Looking for ideas to improve library API

[Chris Lalancette]

On Thu, Nov 26, 2015 at 7:46 AM, Devin Jeanpierre
<jeanpierreda at gmail.com> wrote:
> Why not take ownership of the file object, instead of requiring users
> to manage lifetimes?

Yeah, I've kind of been coming to this conclusion.  So my question
then becomes: how do I "take ownership" of it?  I already keep a
reference to it, but how would I signal to the API user that they
should no longer use that file object (other than documentation)?

Thanks,
Chris