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$foo->[0] is dereferencing an arrayref
$foo->{bar} is dereferencing a hashref
$foo->(@blah) is dereferencing (and invoking) a function-ref
$foo->bar is calling the method "bar" that is defined in the class tha
+t $foo has been [bless]'ed into.

my $text_index;
if ($token->[0] eq 'T') {
...
} else {
    $text_index = -1;
}