well i voted 'trailing comma' since that is what i fail in other languages (especially in sql, where this almost everytime results in meaningless error messages from braindead DBMS).
if however, the subject is something bigger then i would say 'useful error messages in most cases'
Re: If I was forced to program in another language, the Perl language feature I would miss most would be:
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Of the choices presented, I selected 'trailing comma' as well. I really like
being able to construct lists that are easy to extend by simply inserting new
lines without having to remember to hang the comma on the previous last line.