What's the difference between panic("error_msg") and panic(error.New("error_msg")?

Question

Considering I'm using the original "errors" go package.

And, the difference between panic(11) and panic("11")?

Answer 1

panic is defined as func panic(v interface{}), calling panic(anything) will print the the string representation of anything then the stacktrace of the calling function.

Only difference is, if you use recover, you will be able to access whatever you passed to panic, for example:

func main() {
    defer func() {
        if err := recover(); err != nil {
            if n, ok := err.(int); ok && n == 11 {
                fmt.Println("got 11!")
            }
        }
    }()
    panic(11)
}

Answer 2

panic("error_msg") and panic("11") panic a string while panic(error.New("error_msg") panics an error and panic(11) panics an integer.

If you do not handle these panics with recover during defer than it won't matter which you use, all will print the "error_msg" or "11".