extern tree hide_evolution_in_other_loops_than_loop (tree, unsigned);
extern tree reset_evolution_in_loop (unsigned, tree, tree);
extern tree chrec_merge (tree, tree);
+extern void for_each_scev_op (tree *, bool (*) (tree *, void *), void *);
/* Observers. */
extern bool eq_evolutions_p (const_tree, const_tree);