Interesting paper.

When I look at the outputs, I think "this looks like a very simple homework assignment". If they had provided sample input, as well as sample output, I'd be able to test my belief. I imagine I can produce functionally-equivalent Python code in a few hours (note: Python was not a reasonable option in 1993).

In any case, this is a test in prototyping, with guidance of "5 person-days of effort"), so you would certainly expect languages like C++ and Ada to fail spectacularly.