>> For toy projects it's amazing: you get good error messages with 0 effort.
> What about non-toy projects? Are there times where the automatic error
> recovery mechanism gets in the way?

I wouldn't know, really.
SML/NJ uses it and I find its syntax error reporting to be generally good.
E.g. significantly better than OCaml's ;-)

But if it's not good enough, there are hooks to influence its behavior
(e.g. telling it what to try and add/remove first, thus telling it basically
what are tokens commonly forgotten and spuriously added), but I don't know
how it compares in practice to a well tuned yacc error recovery.


        Stefan