Auto merge of #24888 - tamird:snapshot, r=alexcrichton

r? @alexcrichton cc @brson

src/libcoretest/lib.rs

@@ -13,7 +13,6 @@
 
 #![feature(box_syntax)]
 #![feature(unboxed_closures)]
-#![feature(unsafe_destructor)]
 #![feature(core)]
 #![feature(test)]
 #![feature(rand)]

src/libcoretest/option.rs

@@ -44,8 +44,7 @@ fn test_get_resource() {
        i: Rc<RefCell<isize>>,
     }
 
-    #[unsafe_destructor]
-    impl Drop for R {
+        impl Drop for R {
        fn drop(&mut self) {
             let ii = &*self.i;
             let i = *ii.borrow();