[infogulch]

Nil interfaces don't necessarily panic when their methods are called, just when nil variables are dereferenced. This is because the receiver is just another argument. For example, if `i` were this implementation of LoveGoer it wouldn't panic on a nil receiver:

    type JoeLovesGo struct{}

    func (jlg *JoeLovesGo) LoveGo() {
        fmt.Printf("Joe Loves Go! jlg is %v\n", jlg)
    }

( Playground: https://play.golang.org/p/kanq_mSmaI )

Now, if this (admittedly uncommon) use-case is worth it's downsides is a different question, but that's how it's set up now.