+/** The type of the debug info retriever function. */
+typedef const char *(*retrieve_dbg_func)(const dbg_info *dbg, unsigned *line);
+
+/**
+ * Sets a debug info retriever.
+ *
+ * @param func the debug retriever function.
+ */
+void be_set_debug_retrieve(retrieve_dbg_func func);
+
+/**
+ * Retrieve the debug info.
+ */
+const char *be_retrieve_dbg_info(const dbg_info *dbg, unsigned *line);
+