bug#18339: 24.4.50; Inserting '$' in TeX-mode cause Emacs crashed in MS-Windows with trunk.

[Eli Zaretskii]

> Date: Thu, 28 Aug 2014 02:18:09 +0800
> From: Chris Zheng <chriszheng99@gmail.com>
> 
> 
> I found Emacs crashed when I insert '}' after '\frac{}' in
> tex-mode. Then I started emacs with '-Q' and found that the following
> steps can reproduce the bug:
> 1. start Emacs with emacs -Q.
> 2. C-x C-f to visit a new TeX file, e.g. C:\a.tex.
> 3. In the opened buffer, type $ from keyboard. A signal SIGSEGV
> received with the following message:
> Program received signal SIGSEGV, Segmentation fault.
> 0x00000004001d0b50 in dec_bytepos (bytepos=0) at syntax.c:510
> 510     DEC_POS (bytepos);

Thanks, I fixed this in trunk revision 117752.