diff -r 000000000000 -r 959103a6100f test/tools/javac/cast/6665356/T6665356.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/tools/javac/cast/6665356/T6665356.java	Wed Apr 27 01:34:52 2016 +0800
@@ -0,0 +1,57 @@
+/*
+ * @test /nodynamiccopyright/
+ * @author Maurizio Cimadamore
+ * @bug     6665356
+ * @summary Cast not allowed when both qualifying type and inner class are parameterized
+ * @compile/fail/ref=T6665356.out -XDrawDiagnostics T6665356.java
+ */
+
+class T6665356 {
+    class Outer<S> {
+        class Inner<T> {}
+    }
+
+    void cast1(Outer<Integer>.Inner<Long> p) {
+        Object o = (Outer<Integer>.Inner<Long>)p;
+    }
+
+    void cast2(Outer<Integer>.Inner<Long> p) {
+        Object o = (Outer<? extends Number>.Inner<Long>)p;
+    }
+
+    void cast3(Outer<Integer>.Inner<Long> p) {
+        Object o = (Outer<Integer>.Inner<? extends Number>)p;
+    }
+
+    void cast4(Outer<Integer>.Inner<Long> p) {
+        Object o = (Outer<? extends Number>.Inner<? extends Number>)p;
+    }
+
+    void cast5(Outer<Integer>.Inner<Long> p) {
+        Object o = (Outer<? super Number>.Inner<Long>)p;
+    }
+
+    void cast6(Outer<Integer>.Inner<Long> p) {
+        Object o = (Outer<Integer>.Inner<? super Number>)p;
+    }
+
+    void cast7(Outer<Integer>.Inner<Long> p) {
+        Object o = (Outer<? super Number>.Inner<? super Number>)p;
+    }
+
+    void cast8(Outer<Integer>.Inner<Long> p) {
+        Object o = (Outer<? extends String>.Inner<Long>)p;
+    }
+
+    void cast9(Outer<Integer>.Inner<Long> p) {
+        Object o = (Outer<Integer>.Inner<? extends String>)p;
+    }
+
+    void cast10(Outer<Integer>.Inner<Long> p) {
+        Object o = (Outer<? super String>.Inner<Long>)p;
+    }
+
+    void cast11(Outer<Integer>.Inner<Long> p) {
+        Object o = (Outer<Integer>.Inner<? super String>)p;
+    }
+}