diff -r 4ebc2e2fb97c -r 71c04702a3d5 src/jdk.jshell/share/classes/jdk/jshell/PersistentSnippet.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.jshell/share/classes/jdk/jshell/PersistentSnippet.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2015, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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 jdk.jshell;
+
+/**
+ * Grouping for Snippets which persist and influence future code.
+ * A persistent snippet can be
+ * {@linkplain jdk.jshell.Snippet.Status#OVERWRITTEN overwritten}
+ * with new input.
+ * <p>
+ * <code>PersistentSnippet</code> is immutable: an access to
+ * any of its methods will always return the same result.
+ * and thus is thread-safe.
+ *
+ * @since 9
+ */
+public abstract class PersistentSnippet extends Snippet {
+
+    PersistentSnippet(Key key, String userSource, Wrap guts, String unitName,
+            SubKind subkind, DiagList syntheticDiags) {
+        super(key, userSource, guts, unitName, subkind, syntheticDiags);
+    }
+
+    /**
+     * Name of the Snippet.
+     *
+     * @return the name of the snippet.
+     */
+    @Override
+    public String name() {
+        return unitName;
+    }
+}