Private type members in Scala aren't

I haven't posted in a while now, and one major reason is that I've been teaching a new course on Programming Languages.  I've been using Scala, somewhat experimentally, and as a (perhaps misguided) way of forcing myself to learn some Scala.

In the last few lectures, I've been covering Scala's object system.  I'm not an expert on Scala by any means, but I was a little surprised by the way "private" appears to work (or more accurately, not work) on type members of classes/objects.

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