Update:
Whoops! I didn't see mulander's reply when our ships passed in the night!

From perlop:

A common mistake is to try to separate the words with comma or to put comments into a multi-line qw-string. For this reason, the use warnings pragma and the -w switch (that is, the $^W variable) produces warnings if the STRING contains the "," or the "#" character.

In reply to Re: Explain comments in qw// quoted data by wfsp
in thread Explain comments in qw// quoted data by jesuashok

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