+extern char *readline_line_completion_function (const char *text,
+ int matches);
+
+extern VEC (char_ptr) *noop_completer (struct cmd_list_element *,
+ const char *, const char *);
+
+extern VEC (char_ptr) *filename_completer (struct cmd_list_element *,
+ const char *, const char *);
+
+extern VEC (char_ptr) *expression_completer (struct cmd_list_element *,
+ const char *, const char *);
+
+extern VEC (char_ptr) *location_completer (struct cmd_list_element *,
+ const char *, const char *);
+
+extern VEC (char_ptr) *command_completer (struct cmd_list_element *,
+ const char *, const char *);
+
+extern VEC (char_ptr) *signal_completer (struct cmd_list_element *,
+ const char *, const char *);