para    => sub { $_[1]->set_tag( 'p')  }, # change para to p (handlers receive $twig and $element as argouments)
para    => sub { $_->set_tag( 'p')  },    # change para to p ($_ is aliased to $_[1] for convenience  )


###and in the corpus of the docs:

$_ is also set to the element (ie: $_[1]), so it is easy to write inline handlers like