBJECT_SLOT as u32, RUST_PRIVATE_TO_JSVAL(raw_ptr));
     }
 
diff --git a/src/servo/dom/bindings/node.rs b/src/servo/dom/bindings/node.rs
index e5c5fd2181b..f32128fd69d 100644
--- a/src/servo/dom/bindings/node.rs
+++ b/src/servo/dom/bindings/node.rs
@@ -60,7 +60,7 @@ pub fn init(compartment: @mut Compartment) {
 }
 
 #[allow(non_implicitly_copyable_typarams)]
-pub fn create(cx: *JSContext, node: AbstractNode) -> jsobj {
+pub fn create(cx: *JSContext, node: &mut AbstractNode) -> jsobj {
     match node.type_id() {
         ElementNodeTypeId(_) => element::create(cx, node),
         TextNodeTypeId    => fail!(~"no text node bindings yet"),
@@ -69,7 +69,7 @@ pub fn create(cx: *JSContext, node: AbstractNode) -> jsobj {
      }
 }
 
-pub unsafe fn unwrap(obj: *JSObject) -> *rust_box<AbstractNode> {
+pub unsafe fn unwrap(obj: *JSObject) -> *AbstractNode {
     let val = js::GetReservedSlot(obj, DOM_OBJECT_SLOT as u64);
     cast::transmute(JSVAL_TO_PRIVATE(val))
 }
@@ -82,8 +82,8 @@ extern fn getFirstChild(cx: *JSContext, _argc: c_uint, vp: *mut JSVal) -> JSBool
             return 0;
         }
 
-        let node = &(*unwrap(obj)).payload;
-        let rval = do node.with_imm_node |node| {
+        let node = *unwrap(obj);
+        let rval = do node.with_mut_node |node| {
             node.getFirstChild()
         };
         match rval {
@@ -105,19 +105,9 @@ extern fn getNextSibling(cx: *JSContext, _argc: c_uint, vp: *mut JSVal) -> JSBoo
             return 0;
         }
 
-        let node = &(*unwrap(obj)).payload;
-        let rval = do node.with_imm_node |node| {
+        let node = *unwrap(obj);
+        let rval = do node.with_mut_node |node| {
             node.getNextSibling()
-<<<<<<< HEAD
-        };
-        match rval {
-            Some(n) => {
-                let obj = create(cx, n).ptr;
-                *vp = RUST_OBJECT_TO_JSVAL(obj)
-            }
-            None => *vp = JSVAL_NULL
-        }
-=======
         };
         match rval {
             Some(n) => {
@@ -126,7 +116,6 @@ extern fn getNextSibling(cx: *JSContext, _argc: c_uint, vp: *mut JSVal) -> JSBoo
             }
             None => *vp = JSVAL_NULL
         };
->>>>>>> Generate working ClientRectList and ClientRect bindings that can wrap, call methods, and access properties.
     }
     return 1;
 }
@@ -141,20 +130,23 @@ impl Node {
         }
     }
 
-    fn getNextSibling(&self) -> Option<AbstractNode> {
-        self.next_sibling
-<<<<<<< HEAD
-=======
+    fn getNextSibling(&mut self) -> Option<&mut AbstractNode> {
+        match self.next_sibling {
+          // transmute because the compiler can't deduce that the reference
+          // is safe outside of with_mut_node blocks.
+          Some(ref mut n) => Some(unsafe { cast::transmute(n) }),
+          None => None
+        }
     }
 
-    fn getFirstChild(&self) -> Option<AbstractNode> {
-        self.first_child
->>>>>>> Generate working ClientRectList and ClientRect bindings that can wrap, call methods, and access properties.
+    fn getFirstChild(&mut self) -> Option<&mut AbstractNode> {
+        match self.first_child {
+          // transmute because the compiler can't deduce that the reference
+          // is safe outside of with_mut_node blocks.
+          Some(ref mut n) => Some(unsafe { cast::transmute(n) }),
+          None => None
+        }
     }
-
-    fn getFirstChild(&self) -> Option<AbstractNode> {
-        self.first_child
-     }
  }
 
 extern fn getNodeType(cx: *JSContext, _argc: c_uint, vp: *mut JSVal) -> JSBool {
@@ -164,7 +156,7 @@ extern fn getNodeType(cx: *JSContext, _argc: c_uint, vp: *mut JSVal) -> JSBool {
             return 0;
         }
 
