Why limit your changes to syntax? Intercal's COME FROM would be a good addition, but you definitely also need SOLVE and PROVE statements to increase the power o

Why limit your changes to syntax? Intercal's COME FROM would be a good addition, but you definitely also need SOLVE and PROVE statements to increase the power of the language. Having IF TERMINATES and IF NOT TERMINATES predicates would be useful, too. Why limit yourself to everyday computable functions? And if you really wanted to, you could implement both SOLVE and PROVE in terms of them...