#!perl -w
use Data::Dumper;
$Data::Dumper::Purity=1;

$a = { type => 'int' };
$b = \$a->{type};

print "\n[\$b,\$a]\n";
print Dumper([$b,$a]);
eval Dumper([$b,$a]);
print "\nevalled [\$b,\$a]\n";
print Dumper($VAR1);
print Dumper([$b,$a]) eq Dumper($VAR1) ? "equal\n" : "NOT equal\n";

print "\n[\$a,\$b]\n";
print Dumper([$a,$b]);
eval Dumper([$a,$b]);
print "\nevalled [\$a,\$b]\n";
print Dumper($VAR1);
print Dumper([$a,$b]) eq Dumper($VAR1) ? "equal\n" : "NOT equal\n";
__END__

[$b,$a]
$VAR1 = [
          \'int',
          {
            'type' => ${$VAR1->[0]}
          }
        ];
Use of uninitialized value in scalar dereference at (eval 1) line 4.

evalled [$b,$a]
$VAR1 = [
          \'int',
          {
            'type' => undef
          }
        ];
NOT equal

[$a,$b]
$VAR1 = [
          {
            'type' => 'int'
          },
          do{my $o}
        ];
$VAR1->[1] = \$VAR1->[0]{'type'};

evalled [$a,$b]
$VAR1 = [
          {
            'type' => 'int'
          },
          do{my $o}
        ];
$VAR1->[1] = \$VAR1->[0]{'type'};
equal