# hmmm, looks confusing:
save_as_tree("./root", fetch( url("google.com") ) ); 

# chained calls, but still confusing:
url("google.com")->fetch()->save_as_tree("./root"); 

# full OO:
my $url = Some::Module::Name->new( url => "google.com" );
$url->fetch;
$url->save_as_tree("./root");