Error in chp4

[lafith]

Under the section 'Type inference and empty collections' It is mentioned that 'Julia has a dedicated type, None – a subtype of Any – that applies to the empty set'. But following is the output I am getting in REPL:

	julia> empty_set = []
       Any[]

instead of:

	julia> empty_set = []
	0-element Array{None,1}