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);
	}