+/**
+ * The default merge_pair_func implementation, simply copies the debug info
+ * from old to new.
+ */
+void default_dbg_info_merge_pair(ir_node *nw, ir_node *old, dbg_action info);
+
+/**
+ * The default merge_sets_func implementation, does nothing
+ */
+void default_dbg_info_merge_sets(ir_node **new_nodes, int n_new_nodes,
+ ir_node **old_nodes, int n_old_nodes,
+ dbg_action info);
+