bug#11964: describe-char causes a fatal error (abort trap: 6) in non-windowed mode

[Chong Yidong]

Dan Maftei <ninestraycats@gmail.com> writes:

> GNU Emacs 24.1.1 (x86_64-apple-darwin11.4.0, NS apple-appkit-1138.47)
>
> emacs -Q -nw
> n C-x 8 <RET> 0303 <RET> C-b C-u C-x =
>
> This crashes emacs. I am returned to bash. "Fatal error (10)" is
> written to the screen. After about 3 seconds, "Abort trap: 6" is
> appended to the same line, and I am returned to the prompt.

I could on reproduce this on x86_64-unknown-linux-gnu with either Emacs
24.1 or latest emacs-24 branch.  This may be Mac-only; could someone
running on Mac OS please check?