I used this in the early 1980s, on a VAX 11/780. It was one of the three languages of Poplog. The other two were Prolog and Lisp. Lisp would have been my

I used this in the early 1980s, on a VAX 11/780. It was one of the three languages of Poplog. The other two were Prolog and Lisp. Lisp would have been my preference, but at the time it lacked some important features. I notice Poplog now has Common Lisp, which wasn't available until later.