Cyclic module usage error

Hi all, I have the following simple snippet but I got cyclic module usage error. Do you know how should I resolve the error?

defmodule Cycle do
  alias Cycle.Handle

  def hello(%Handle{resource: _resource}) do
    :world
  end

  defmodule Handle do
    defstruct resource: nil, reference: nil

    def wrap_resource(resource) do
      %__MODULE__{
        resource: resource,
        reference: make_ref()
      }
    end
  end
end

The error is:

== Compilation error in file lib/cycle.ex ==
** (CompileError) lib/cycle.ex:16: Cycle.Handle.__struct__/0 is undefined, cannot expand struct Cycle.Handle. Make sure the struct name is correct. If the struct name exists and is correct but it still cannot be found, you likely have cyclic module usage in your code
    lib/cycle.ex:16: (module)