$ perlcritic -3 --verbose 11 1129720.pl 
Comma used to separate statements at line 7, near '$_,0'.
ValuesAndExpressions::ProhibitCommaSeparatedStatements (Severity: 4)
Perl's comma statement separator has really low precedence, which
leads to code that looks like it's using the comma list element
separator not actually doing so. Conway suggests that the statement
separator not be used in order to prevent this situation.
...