bug#50406: fill-paragraph error

[Lars Ingebrigtsen]

Juri Linkov <juri@linkov.net> writes:

> Please try to open the attached file in emacs -Q, and after moving point
> to the beginning of the 3rd line, type 'M-q'.  When debug-on-error is t,
> it fails with such backtrace:
>
> Debugger entered--Lisp error: (error "Invalid search bound (wrong side
> of point)")
>   re-search-backward("[ \11]\\|\\c|.\\|.\\c|" 280 0)
>   fill-move-to-break-point(280)

I can reproduce this bug, too.

> BTW, evaluating debug-on-error in *scratch* shows t by default,
> but 'C-h v debug-on-error' shows it's nil actually, strange.

With `C-x C-e'?  Then this happens:

---
If ‘eval-expression-debug-on-error’ is non-nil, which is the default,
this command arranges for all errors to enter the debugger.
---


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