| assertion/1 | Acts similar to C assert() macro. |
| assertion_failed/2 | This hook is called if the Goal of assertion/1 fails. |
| debug/1 | Add/remove a topic from being printed. |
| debug/3 | Format a message if debug topic is enabled. |
| debug_message_context/1 | Specify additional context for debug messages. |
| debug_print_hook/3 | Hook called by debug/3. |
| debugging/1 | Examine debug topics. |
| debugging/2 | Examine debug topics. |
| list_debug_topics/0 | List currently known debug topics and their setting. |
| nodebug/1 | Add/remove a topic from being printed. |