Trouble initializing a templated class

[quakkels via Digitalmars-d-learn]

I'm going through Adam Wilson's talk 'C# to D' and I've gotten 
hung up by one of his examples regarding generic programming in 
D. Specifically, I'm trying to implement the code example found 
here: http://youtu.be/6_xdfSVRrKo?t=16m44s.

I created a templateExp.d file that looks like this:
        public class BaseClass {}
        public class OtherClass : BaseClass {}

        class SomeClass(T : BaseClass)
        {
                public T[] values;
                public void add(T input) { values ~= input; }
        }

        void main()
        {
                auto sc = new SomeClass();
                OtherClass oc1 = new OtherClass();
                OtherClass oc2 = new OtherClass();

                sc.add(oc1);
                sc.add(oc2);

                import std.stdio;
                writefln("value count", sc.values.length);
        }

When I run the dmd compiler, I get this error:

        >dmd templateExp.d
	teamplteExp.d(12): Error: class teamplteExp.SomeClass(T : 
BaseClass) is used as a type

How can I initialize this class correctly?