-        let node = &(*unwrap(obj)).payload;
+        let node = *unwrap(obj);
         let rval = do node.with_imm_node |node| {
             node.getNodeType()
         };
@@ -174,8 +166,8 @@ extern fn getNodeType(cx: *JSContext, _argc: c_uint, vp: *mut JSVal) -> JSBool {
 }
 
 impl CacheableWrapper for AbstractNode {
-    fn get_wrappercache(&self) -> &WrapperCache {
-        do self.with_imm_node |n| {
+    fn get_wrappercache(&mut self) -> &mut WrapperCache {
+        do self.with_mut_node |n| {
             unsafe { cast::transmute(&n.wrapper) }
         }
     }
diff --git a/src/servo/dom/bindings/proxyhandler.rs b/src/servo/dom/bindings/proxyhandler.rs
index 03ccbd747f4..4d984271414 100644
--- a/src/servo/dom/bindings/proxyhandler.rs
+++ b/src/servo/dom/bindings/proxyhandler.rs
@@ -8,7 +8,7 @@ use core::sys::size_of;
 
 type c_bool = libc::c_int;
 
-extern fn getPropertyDescriptor(cx: *JSContext, proxy: *JSObject, id: jsid,
+pub extern fn getPropertyDescriptor(cx: *JSContext, proxy: *JSObject, id: jsid,
                                 set: c_bool, desc: *mut JSPropertyDescriptor) -> c_bool {
   unsafe {
     if _getOwnPropertyDescriptor(cx, proxy, id, set, desc) == 0 {
@@ -50,12 +50,12 @@ fn _getOwnPropertyDescriptor(cx: *JSContext, proxy: *JSObject, id: jsid,
   }
 }
 
-extern fn getOwnPropertyDescriptor(cx: *JSContext, proxy: *JSObject, id: jsid,
+pub extern fn getOwnPropertyDescriptor(cx: *JSContext, proxy: *JSObject, id: jsid,
                                    set: c_bool, desc: *mut JSPropertyDescriptor) -> c_bool {
     _getOwnPropertyDescriptor(cx, proxy, id, set, desc)
 }
 
-fn _obj_toString(cx: *JSContext, className: *libc::c_char) -> *JSString {
+pub fn _obj_toString(cx: *JSContext, className: *libc::c_char) -> *JSString {
   unsafe {
     let name = str::raw::from_buf(className as *u8);
     let nchars = "[object ]".len() + name.len();
diff --git a/src/servo/dom/bindings/utils.rs b/src/servo/dom/bindings/utils.rs
index 9e633205e8c..9d2b5a135b4 100644
--- a/src/servo/dom/bindings/utils.rs
+++ b/src/servo/dom/bindings/utils.rs
@@ -14,8 +14,8 @@ use js::jsapi::bindgen::{JS_ValueToString, JS_GetStringCharsZAndLength, JS_Repor
                          JS_GetInternedStringCharsAndLength, JS_DefineProperties,
                          JS_WrapValue, JS_GetObjectPrototype, JS_ForwardGetPropertyTo,
                          JS_HasPropertyById, JS_GetPrototype, JS_GetGlobalForObject};
-use js::jsfriendapi::bindgen::{DefineFunctionWithReserved, GetObjectJSClass,
-                               JS_NewObjectWithUniqueType};
+use js::jsfriendapi::bindgen::JS_NewObjectWithUniqueType;
+use js::glue::bindgen::{DefineFunctionWithReserved, GetObjectJSClass};
 use js::glue::{PROPERTY_STUB, STRICT_PROPERTY_STUB, ENUMERATE_STUB, CONVERT_STUB,
                   RESOLVE_STUB};
 use js::glue::bindgen::*;
@@ -29,10 +29,10 @@ const TOSTRING_CLASS_RESERVED_SLOT: u64 = 0;
 const TOSTRING_NAME_RESERVED_SLOT: u64 = 1;
 
