Comma expression in arithmetic evaluation referring to arrays make bash crash.

[Pontus Stenström]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc -I/home/abuild/rpmbuild/BUILD/bash-4.2 -L/home/abuild/rpmbuild/BUILD/bash-4.2/../readline-6.2
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-suse-linux-gnu' -DCONF_VENDOR='suse' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL -DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib   -fmessage-length=0 -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables -fasynchronous-unwind-tables -g  -D_GNU_SOURCE -DRECYCLES_PIDS -Wall -g -std=gnu89 -Wuninitialized -Wextra -Wno-unprototyped-calls -Wno-switch-enum -Wno-unused-variable -Wno-unused-parameter -ftree-loop-linear -pipe -fprofile-use
uname output: Linux urd 3.4.11-2.16-desktop #1 SMP PREEMPT Wed Sep 26 17:05:00 UTC 2012 (259fc87) x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-suse-linux-gnu

Bash Version: 4.2
Patch Level: 24
Release Status: release

Description:
    Comma _expression_ in arithmetic evaluation referring to arrays make bash crash.

Repeat-By:
    This works fine:
    ((c=3, d=4))
    This crashes my bash:
    a=(2 3 4 5)        # OK
    ((c=a[3], d=a[2])) # Crash

Warning: Program '/bin/bash' crashed.

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