+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 *);