[danmg]

It leaks memory on every line it evaluates.

[MontyCarloHall]

I guess freeing all those pointers returned by ma() would be too verbose.

Seriously though, this must have been a deliberate design decision? Arthur Whitney is no amateur.

[avmich]

I'm sure memory management was left to deal with later. In Roger Hui variant, memory leaks were eliminated early on, on a systemic level.