Entry : Pre | Post { use Data::Dumper; print Dumper \%item;} # is equivalent to Entry : Pre Entry : Post { use Data::Dumper; print Dumper \%item; } # is equivalent to Entry : Post { use Data::Dumper; print Dumper \%item; } Entry : Pre # is NOT equivalent to Entry : Pre { use Data::Dumper; print Dumper \%item; } Entry : Post { use Data::Dumper; print Dumper \%item; }