Imported Upstream version 4.8.0.309

Former-commit-id: 5f9c6ae75f295e057a7d2971f3a6df4656fa8850

mcs/tests/gtest-638.cs

@@ -0,0 +1,17 @@
+class X<T1, T2, U>
+	where T1 : class, T2
+	where T2 : class
+	where U : A, T1
+{
+}
+
+class A
+{
+}
+
+class F
+{
+	public static void Main ()
+	{
+	}
+}