--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.util/src/org/graalvm/util/UnmodifiableEconomicMap.java	Fri Feb 02 10:37:48 2018 -0500
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,51 +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;
-
-/**
- * Unmodifiable memory efficient map data structure.
- */
-public interface UnmodifiableEconomicMap<K, V> {
-
-    V get(K key);
-
-    default V get(K key, V defaultValue) {
-        V v = get(key);
-        if (v == null) {
-            return defaultValue;
-        }
-        return v;
-    }
-
-    boolean containsKey(K key);
-
-    int size();
-
-    boolean isEmpty();
-
-    Iterable<V> getValues();
-
-    Iterable<K> getKeys();
-
-    UnmodifiableMapCursor<K, V> getEntries();
-}