slp_twalk
slp_twalk(collator, collect_attrs, 0, &answer);
slp_twalk(collator, collect_types, 0, (void *) &types);
slp_twalk(collator, process_surl_node, 0, caller);
slp_twalk(stree, collect_scopes, 0, (void *) ppcScopes);
extern void slp_twalk(void *, void (*)(void *, VISIT, int, void *),
slp_twalk(da_cache, free_cache_entry, 0, NULL);
slp_twalk(collator, free_pr_node, 0, NULL);
slp_twalk(root->llink, action, level + 1, cookie);
slp_twalk(root->rlink, action, level + 1, cookie);