$success = TRUE;

if not 'a' IN 'a', 'b', 1 + 1 $success = FALSE;
if not 'a' IN ('a', 'b', 1 + 1) $success = FALSE;

# FIXME: precendence
# if 40 + 2 IN 'a' $success = FALSE;

if (40 + 2) IN 'a', 1.2.3.4, "b", "a" + 'b', now(), 24 $success = FALSE;

$id = 42;
$id1 = 1;
$id2 = 2;

if $id in $id1, $id2 $success = FALSE;
if $id in ($id1, $id2) $success = FALSE;

if $id in (1, 2, 3) $success = FALSE;

if $id not in 42, 1, 2 $success = FALSE;
if $id not in (42, 1, 2) $success = FALSE;

if $id not in $id $success = FALSE;
if not $id in $id $success = FALSE;


