defmodule TestXain do
  defmacro content(do: block) do
    block =
      quote do
        _ = var!(conn)
        import Kernel, except: [div: 2, to_string: 1]
        use Xain

        markup safe: true do
          unquote(block)
        end
      end

    quote location: :keep do
      def page_view(var!(conn)), do: unquote(block)
    end
  end
end


defmodule TestXain.View do
  import TestXain

  content do
    IO.inspect(conn)
  end
end

iex(1)> TestXain.View.page_view(1)
1
{:safe, "1"}

This seems to work fine for me and circumvents the whole problem of unquote fragments.