--- old/src/share/classes/java/lang/AutoCloseable.java	2013-02-05 13:59:13.000000000 -0800
+++ new/src/share/classes/java/lang/AutoCloseable.java	2013-02-05 13:59:12.000000000 -0800
@@ -31,6 +31,7 @@
  * @author Josh Bloch
  * @since 1.7
  */
+@FunctionalInterface
 public interface AutoCloseable {
     /**
      * Closes this resource, relinquishing any underlying resources.