#!./perl -T
use strict;
use warnings;
use Test::More tests => 5;
use Scalar::Util qw(tainted);
ok( !tainted(1), 'constant number');
my $var = 2;
ok( !tainted($var), 'known variable');
ok( tainted($^X), 'interpreter variable');
$var = $^X;
ok( tainted($var), 'copy of interpreter variable');
{
package Tainted;
sub TIESCALAR { bless {} }
sub FETCH { $^X }
}
tie my $tiedvar, 'Tainted';
ok( tainted($tiedvar), 'for magic variables');