pass-by-ref semantics for structs (was Deque impl.)

[monarch_dodra]

Whilst we're talking about containers and refcounted, I've been 
encountering on and off a very strange bug with Array and 
RefCounted.

It is creating stack overflows, and I'm *certain* is creating 
problems when trying to nest connectors. I also think it is the 
"tip" of a more serious bug.

Could anybody with the required skills try to investigate this 
one?

http://d.puremagic.com/issues/show_bug.cgi?id=9438