--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/langtools/tools/javac/DuplicateClass.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,21 @@
+/*
+ * @test /nodynamiccopyright/
+ * @bug 4531500
+ * @summary Cascade of problems from duplicate class can cause compiler crash.
+ * @author gafter
+ *
+ * @compile/fail/ref=DuplicateClass.out -XDrawDiagnostics DuplicateClass.java
+ */
+
+/**
+ * Compiling this translation unit should fail; there is, after all, a
+ * duplicate class.  Nonetheless, the compiler should not crash while
+ * processing it.
+ */
+public class DuplicateClass {
+    protected Object clone() {
+        super.clone();
+    }
+}
+
+public class DuplicateClass {}