Code crashing Julia

gistfile1.txt

adddame(a::Array{Array{Int}}, dame::Array{Int}) = push(copy(a), dame)

hitsany(dame::Array{Int}, dames::Array{Array{Int}}) = any(map((x) -> hits(dame, x), dames))
hits(a::Array{Int}, b::Array{Int}) = any(a == b) || abs(a-b)[1] == abs(a-b)[2]

function solve(x::Int, y::Int, n::Int, d::Array{Array{Int}})
  if n == 0
    return d
  end
  for px = 1:x
    for py = 1:y
      if !hitsany([px, py], d)
        s = solve(x, y, n-1, adddame(d, [px, py]))
        if s != None
          return s
        end
      end
    end
  end
  None
end

solve(x, y, n) = solve(x, y, n, Array(Array{Int}, 0))

for i = 1:10
  print("Solve for $i\n")
  print(solve(8, 8, i))
  print("\n")
end

This would make a nice addition to examples. Can you generate a pull request when ready?