Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/tests/gtest-609.cs

@@ -0,0 +1,18 @@
+class X<T, TBase> where T : TBase
+{
+	static TBase tb;
+
+	public static void X2<T2> (T2 arg) where T2 : T
+	{
+		tb = arg;
+		tb = (T2)tb;
+	}
+}
+
+class Z
+{
+	public static void Main ()
+	{
+		X<string, object>.X2 ("");
+	}
+}