use Tie::Scalar;
{
    package Some::Class;
    our @ISA = qw(Tie::StdScalar);
    sub DESTROY {
        print "Object destroyed.\n"; 
    }
}

if (1) {
    print "1\n";

    # my $foo = 3;
    tie my $foo, 'Some::Class';
    $foo = 3;

    print "2\n";
}
print "3\n";

__END__
1
2
Object destroyed.
3