julia> start_=reinterpret(Ptr{Nothing},10); stop_=reinterpret(Ptr{Nothing},20); step_=2%UInt;

julia> collect(start_:step_:stop_)
6-element Array{Ptr{Nothing},1}:
 Ptr{Nothing} @0x000000000000000a
 Ptr{Nothing} @0x000000000000000c
 Ptr{Nothing} @0x000000000000000e
 Ptr{Nothing} @0x0000000000000010
 Ptr{Nothing} @0x0000000000000012
 Ptr{Nothing} @0x0000000000000014

julia> collect(reverse(start_:step_:stop_))

signal (11): Segmentation fault