Feature gate in test.

Author: withoutboats

src/test/compile-fail/object-safety-associated-consts.rs

@@ -11,6 +11,8 @@
 // Check that we correctly prevent users from making trait objects
 // from traits with associated consts.
 
+#![feature(associated_consts)]
+
 trait Bar {
     const X: usize;
 }