obsolete cleanup

com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/unary/CastListNode.java

@@ -27,7 +27,6 @@ import com.oracle.truffle.api.dsl.ImportStatic;
 import com.oracle.truffle.api.dsl.Specialization;
 import com.oracle.truffle.api.interop.TruffleObject;
 import com.oracle.truffle.api.profiles.ValueProfile;
-import com.oracle.truffle.r.nodes.attributes.SpecialAttributesFunctions.SetClassAttributeNode;
 import com.oracle.truffle.r.runtime.RRuntime;
 import com.oracle.truffle.r.runtime.RType;
 import com.oracle.truffle.r.runtime.data.RFunction;
@@ -44,8 +43,6 @@ import com.oracle.truffle.r.runtime.interop.ForeignArray2R;
 @ImportStatic(RRuntime.class)
 public abstract class CastListNode extends CastBaseNode {
 
-    @Child private SetClassAttributeNode setClassAttrNode;
-
     public abstract RList executeList(Object o);
 
     protected CastListNode(boolean preserveNames, boolean preserveDimensions, boolean preserveAttributes) {