@type input() :: %{
  optional(:start) =>
    Vize.SourceLocation.input() | Vize.SourceLocation.t() | nil,
  optional(:end) => Vize.SourceLocation.input() | Vize.SourceLocation.t() | nil,
  optional(:source) => String.t() | nil
}

@type t() :: %Vize.SourceRange{
  end: Vize.SourceLocation.t() | nil,
  source: String.t() | nil,
  start: Vize.SourceLocation.t() | nil
}