it's slow, but i think it's happening. co-routines are starting to become popular 35 years after icon had something similar. that could be seen as step on the

it's slow, but i think it's happening. co-routines are starting to become popular 35 years after icon had something similar. that could be seen as step on the road to integrated search (which needs some kind of idea of sequences of results). [incidentally, i wrote a recursive descent combinator lib that worked on generic sequences, in python. afaik no-one ever used it for anything but strings. not even for parsing binary data in comms protocols. i extended it to a regexp engine; it was hopelessly slow. one reason regexps work so well is that they're so efficiently implemented on simple sequences of bytes. the overhead of "irregular" sequences is quite something - perhaps jits will help here (although pypy didn't help me)...]