Replace Root::deref by a custom get_unsound_ref_forever method.

This will hopefully make it clearer that this is not the correct function
to call.

1 files changed, 11 insertions, 7 deletions

diff --git a/components/script/dom/bindings/js.rs b/components/script/dom/bindings/js.rs
index 02a6c430421..8b8f19e4d97 100644
--- a/components/script/dom/bindings/js.rs
+++ b/components/script/dom/bindings/js.rs
@@ -614,6 +614,17 @@ impl<T: Reflectable> Root<T> {
             chain: ContravariantLifetime,
         }
     }
+
+    /// Obtain an unsafe reference to the wrapped JS owned-value that can
+    /// outlive the lifetime of this root.
+    ///
+    /// DO NOT CALL.
+    pub fn get_unsound_ref_forever<'b>(&self) -> JSRef<'b, T> {
+        JSRef {
+            ptr: self.jsref.ptr,
+            chain: ContravariantLifetime,
+        }
+    }
 }
 
 #[unsafe_destructor]
@@ -623,13 +634,6 @@ impl<T: Reflectable> Drop for Root<T> {
     }
 }
 
-impl<'b, T: Reflectable> Deref for Root<T> {
-    type Target = JSRef<'b, T>;
-    fn deref<'c>(&'c self) -> &'c JSRef<'b, T> {
-        &self.jsref
-    }
-}
-
 impl<'a, T: Reflectable> Deref for JSRef<'a, T> {
     type Target = T;
     fn deref<'b>(&'b self) -> &'b T {