Go showing basic panic recover

panic_recover.go

func CaculateSomething(i int) (result int, err error) {
  // Does a bunch of math to calculate a value, or
  // returns an error when it can't.
  defer func() {
    if r := recover(); r != nil {
      err = fmt.Errorf("panic: %+v", r)
    }
  }()
  // ... the magic ...
  return result, err
}