If it's an internal (unexpected) error, panic. You get a backtrace and everything--which helps because it was an unexpected internal error, so you probably mess

If it's an internal (unexpected) error, panic. You get a backtrace and everything--which helps because it was an unexpected internal error, so you probably messed up. You'd like to know where that is. But if it's an actual user-visible error code then that means you expected for this error to happen eventually and you designed for it. Why then do you need a backtrace? You program is doing what it's supposed to. I mean sure while developing it's nice to be able to just replace the error code emission by panic (which I do sometimes)--but in regular operation? It doesn't help the user at all.