Something weird with threads.

[Trass3r]

>   - Error: template std.concurrency.spawn(T...) cannot deduce
> template function from argument types !()(void delegate())

As the message already tells a class method yields a delegate and not a  
function.
Check if that method could be made static.
But if you really need to do it this way, you may create a static wrapper  
function that calls the method on a particular class instance. You should  
be able to use a function literal as well.