@code_warntype infers DArray as Any

General Usage
1

Why does my function show this warning on the type of output DArray?

addprocs(4)
using DistributedArrays

function myfill(v::Int)
      D = DArray((nworkers(),), workers()) do I
           [v]
     end
     return D
end

So far so good

julia> myfill(3)
4-element DistributedArrays.DArray{Int64,1,Array{Int64,1}}:
3
3
3
3

as expected. But when I do
@code_warntype myfill(3)
I get

Variables:
#self#
v::Int64
#1::##1#2{Int64}
D::Any
n::Int64
#temp#::Int64

Why is D now inferred as Any (on Julia 0.6.2) ?