Imported Upstream version 3.8.0

Former-commit-id: 6a76a29bd07d86e57c6c8da45c65ed5447d38a61

mcs/tests/test-async-64.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Threading.Tasks;
+
+class X
+{
+	public static void Main ()
+	{
+		Invoke (async delegate {
+			await Task.Yield ();
+			return 1;
+		});
+	}
+
+	static T Invoke<T> (Func<Task<T>> m)
+	{
+		return default (T);
+	}
+}