PIPESTATUS array is incorrect after a trap

[Florian Bruhin]

Configuration Information [Automatically generated, do not change]:
Machine: i486
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='i486'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i486-pc-linux-gnu'
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash'
-DSHELL -DHAVE_CONFIG_H -I. -I../bash -I../bash/include
-I../bash/lib -g -O2
uname output: Linux vpc 2.6.18-6-686 #1 SMP Thu Nov 5 16:28:13 UTC
2009 i686 GNU/Linux
Machine Type: i486-pc-linux-gnu

Bash Version: 3.1
Patch Level: 17
Release Status: release

Description:
When a trap is caught while a pipe is running, the $PIPESTATUS
array contains the exit values of the trap.
$? seems to work fine (it's 1 from the pipe in my example),
but the PIPESTATUS array not.

Repeat-By:
trap 'true' USR1
echo "PID: $$"
# Send USR1 to the script from another shell while sleep is running
false | sleep 10 | false
echo "\$?: $? | \${PIPESTATUS[@]}: ${PIPESTATUS[@]}"