grammar_test.pl

grammar foo 
{
  token TOP { ^ .* $ } 
}

class bar 
{
  method TOP ($/)
  {
    say $/; 
    'foobar' ~~ m/foobar/;
  }
}

my $action = bar.new;

say "Calling parse with positional action class";
foo.parse('foobar', :$action);

say "Calling parse with named action class";
foo.parse('foobar', :actions($action));