Why is there an arrow between $a and [2], but not between [2] and {“bar”}, in this?

  $a->[2]{"bar"}

The highest rated SO answer here explains a little, and it’s the kind of situational nitpickiness that let to me dropping Perl like a hot potato when something better matching my mental model came across my radar: https://stackoverflow.com/questions/1817394/whats-the-differ...