diff -r 000000000000 -r 959103a6100f test/tools/javac/6521805/T6521805d.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/tools/javac/6521805/T6521805d.java	Wed Apr 27 01:34:52 2016 +0800
@@ -0,0 +1,27 @@
+/*
+ * @test /nodynamiccopyright/
+ * @bug 6521805
+ * @summary Regression: JDK5/JDK6 javac allows write access to outer class reference
+ * @author mcimadamore
+ *
+ * @compile/fail/ref=T6521805d.out T6521805d.java -XDrawDiagnostics
+ */
+
+class T6521805 {
+
+    static class Inner extends T6521805.Outer {
+
+        Inner(T6521805 t) {
+            t.super();
+        }
+
+        T6521805 this$0 = null;
+
+        public void foo() {
+            this$0 = new T6521805();
+        }
+    }
+
+    class Outer {}
+
+}