main::(foo.pl:6):       test_args(Set::Scalar->new());
                                                                                               DB<0> s
Set::Scalar::Base::new(/Library/Perl/5.8.6/Set/Scalar/Base.pm:68):
68:         my $class = shift;
                                                                                               DB<0> r
list context return from Set::Scalar::Base::new:
0  Set::Scalar=HASH(0x18092cc)
   'elements' => HASH(0x194c7d4)
        empty hash
   'universe' => Set::Scalar::Universe=HASH(0x18d312c)
      'elements' => HASH(0x18b1db0)
           empty hash
      'null' => Set::Scalar::Null=HASH(0x18acce4)
         'universe' => Set::Scalar::Universe=HASH(0x18d312c)
            -> REUSED_ADDRESS
      'universe' => undef
main::test_args(foo.pl:10):             my @opt_args;
                                                                                               DB<0> n
main::test_args(foo.pl:11):             while (my $arg = shift)
main::test_args(foo.pl:12):             {
                                                                                               DB<0> s
Set::Scalar::Base::size(/Library/Perl/5.8.6/Set/Scalar/Base.pm:122):
122:        my $self = shift;