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bug#20966: 25.0.50; `button-at': (wrong-type-argument integer-or-marker-

From: Lars Ingebrigtsen
Subject: bug#20966: 25.0.50; `button-at': (wrong-type-argument integer-or-marker-p nil), and *Backtrace* broken
Date: Sat, 30 Apr 2016 22:05:33 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux)

Drew Adams <address@hidden> writes:

> Double regression, it seems.  Perhaps this has been fixed since this
> build, but I cannot find a Windows binary that is more recent, so I
> can't get beyond this.
> 1. Non-nil debug-on-error gives a _completely empty *Backtrace* buffer_,
> except for the first line, which says "Debugger entered--Lisp error:
> (args-out-of-range 20324)".  I've never seen that before, but I get it
> consistently with this build.
> 2. So I tried `M-x debug-on-entry describe-function-1', to see what
> went wrong.  Here's a backtrace, from using `describe-function':
> Debugger entered--Lisp error: (wrong-type-argument integer-or-marker-p nil)
> * get-char-property(nil button)
> * button-at(nil)
> * help-xref-button(1 help-function-def icicle-highlight-input-noncompletion=
>  "d:/usr/drew/drews-lisp-20/icicles-fn.el")

Do you have a recipe to reproduce this bug?

(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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