Ah, so as long as optimize is 2 or less you should get tail call recursion. I found when I tried it (several years ago) the default was debug optimize. I wonde

Ah, so as long as optimize is 2 or less you should get tail call recursion. I found when I tried it (several years ago) the default was debug optimize. I wonder if different installs (or perhaps it's Slime) sets this value to different levels. Something to bear in mind anyway..