Imported Upstream version 4.2.1.91

Former-commit-id: 5bd0f48812d39b3636887951adc772b94ef2f5af

mcs/tests/test-async-80.cs

@@ -0,0 +1,21 @@
+using System.Threading.Tasks;
+using System;
+
+class X
+{
+	public async Task Test<T, U> (int arg)
+	{
+		await Task.Run (async () => {
+					await Task.Run (async () => {
+						Console.WriteLine (this);
+					});
+				return arg;
+			}
+		);
+	}
+
+	public static void Main ()
+	{
+		new X().Test<int, long>(1).Wait ();
+	}
+}