-extern void dump_stmt (dump_info_p, tree);
-extern void queue_and_dump_index (dump_info_p, const char *, tree, int);
-extern void queue_and_dump_type (dump_info_p, tree);
-extern void dump_function (enum tree_dump_index, tree);
+extern void dump_stmt (dump_info_p, const_tree);
+extern void queue_and_dump_index (dump_info_p, const char *, const_tree, int);
+extern void queue_and_dump_type (dump_info_p, const_tree);
+extern void dump_function (int, tree);