 struct GlobalStaticData {
-    mut proxy_handlers: linear::LinearMap<uint, *libc::c_void>,
-    mut attribute_ids: linear::LinearMap<uint, ~[mut jsid]>,
-    mut method_ids: linear::LinearMap<uint, ~[mut jsid]>,
-    mut constant_ids: linear::LinearMap<uint, ~[mut jsid]>
+    proxy_handlers: linear::LinearMap<uint, *libc::c_void>,
+    attribute_ids: linear::LinearMap<uint, ~[jsid]>,
+    method_ids: linear::LinearMap<uint, ~[jsid]>,
+    constant_ids: linear::LinearMap<uint, ~[jsid]>
 }
 
 pub fn GlobalStaticData() -> GlobalStaticData {
@@ -107,7 +107,7 @@ pub unsafe fn unwrap<T>(obj: *JSObject) -> T {
     cast::transmute(RUST_JSVAL_TO_PRIVATE(val))
 }
 
-pub unsafe fn squirrel_away<T>(x: @T) -> *rust_box<T> {
+pub unsafe fn squirrel_away<T>(x: @mut T) -> *rust_box<T> {
     let y: *rust_box<T> = cast::reinterpret_cast(&x);
     cast::forget(x);
     y
@@ -341,15 +341,15 @@ pub struct DOMJSClass {
     dom_class: DOMClass
 }
 
-fn GetProtoOrIfaceArray(global: *JSObject) -> **JSObject {
+pub fn GetProtoOrIfaceArray(global: *JSObject) -> **JSObject {
     unsafe {
         /*assert ((*JS_GetClass(global)).flags & JSCLASS_DOM_GLOBAL) != 0;*/
         cast::transmute(RUST_JSVAL_TO_PRIVATE(JS_GetReservedSlot(global, DOM_PROTOTYPE_SLOT)))
     }
 }
 
-mod prototypes {
-    mod id {
+pub mod prototypes {
+    pub mod id {
         pub enum Prototype {
             ClientRect,
             ClientRectList,
@@ -417,7 +417,7 @@ fn CreateInterfaceObject(cx: *JSContext, global: *JSObject, receiver: *JSObject,
             JS_NewObject(cx, constructorClass, functionProto, global)
         }
     } else {
-        assert constructorNative.is_not_null();
+        fail_unless!(constructorNative.is_not_null());
         let fun = JS_NewFunction(cx, constructorNative, ctorNargs,
                                  JSFUN_CONSTRUCTOR, global, name);
         if fun.is_null() {
@@ -540,7 +540,7 @@ pub extern fn ThrowingConstructor(cx: *JSContext, argc: uint, vp: *JSVal) -> JSB
 }
 
 pub fn initialize_global(global: *JSObject) {
-    let protoArray = @[0 as *JSObject, ..2]; //XXXjdm number of constructors
+    let protoArray = @mut [0 as *JSObject, ..2]; //XXXjdm number of constructors
     unsafe {
         //XXXjdm we should be storing the box pointer instead of the inner
         let box = squirrel_away(protoArray);
@@ -552,21 +552,21 @@ pub fn initialize_global(global: *JSObject) {
 }
 
 pub trait CacheableWrapper {
-    fn get_wrappercache(&self) -> &WrapperCache;
+    fn get_wrappercache(&mut self) -> &mut WrapperCache;
     fn wrap_object_unique(~self, cx: *JSContext, scope: *JSObject) -> *JSObject;
     fn wrap_object_shared(@self, cx: *JSContext, scope: *JSObject) -> *JSObject;
 }
 
 pub struct WrapperCache {
-    mut wrapper: *JSObject
+    wrapper: *JSObject
 }
 
-impl WrapperCache {
+pub impl WrapperCache {
     fn get_wrapper(&self) -> *JSObject {
         unsafe { cast::transmute(self.wrapper) }
     }
 
