If you leave the parenthesis off, like this:
if ($mday == 1 && $month == 1) {
handelNewYear; # Typo in function name.
}
then the code won't compile under 'use strict'.
Leaving parens off isn't always possible without writing
uncommon idiom, but in many cases you can leave the parens
off, and it'll capture many mistyped sub names.
Abigail
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