How to split long function specs?

[Alex Jiao]

Let's say I have a very long function spec:

@callback handle_call(request :: term, state :: term) :: {:ok, reply, new_state} | {:ok, reply, new_state, :hibernate} | {:remove_handler, reply}

How do we split this?

[Andrea Leopardi]

I do this

@callback handle_call(request :: term, state :: term) ::
          {:ok, reply, new_state} |
          {:ok, reply, new_state, :hibernate} |
          {:remove_handler, reply}

[Alex Jiao]

Thanks @whatyouhide!

[Christopher Adams]

@lexmag Is this style rule for @callback, as well as @spec, deserving of mention in the guide? I'm sure it will keep coming up.