Threads not garbage collected ?

[Chris Wright via Digitalmars-d]

The thread you created holds a reference to the `class A` object, so that 
object can't be collected.

This is what you probably want. As soon as the object is collected, its 
memory can be reused. But the thread still has a reference to it, so it 
can modify and read that memory. And whoever the GC handed that memory can 
modify and read it. In short, data corruption.