Create a union type from a list

type_from_list.ex

# Converts a list of atoms into a typespec
type = &Enum.reduce(&1, fn x, acc -> {:|, [], [x, acc]} end)

@grammatical_gender [
  :animate,
  :inanimate,
  :personal,
  :common,
  :feminine,
  :masculine,
  :neuter
]

@type grammatical_gender :: unquote(type.(@grammatical_gender))