[m-rev.] diff: private_builtin should not import io, step 3

[Julien Fischer]

On Thu, 11 Dec 2014, Zoltan Somogyi wrote:

> I committed step 2 earlier today. Please tell me when you have
> installed that step, so I can commit this one.

I have installed step 2 and it is available in rotd-2014-12-12.

Cheers,
Julien.