@type t() :: %Snakepit.PackageError{
  __exception__: true,
  message: String.t(),
  output: String.t() | nil,
  packages: [String.t()],
  suggestion: String.t() | nil,
  type: type()
}

@type type() ::
  :not_installed | :install_failed | :version_mismatch | :invalid_requirement