-    fn set_wrapper(&self, wrapper: *JSObject) {
+    fn set_wrapper(&mut self, wrapper: *JSObject) {
         unsafe { self.wrapper = wrapper; }
     }
 
@@ -578,7 +578,7 @@ impl WrapperCache {
 }
 
 pub fn WrapNewBindingObject<T: CacheableWrapper>(cx: *JSContext, scope: *JSObject,
-                                                 value: ~T, vp: *mut JSVal) -> bool {
+                                                 mut value: ~T, vp: *mut JSVal) -> bool {
   unsafe {
     let obj = value.get_wrappercache().get_wrapper();
     if obj.is_not_null() /*&& js::GetObjectCompartment(obj) == js::GetObjectCompartment(scope)*/ {
@@ -604,17 +604,21 @@ pub fn WrapNewBindingObject<T: CacheableWrapper>(cx: *JSContext, scope: *JSObjec
 
 pub struct OpaqueBindingReference(Either<~CacheableWrapper, @CacheableWrapper>);
 
-pub fn WrapNativeParent(cx: *JSContext, scope: *JSObject, p: OpaqueBindingReference) -> *JSObject {
+pub fn WrapNativeParent(cx: *JSContext, scope: *JSObject, p: &mut OpaqueBindingReference) -> *JSObject {
     match p {
-      OpaqueBindingReference(Left(p)) => {
-        let obj = p.get_wrappercache().get_wrapper();
+      &OpaqueBindingReference(Left(ref mut p)) => {
+        let cache = p.get_wrappercache();
+        let obj = cache.get_wrapper();
         if obj.is_not_null() {
             return obj;
         }
-        p.wrap_object_unique(cx, scope)
+        let mut tmp: ~CacheableWrapper = unstable::intrinsics::init();
+        tmp <-> *p;
+        tmp.wrap_object_unique(cx, scope)
       }
-      OpaqueBindingReference(Right(p)) => {
-        let obj = p.get_wrappercache().get_wrapper();
+      &OpaqueBindingReference(Right(ref mut p)) => {
+        let cache = p.get_wrappercache();
+        let obj = cache.get_wrapper();
         if obj.is_not_null() {
             return obj;
         }
@@ -623,7 +627,7 @@ pub fn WrapNativeParent(cx: *JSContext, scope: *JSObject, p: OpaqueBindingRefere
     }
 }
 
-pub struct BindingReference<T>(Either<~T, @T>);
+pub struct BindingReference<T>(Either<~T, @mut T>);
 
 pub trait BindingObject {
     fn GetParentObject(&self, cx: *JSContext) -> OpaqueBindingReference;
@@ -637,17 +641,19 @@ pub impl<T: BindingObject + CacheableWrapper> BindingReference<T> {
         }
     }
 
-    fn get_wrappercache(&self) -> &self/WrapperCache {
+    fn get_wrappercache(&mut self) -> &self/mut WrapperCache {
         match **self {
-          Left(ref obj) => obj.get_wrappercache(),
-          Right(ref obj) => obj.get_wrappercache()
+          Left(ref mut obj) => obj.get_wrappercache(),
+          Right(ref mut obj) => obj.get_wrappercache()
         }
     }
 }
 
-pub fn squirrel_away_ref<R>(obj: BindingReference<R>) -> *rust_box<R> {
+pub fn squirrel_away_ref<R>(obj: &mut BindingReference<R>) -> *rust_box<R> {
+    let mut tmp: BindingReference<R> = unstable::intrinsics::init();
+    tmp <-> *obj;
     unsafe {
-        match obj {
+        match tmp {
             BindingReference(Left(obj)) => squirrel_away_unique(obj),
             BindingReference(Right(obj)) => squirrel_away(obj)
         }
@@ -756,7 +762,7 @@ fn InternJSString(cx: *JSContext, chars: *libc::c_char) -> Option<jsid> {
     }
 }
 
