traps=$(${SH} -c 'trap "echo bad" 0; trap - 0; trap')
[ -z "$traps" ] || exit 1
traps=$(${SH} -c 'trap "echo bad" 0; trap "" 0; trap')
expected_traps=$(${SH} -c 'trap "" EXIT; trap')
[ "$traps" = "$expected_traps" ] || exit 2
traps=$(${SH} -c 'trap "echo bad" 0; trap 0; trap')
[ -z "$traps" ] || exit 3
traps=$(${SH} -c 'trap "echo bad" 0; trap -- 0; trap')
[ -z "$traps" ] || exit 4
traps=$(${SH} -c 'trap "echo bad" 0 1 2; trap - 0 1 2; trap')
[ -z "$traps" ] || exit 5
traps=$(${SH} -c 'trap "echo bad" 0 1 2; trap "" 0 1 2; trap')
expected_traps=$(${SH} -c 'trap "" EXIT HUP INT; trap')
[ "$traps" = "$expected_traps" ] || exit 6
traps=$(${SH} -c 'trap "echo bad" 0 1 2; trap 0 1 2; trap')
[ -z "$traps" ] || exit 7
traps=$(${SH} -c 'trap "echo bad" 0 1 2; trap -- 0 1 2; trap')
[ -z "$traps" ] || exit 8