Why "expected attribute" compile error w/slot?

I’m sure this is super obvious but I’m struggling to follow along with the Liveview documentation regarding slots. The setup below generates “expected attribute” compile error and I don’t understand why. Just ramping up the learning curve with slots so appreciate any help. See image below for recap. thanks.

The closing tag for slot_test in your render function should be </.slot_test>, not <./slot_test>. Don’t know for sure if that’s going to fix your problem if there’s something else going on, but it stood out to me

Edit: I did a quick test and can confirm that that syntax mistake will produce an expected attribute name error message