alt Hacker News> still doesn't do even basic Pascal enumerations
The term you are looking for is sum types (albeit in a gimped form in the case of Pascal). Enumerations refer to the value applied to the type, quite literally, and is identical in Pascal as every other language with enumerations, including Go. There is only so much you can do with what is little more than a counter.
I'm fairly sure he's referring to enumerations actually.
Pascal doesn't require case matching of enumerations to be exhaustive, but this can be turned on as a compiler warning in modern Pascal environments, FreePascal / Lazarus and such.
Go only has enums by convention, hence the "iota dance" referred to. I've argued before that this does qualify as "having enums" but just barely.
It wouldn't have been difficult to do a much better job of it, is the thing.