--- old/src/jdk/nashorn/internal/runtime/arrays/ByteBufferArrayData.java	2017-01-11 17:11:05.000000000 +0100
+++ new/src/jdk/nashorn/internal/runtime/arrays/ByteBufferArrayData.java	2017-01-11 17:11:05.000000000 +0100
@@ -82,7 +82,7 @@
     }
 
     @Override
-    public void shiftLeft(final int by) {
+    public ArrayData shiftLeft(final int by) {
         throw unsupported("shiftLeft");
     }