--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api.dsl.test/src/com/oracle/truffle/api/dsl/test/processor/TruffleProcessorTest.java	Tue May 19 12:30:51 2015 +0200
@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2014, 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 com.oracle.truffle.api.dsl.test.processor;
+
+import com.oracle.truffle.dsl.processor.verify.VerifyTruffleProcessor;
+import java.util.Locale;
+import java.util.ServiceLoader;
+import javax.annotation.processing.Processor;
+import javax.tools.Diagnostic;
+import javax.tools.JavaFileObject;
+import static org.junit.Assert.*;
+import org.junit.Test;
+
+/**
+ * Verify errors emitted by the processor.
+ *
+ * @author Jaroslav Tulach
+ */
+public class TruffleProcessorTest {
+    @Test
+    public void childCannotBeFinal() throws Exception {
+        // @formatter:off
+        String code = "package x.y.z;\n" +
+            "import com.oracle.truffle.api.nodes.Node;\n" +
+            "abstract class MyNode extends Node {\n" +
+            "  @Child final MyNode first;\n" +
+            "  MyNode(MyNode n) {\n" +
+            "    this.first = n;\n" +
+            "  };\n" +
+            "}\n";
+        // @formatter:on
+
+        Compile c = Compile.create(VerifyTruffleProcessor.class, code);
+        c.assertErrors();
+        boolean ok = false;
+        StringBuilder msgs = new StringBuilder();
+        for (Diagnostic<? extends JavaFileObject> e : c.getErrors()) {
+            String msg = e.getMessage(Locale.ENGLISH);
+            if (msg.contains("cannot be final")) {
+                ok = true;
+            }
+            msgs.append("\n").append(msg);
+        }
+        if (!ok) {
+            fail("Should contain warning about final:" + msgs);
+        }
+    }
+
+    @Test
+    public void workAroundCannonicalDependency() throws Exception {
+        Class<?> myProc = VerifyTruffleProcessor.class;
+        assertNotNull(myProc);
+        StringBuilder sb = new StringBuilder();
+        sb.append("Cannot find ").append(myProc);
+        for (Processor load : ServiceLoader.load(Processor.class)) {
+            sb.append("Found ").append(load);
+            if (myProc.isInstance(load)) {
+                return;
+            }
+        }
+        fail(sb.toString());
+    }
+}