bug#24206: 25.1; Curly quotes generate invalid strings, leading to a segfault

[Eli Zaretskii]

> From: Philipp Stephani <p.stephani2@gmail.com>
> Date: Thu, 11 Aug 2016 23:51:41 +0000
> Cc: 24206@debbugs.gnu.org
> 
> Eli Zaretskii <eliz@gnu.org> schrieb am Do., 11. Aug. 2016 um 13:05 Uhr:
> 
>  > From: Phil <p.stephani2@gmail.com>
>  > Date: Thu, 11 Aug 2016 11:55:05 -0700
>  >
>  >
>  > Build is from the emacs-25 branch.
>  >
>  > $ ./emacs -Q -eval "(progn (defface test nil \"\`\\240'\") (customize-face 
> 'test))"
>  >
>  > character.h:703: Emacs fatal error: assertion failed: CHAR_VALID_P (ch)
>  > Fatal error 6: Aborted
>  >
>  > I think this is serious enough to be release-blocking. Seen in the wild
>  > with older versions of show-wspace.el.
> 
>  Please show the real-life example where this rears its ugly head. The
>  recipe (which is appreciated) is obscure enough to be easily avoided,
>  so it doesn't yet convince me this should block a release. There's
>  always one more crash out there.
> 
> Ubuntu Trusty Tahr (supported until 2019) contains a package 
> emacs-goodies-el, which contains a file
> show-wspace.el, which contains a face with the docstring "*Face for 
> highlighting non-breaking spaces
> (`\240')in Font-Lock mode." Attempting to customize that face leads to the 
> segfault. 

John, do you want us to wait with the next RC until this is fixed?