Robbert, I updated extra/visitor and moved it to the new module system. It doesn't have that problem you mentioned anymore, as long as you give it a stack comment. (Really, there's still a bug, because you shouldn't *need* a comment because there's no recursion, so it should all be inferrable. But comments are good.) I also updated visitor to have an 80% working see method, which shows how things are actually implemented (but it does the declaration wrong, showing GENERIC: instead of VISITOR:). extra/memoize has a see method too. It's all in my repos at littledan.onigirihouse.com/repos
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