Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/tests/test-async-60.cs

@@ -0,0 +1,42 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+class C : B
+{
+}
+
+class B
+{
+}
+
+class X
+{
+	public static void Main ()
+	{
+		var x = new X ();
+		x.AlignTwoItems ().Wait ();
+	}
+
+	public async Task AlignTwoItems ()
+	{
+		var items = new [] {
+			(C) await AddItemAt (20, 20),
+			(C) await AddItemAt (40, 40)
+		};
+		await MoveItemBy (items, 1, 1);
+
+		Console.WriteLine ((C) items [0]);
+		Console.WriteLine ((C) items [1]);
+	}
+
+	Task MoveItemBy (object o, int a, int b)
+	{
+		return Task.FromResult (2);
+	}
+
+	async Task<B> AddItemAt (int a, int b)
+	{
+		return new C ();
+	}
+}