--- old/src/jdk/nashorn/internal/runtime/arrays/ArrayFilter.java	2017-01-11 17:11:04.000000000 +0100
+++ new/src/jdk/nashorn/internal/runtime/arrays/ArrayFilter.java	2017-01-11 17:11:04.000000000 +0100
@@ -68,9 +68,10 @@
     }
 
     @Override
-    public void shiftLeft(final int by) {
+    public ArrayData shiftLeft(final int by) {
         underlying.shiftLeft(by);
         setLength(underlying.length());
+        return this;
     }
 
     @Override