Re: [PATCH] cex: fix leaks

Hey Akim,

> I also think changing the hash maps to bitset vectors is fine; I
> initially didn’t want to since I knew they could be pretty sparse.
>
> Then, instead of a bitsetv, a table of malloced bitsets should do it.  It
> might be sparse, but on a quite compact range, isn't it?
>

I realized this afternoon that it would probably be fine to put all of
these edges in the state-items themselves:

struct state_item
{
    ...
    struct state_item *transition;
    bitset productions;
    bitset revs;
};

The edges being in separate data structures is a holdover from the CUP
implementation, and I'm not sure if it makes sense to do this anymore.

~Vincent