Memory error when using a template in a class destructor

[JC via Digitalmars-d-learn]

The following code throws a 
core.exception.InvalidMemoryOperationError@(0), anyone have an 
idea of what is causing it?

---
import std.stdio;

class Test
{
        this()
        {
                struct Start
                {
                        string filename;
                }
                Message!(Start)(Start("one.txt"));
        }

        ~this()
        {
                struct Stop
                {
                        string filename;
                }
                Message!(Stop)(Stop("one.txt"));
        }
}

unittest
{
        auto t = new Test();
}

struct Message(T)
{
        this(T message)
        {
                writeln(typeid(T));
                writeln(message);
        }