| rustrt |
| CompletionCb | The callback used to perform completions. |
| add_history | Add a line to history |
| complete | Bind to the main completion callback in the current task. |
| load_history | Load line history from a file |
| read | Print out a prompt and then wait for input and return it |
| save_history | Save line history to a file |
| set_history_max_len | Set the maximum amount of lines stored |
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