[metapost] Recovering from errors in MPlib

[Nicola]

On 28/11/2016 14:30, Nicola wrote:
> Hi,
> when using MPlib, is it possible to recover from errors?
>
> In other words, when the current status of the MP instance is
> mp_error_message_issued, is it possible to return to a status
> where commands are accepted again? If so, how?
>
> I ask, because whatever command I send after an error,
> the status doesn't change. Maybe I'm doing something wrong.

I realize now that I have misinterpreted the meaning of
mp_history_state ("history" is there for a reason, I guess).
Sorry for the noise.

Nicola