diff -r 18e0269f25e3 -r 8ec37cf2b37e test/tools/javac/api/6852595/T6852595.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/tools/javac/api/6852595/T6852595.java	Wed Jun 24 10:50:54 2009 +0100
@@ -0,0 +1,66 @@
+/*
+ * Copyright 2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/*
+ * @test
+ * @bug     6852595
+ * @summary Accessing scope using JSR199 API on erroneous tree causes Illegal Argument Exception
+ * @author  mcimadamore
+ */
+
+import java.io.IOException;
+import java.net.URI;
+import java.util.Arrays;
+import java.util.List;
+import javax.tools.JavaCompiler;
+import javax.tools.JavaFileObject;
+import javax.tools.SimpleJavaFileObject;
+import javax.tools.ToolProvider;
+
+import com.sun.source.util.JavacTask;
+import com.sun.source.tree.*;
+import com.sun.source.util.TreePath;
+import com.sun.source.util.Trees;
+import com.sun.tools.javac.api.JavacTrees;
+import com.sun.tools.javac.tree.JCTree.*;
+
+import static javax.tools.JavaFileObject.Kind;
+
+public class T6852595 {
+    public static void main(String[] args) throws IOException {
+        JavaFileObject sfo = new SimpleJavaFileObject(URI.create("myfo:/Test.java"),Kind.SOURCE) {
+            public CharSequence getCharContent(boolean ignoreEncodingErrors) {
+                return "class BadName { Object o = j; }";
+            }
+        };
+        List<? extends JavaFileObject> files = Arrays.asList(sfo);
+        JavaCompiler tool = ToolProvider.getSystemJavaCompiler();
+        JavacTask ct = (JavacTask)tool.getTask(null, null, null, null, null, files);
+        Iterable<? extends CompilationUnitTree> compUnits = ct.parse();
+        CompilationUnitTree cu = compUnits.iterator().next();
+        ClassTree cdef = (ClassTree)cu.getTypeDecls().get(0);
+        JCVariableDecl vdef = (JCVariableDecl)cdef.getMembers().get(0);
+        TreePath path = TreePath.getPath(cu, vdef.init);
+        Trees.instance(ct).getScope(path);
+    }
+}