The capstone doesn't handle errors well

[stellentus]

It puts the happy path inside an else. And every student I worked with had copied it and was putting code inside their else.
I told them to panic on errors, since I think that's best when everything is in main(), but I'm open to suggestions.

[grrtrr]

I personally would use log.Fatalf() since it avoids the long and ugly stack trace produced by panic (Prover b 3:).