--- a/langtools/src/jdk.jshell/share/classes/jdk/jshell/Wrap.java	Fri Dec 16 12:08:46 2016 +0100
+++ b/langtools/src/jdk.jshell/share/classes/jdk/jshell/Wrap.java	Fri Dec 16 15:27:34 2016 +0000
@@ -359,7 +359,7 @@
 
         @Override
         public String toString() {
-            return "CompoundWrap(" + Arrays.stream(os).map(u -> u.toString()).collect(joining(",")) + ")";
+            return "CompoundWrap(" + Arrays.stream(os).map(Object::toString).collect(joining(",")) + ")";
         }
     }