diff --git a/build.rs b/build.rs
index 7aeeda913..9925e2d07 100644
--- a/build.rs
+++ b/build.rs
@@ -1,5 +1,3 @@
-#![feature(convert)]
-
 extern crate gl_generator;
 extern crate khronos_api;
 
diff --git a/examples-disabled/fullscreen.rs b/examples-disabled/fullscreen.rs
index 37ea36692..3b9e2c1e2 100644
--- a/examples-disabled/fullscreen.rs
+++ b/examples-disabled/fullscreen.rs
@@ -1,5 +1,3 @@
-#![feature(std_misc)]
-
 #[cfg(target_os = "android")]
 #[macro_use]
 extern crate android_glue;
diff --git a/examples/cursor.rs b/examples/cursor.rs
index c5bcbd6e1..0dced66d3 100644
--- a/examples/cursor.rs
+++ b/examples/cursor.rs
@@ -1,5 +1,3 @@
-#![feature(std_misc)]
-
 #[cfg(target_os = "android")]
 #[macro_use]
 extern crate android_glue;
diff --git a/examples/grabbing.rs b/examples/grabbing.rs
index 80887744d..8a4675095 100644
--- a/examples/grabbing.rs
+++ b/examples/grabbing.rs
@@ -1,5 +1,3 @@
-#![feature(std_misc)]
-
 #[cfg(target_os = "android")]
 #[macro_use]
 extern crate android_glue;
diff --git a/examples/multiwindow.rs b/examples/multiwindow.rs
index 92565552c..ce97266c1 100644
--- a/examples/multiwindow.rs
+++ b/examples/multiwindow.rs
@@ -1,5 +1,3 @@
-#![feature(std_misc)]
-
 #[cfg(target_os = "android")]
 #[macro_use]
 extern crate android_glue;
diff --git a/examples/vsync.rs b/examples/vsync.rs
index 768bfc087..ec9ea79f6 100644
--- a/examples/vsync.rs
+++ b/examples/vsync.rs
@@ -1,5 +1,3 @@
-#![feature(std_misc)]
-
 #[cfg(target_os = "android")]
 #[macro_use]
 extern crate android_glue;
diff --git a/examples/window.rs b/examples/window.rs
index 0e2a3cf80..1d3b6158f 100644
--- a/examples/window.rs
+++ b/examples/window.rs
@@ -1,5 +1,3 @@
-#![feature(std_misc)]
-
 #[cfg(target_os = "android")]
 #[macro_use]
 extern crate android_glue;
diff --git a/src/cocoa/mod.rs b/src/cocoa/mod.rs
index e756aba33..ca9d888b6 100644
--- a/src/cocoa/mod.rs
+++ b/src/cocoa/mod.rs
@@ -719,15 +719,5 @@ impl Clone for IdRef {
         }
         IdRef(self.0)
     }
-
-    fn clone_from(&mut self, source: &IdRef) {
-        if source.0 != nil {
-            let _: id = unsafe { msg_send![source.0, retain] };
-        }
-        if self.0 != nil {
-            let _: () = unsafe { msg_send![self.0, release] };
-        }
-        self.0 = source.0;
-    }
 }