auto merge of #608 : kmcallister/servo/script-exit, r=metajack

src/components/main/constellation.rs

@@ -254,12 +254,10 @@ impl Constellation {
         // Don't navigate on Navigate type, because that is handled by forward/back
         match pipeline.navigation_type.get() {
             constellation_msg::Load => {
-                let _evicted = self.navigation_context.navigate(id);
-                /* FIXME(tkuehn): the following code causes a segfault
+                let evicted = self.navigation_context.navigate(id);
                 for evicted.iter().advance |id| {
                     self.pipelines.get(id).exit();
                 }
-                */
             }
             _ => {}
         }

src/components/script/dom/node.rs

@@ -223,6 +223,10 @@ impl<'self, View> AbstractNode<View> {
     /// Sets the layout data, unsafely casting the type as layout wishes. Only layout is allowed
     /// to call this. This is wildly unsafe and is therefore marked as such.
     pub unsafe fn unsafe_set_layout_data<T>(self, data: @mut T) {
+        // Don't decrement the refcount on data, since we're giving it to the
+        // base structure.
+        cast::forget(data);
+
         do self.with_mut_base |base| {
             base.layout_data = Some(transmute(data))
         }

src/components/script/script_task.rs

@@ -167,15 +167,6 @@ pub fn task_from_context(js_context: *JSContext) -> *mut ScriptTask {
     }
 }
 
-#[unsafe_destructor]
-impl Drop for ScriptTask {
-    fn drop(&self) {
-        unsafe {
-            let _ = local_data::local_data_pop(global_script_context_key);
-        }
-    }
-}
-
 impl ScriptTask {
     /// Creates a new script task.
     pub fn new(id: uint,
@@ -362,7 +353,11 @@ impl ScriptTask {
             frame.document.teardown();
         }
 
-        self.layout_chan.send(layout_interface::ExitMsg)
+        self.layout_chan.send(layout_interface::ExitMsg);
+
+        unsafe {
+            let _ = local_data::local_data_pop(global_script_context_key);
+        }
     }
 
     /// The entry point to document loading. Defines bindings, sets up the window and document