Warning police.

1 files changed, 6 insertions, 6 deletions

diff --git a/src/components/script/dom/domimplementation.rs b/src/components/script/dom/domimplementation.rs
index 5a11d0119d4..71f63f52066 100644
--- a/src/components/script/dom/domimplementation.rs
+++ b/src/components/script/dom/domimplementation.rs
@@ -72,18 +72,18 @@ impl DOMImplementation {
         {
             // Step 3.
             let doc_type = DocumentType::new(~"html", None, None, &doc);
-            doc_node.AppendChild(&mut NodeCast::from(&doc_type));
+            assert!(doc_node.AppendChild(&mut NodeCast::from(&doc_type)).is_ok());
         }
 
         {
             // Step 4.
             let mut doc_html = NodeCast::from(&HTMLHtmlElement::new(~"html", &doc));
-            doc_node.AppendChild(&mut doc_html);
+            assert!(doc_node.AppendChild(&mut doc_html).is_ok());
 
             {
                 // Step 5.
                 let mut doc_head = NodeCast::from(&HTMLHeadElement::new(~"head", &doc));
-                doc_html.AppendChild(&mut doc_head);
+                assert!(doc_html.AppendChild(&mut doc_head).is_ok());
 
                 // Step 6.
                 match title {
@@ -91,18 +91,18 @@ impl DOMImplementation {
                     Some(title_str) => {
                         // Step 6.1.
                         let mut doc_title = NodeCast::from(&HTMLTitleElement::new(~"title", &doc));
-                        doc_head.AppendChild(&mut doc_title);
+                        assert!(doc_head.AppendChild(&mut doc_title).is_ok());
 
                         // Step 6.2.
                         let title_text = Text::new(title_str, &doc);
-                        doc_title.AppendChild(&mut NodeCast::from(&title_text));
+                        assert!(doc_title.AppendChild(&mut NodeCast::from(&title_text)).is_ok());
                     }
                 }
             }
 
             // Step 7.
             let doc_body = HTMLBodyElement::new(~"body", &doc);
-            doc_html.AppendChild(&mut NodeCast::from(&doc_body));
+            assert!(doc_html.AppendChild(&mut NodeCast::from(&doc_body)).is_ok());
         }
 
         // Step 8.