I believe he’s referring to (::fooFunction)
vs. { it.fooFunction() }
To be fair, he was just clarifying a comment he made (“Kotlin has more warts than Java,” to paraphrase) specifically because I asked him to. And I asked him to because as much as I love Kotlin, I don’t want to be one of those people who drink the Kool-aid. I want to hear concerns from people more critical than me, because they might be right. At the very least, I can evaluate whether those concerns are valid and relevant for me.