-/* Generic hook that takes a size_t and a pointer and returns false. */
-bool
-hook_bool_voidp_size_t_false (void * a ATTRIBUTE_UNUSED,
- size_t b ATTRIBUTE_UNUSED)
+/* Generic hook that takes a tree and returns a NULL string. */
+const char *
+hook_constcharptr_tree_null (tree t ATTRIBUTE_UNUSED)