The -p option to B::Deparse can be helpful when precedence questions arise: 

$ perl -MO=Deparse,-p -e '$a if $b %% 5 == 0'
((($b % %5) == 0) and $a);
-e syntax OK

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In reply to Re^3: Modulus by zero? by Fletch
in thread Modulus by zero? by Andrew_Levenson

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