Do you mean the ‘register’ keyword?

My root-cause analysis:

I was visualizing Scala method definitions and associated the language's type inference with keyword use, thus bringing C++'s "auto" keyword to mind when the long-since deprecated "register" keyword was the correct subject.

It would appear LLM's are not the only entities which can "hallucinate" a response. :-D

> Do you mean the ‘register’ keyword?

Yes I did, my bad.