OutVarIssue.cs

class Program
    {
        public static void Main()
        {
            TimeSpan timeSpan;
            Foo foo;
            Bar bar;
            //Baz baz;

            TryTimeSpan(out timeSpan);
            TryFoo(out foo);
            TryBar(out bar);
            //TryBaz(out baz);

            Console.WriteLine(timeSpan);
            Console.WriteLine(foo);
            Console.WriteLine(bar);
        }

        private static bool TryTimeSpan(out TimeSpan timeSpan)
        {
            // no compile error!
            return false;
        }

        private static bool TryFoo(out Foo foo)
        {
            return false;
        }

        private static bool TryBar(out Bar bar)
        {
            return false;
        }

        /*
        private static bool TryBaz(out Baz baz)
        {
            // compile error, baz not assigned
            return false;
        }
        */
    }

    struct Foo { }

    struct Bar
    {
        public TimeSpan TimeSpan { get; set; }
    }

    struct Baz
    {
        public int Int { get; set; }
    }