using System;
using System.IO;
using System.Collections.Generic;

class C
{
	static int Test<T> () where T : Exception
	{
		try {
			throw null;
		} catch (T t) when (t.Message != null) {
			return 0;
		}
	}
 
	static int Main()
	{
		try {
			Test<ApplicationException> ();
			return 1;
		} catch {
		}

		if (Test<NullReferenceException> () != 0)
			return 2;

		return 0;
	}
}