Operator associativity defines what happens if a sequence of the same
operators is used one after another: whether the evaluator will evalu-
ate the left operations first or the right.  For example, in "8 - 4 -
2", subtraction is left associative so Perl evaluates the expression
left to right. "8 - 4" is evaluated first making the expression "4 - 2
== 2" and not "8 - 2 == 6".