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### `debug`

`debug`
  :: Forces to enter into debugging mode.

Function `debug` is a function with no argument. It can be called without ``()'`.
- In the debug-mode, you are prompted by `(debug)` and the debugger is ready for commands. Typing in `quit` (Note! without a semicolon.) brings you to exit the debug-mode.
- See section Debugger for details.

    [1] debug;
    (debug) quit
    0
    [2]

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