Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/tests/gtest-555.cs

@@ -0,0 +1,21 @@
+using System;
+
+struct Program
+{
+	static int Test<T> (T o)
+	{
+		return o is Program? ? 1 : 2;
+	}
+	
+	public static int Main ()
+	{
+		if (Test (5) != 2)
+			return 1;
+		
+		Program? a = new Program ();
+		if (Test (a) != 1)
+			return 2;
+		
+		return 0;
+	}
+}