Help for this page
Ovid@OT-D1 ~ $ perl -MData::Dumper -e ' ... $x->can('bar'); print Dumper (\%Foo::); print Dumper (\%UNIVERSAL::)'
$VAR1 = {}; $VAR1 = { ... 'isa' => *UNIVERSAL::isa, 'VERSION' => *UNIVERSAL::VERSION };