-pub fn InitIds(cx: *JSContext, specs: &[JSPropertySpec], ids: &[mut jsid]) -> bool {
+pub fn InitIds(cx: *JSContext, specs: &[JSPropertySpec], ids: &mut [jsid]) -> bool {
     let mut rval = true;
     for specs.eachi |i, spec| {
         if spec.name.is_null() == true {
diff --git a/src/servo/dom/bindings/window.rs b/src/servo/dom/bindings/window.rs
index 469cf10c681..475fe4a2b7a 100644
--- a/src/servo/dom/bindings/window.rs
+++ b/src/servo/dom/bindings/window.rs
@@ -76,7 +76,7 @@ extern fn finalize(_fop: *JSFreeOp, obj: *JSObject) {
     }
 }
 
-pub fn init(compartment: @mut Compartment, win: @Window) {
+pub fn init(compartment: @mut Compartment, win: @mut Window) {
     let proto = utils::define_empty_prototype(~"Window", None, compartment);
     compartment.register_class(utils::instance_jsclass(~"WindowInstance", finalize));
 
@@ -132,8 +132,8 @@ pub fn init(compartment: @mut Compartment, win: @Window) {
                                 JSPROP_ENUMERATE);
 }
 
-pub impl CacheableWrapper for Window {
-    fn get_wrappercache(&self) -> &WrapperCache {
+impl CacheableWrapper for Window {
+    fn get_wrappercache(&mut self) -> &mut WrapperCache {
         unsafe { cast::transmute(&self.wrapper) }
     }
 
diff --git a/src/servo/dom/node.rs b/src/servo/dom/node.rs
index 408c60942a8..54a86bf871f 100644
--- a/src/servo/dom/node.rs
+++ b/src/servo/dom/node.rs
@@ -33,7 +33,6 @@ use std::arc::ARC;
 /// FIXME: This should be replaced with a trait once they can inherit from structs.
 pub struct AbstractNode {
     priv obj: *mut Node,
-    //wrapper: WrapperCache
 }
 
 impl Eq for AbstractNode {
@@ -316,6 +315,10 @@ pub impl AbstractNode {
     fn is_style_element(self) -> bool {
         self.type_id() == ElementNodeTypeId(HTMLStyleElementTypeId)
     }
+
+    unsafe fn raw_object(self) -> *mut Node {
+        self.obj
+    }
 }
 
 impl DebugMethods for AbstractNode {
@@ -355,7 +358,6 @@ impl Node {
         // This surrenders memory management of the node!
         AbstractNode {
             obj: transmute(node),
-            //wrapper: WrapperCache::new()
         }
     }
 
@@ -375,17 +377,17 @@ impl Node {
     }
 }
 
-pub fn define_bindings(compartment: @mut Compartment, doc: @Document, win: @Window) {
+pub fn define_bindings(compartment: @mut Compartment, doc: @mut Document, win: @mut Window) {
     bindings::window::init(compartment, win);
     bindings::document::init(compartment, doc);
     bindings::node::init(compartment);
     bindings::element::init(compartment);
     bindings::utils::initialize_global(compartment.global_obj.ptr);
     let mut unused = false;
-    assert codegen::ClientRectBinding::DefineDOMInterface(compartment.cx.ptr,
-                                                          compartment.global_obj.ptr,
-                                                          &mut unused);
-    assert codegen::ClientRectListBinding::DefineDOMInterface(compartment.cx.ptr,
-                                                              compartment.global_obj.ptr,
-                                                              &mut unused);
+    fail_unless!(codegen::ClientRectBinding::DefineDOMInterface(compartment.cx.ptr,
+                                                                compartment.global_obj.ptr,
+                                                                &mut unused));
+    fail_unless!(codegen::ClientRectListBinding::DefineDOMInterface(compartment.cx.ptr,
+                                                                    compartment.global_obj.ptr,
+                                                                    &mut unused));
 }