+extern const char *hook_constcharptr_const_tree_null (const_tree);
+extern const char *hook_constcharptr_const_rtx_null (const_rtx);
+extern const char *hook_constcharptr_const_tree_const_tree_null (const_tree, const_tree);
+extern const char *hook_constcharptr_int_const_tree_null (int, const_tree);
+extern const char *hook_constcharptr_int_const_tree_const_tree_null (int, const_tree, const_tree);