--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.util/src/org/graalvm/util/EconomicSet.java	Fri Feb 02 10:37:48 2018 -0500
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,126 +0,0 @@
-/*
- * Copyright (c) 2017, 2017, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-package org.graalvm.util;
-
-import java.util.Iterator;
-
-import org.graalvm.util.impl.EconomicMapImpl;
-
-/**
- * Memory efficient set data structure.
- */
-public interface EconomicSet<E> extends UnmodifiableEconomicSet<E> {
-
-    boolean add(E element);
-
-    void remove(E element);
-
-    void clear();
-
-    default void addAll(EconomicSet<E> values) {
-        addAll(values.iterator());
-    }
-
-    default void addAll(Iterable<E> values) {
-        addAll(values.iterator());
-    }
-
-    default void addAll(Iterator<E> values) {
-        while (values.hasNext()) {
-            add(values.next());
-        }
-    }
-
-    default void removeAll(EconomicSet<E> values) {
-        removeAll(values.iterator());
-    }
-
-    default void removeAll(Iterable<E> values) {
-        removeAll(values.iterator());
-    }
-
-    default void removeAll(Iterator<E> values) {
-        while (values.hasNext()) {
-            remove(values.next());
-        }
-    }
-
-    default void retainAll(EconomicSet<E> values) {
-        Iterator<E> iterator = iterator();
-        while (iterator.hasNext()) {
-            E key = iterator.next();
-            if (!values.contains(key)) {
-                iterator.remove();
-            }
-        }
-    }
-
-    /**
-     * Creates a new set guaranteeing insertion order when iterating over its elements with the
-     * default {@link Equivalence#DEFAULT} comparison strategy.
-     */
-    static <E> EconomicSet<E> create() {
-        return EconomicSet.create(Equivalence.DEFAULT);
-    }
-
-    /**
-     * Creates a new set guaranteeing insertion order when iterating over its elements.
-     */
-    static <E> EconomicSet<E> create(Equivalence strategy) {
-        return EconomicMapImpl.create(strategy);
-    }
-
-    /**
-     * Creates a new set guaranteeing insertion order when iterating over its elements with the
-     * default {@link Equivalence#DEFAULT} comparison strategy and inserts all elements of the
-     * specified collection.
-     */
-    static <E> EconomicSet<E> create(int initialCapacity) {
-        return EconomicSet.create(Equivalence.DEFAULT, initialCapacity);
-    }
-
-    /**
-     * Creates a new set guaranteeing insertion order when iterating over its elements with the
-     * default {@link Equivalence#DEFAULT} comparison strategy and inserts all elements of the
-     * specified collection.
-     */
-    static <E> EconomicSet<E> create(UnmodifiableEconomicSet<E> c) {
-        return EconomicSet.create(Equivalence.DEFAULT, c);
-    }
-
-    /**
-     * Creates a new set guaranteeing insertion order when iterating over its elements and
-     * initializes with the given capacity.
-     */
-    static <E> EconomicSet<E> create(Equivalence strategy, int initialCapacity) {
-        return EconomicMapImpl.create(strategy, initialCapacity);
-    }
-
-    /**
-     * Creates a new set guaranteeing insertion order when iterating over its elements and inserts
-     * all elements of the specified collection.
-     */
-    static <E> EconomicSet<E> create(Equivalence strategy, UnmodifiableEconomicSet<E> c) {
-        return EconomicMapImpl.create(strategy, c);
-    }
-}