“Deutsch: Yes, pure functional languages have a different set of problems, but they certainly cut through that Gordian knot. Every now and then I feel a temptation to design a programming language but then I just lie down until it goes away. But if I were to give in to that temptation, it would have a pretty fundamental cleavage between a functional part that talked only about values and had no concept of pointer and a different sphere of some kind that talked about patterns of sharing and reference and control.”