Invalid extglob causes segfault with help builtin.

[Geir Hauge]

Configuration Information [Automatically generated, do not change]:
Machine: i686
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i686'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i686-pc-linux-gnu'
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/local/share/locale' -DPACKAGE='bash'
-DSHELL -DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib   -g -O2
uname output: Linux sikozu 3.2.0-40-generic #64-Ubuntu SMP Mon Mar 25
21:22:26 UTC 2013 i686 i686 i386 GNU/Linux
Machine Type: i686-pc-linux-gnu

Bash Version: 4.2
Patch Level: 45
Release Status: release

Description:
One of the side-effects of the latest changes of the help
builtin in the devel release is that ''help "(("'' no longer
shows the help for (( ... )), so I casually threw some asterisks
around it ... and got a segfault. This also happens in bash
4.2.45 and 4.2.25, but not 3.2.48. It only segfaults when
extglob is enabled; probably because it's an incomplete extglob.

Repeat-By:
bash -O extglob -c 'help "*((*"'

-- 
Geir Hauge