sending an Exception and print it

[Dan Killebrew]

I just wanted to add that the "can't format immutable Exception" 
also prevents me from doing this:
   auto exception = receiveOnly!(immutable Exception)();
because receiveOnly creates a tuple which implements a toString 
that uses indirectly uses formatObject. So I'm forced to use the 
slightly more clunky recieve() as seen on DPaste.