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src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/arrays/UndefinedArrayFilter.java

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@@ -75,13 +75,14 @@
 
         return value;
     }
 
     @Override
-    public void shiftLeft(final int by) {
+    public ArrayData shiftLeft(final int by) {
         super.shiftLeft(by);
         undefined.shiftLeft(by, length());
+        return this;
     }
 
     @Override
     public ArrayData shiftRight(final int by) {
         super.shiftRight(by);
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