Introduce `flatten`, which removes the need for `flattened_list`. Use it in `toplevel_phrase`.
Introduce `flatten`, which removes the need for `flattened_list`.
Use it in `toplevel_phrase`.

gerdstolpmann/ocaml,gerdstolpmann/ocaml,gerdstolpmann/ocaml,gerdstolpmann/ocaml,gerdstolpmann/ocaml