Imported Upstream version 3.8.0

Former-commit-id: 6a76a29bd07d86e57c6c8da45c65ed5447d38a61

mcs/errors/cs8031.cs

@@ -0,0 +1,17 @@
+// CS8031: Async lambda expression or anonymous method converted to a `Task' cannot return a value. Consider returning `Task<T>'
+// Line: 12
+
+using System;
+using System.Threading.Tasks;
+
+class Test
+{
+	public static void Main()
+	{
+		Func<Task> t = async delegate {
+			return null;
+		};
+
+		return;
+	}
+}