A number of distributions do not use a module name to form the distribution name, or leave out the - that usually replaces ::. Examples I can think of offhand are PathTools, DateManip, and TermReadKey. You can fetch http://www.perl.com/CPAN/modules/02packages.details.txt.gz and search for the modules that belong to the distribution you are looking at.

Update: fixed PathTools link

In reply to Re: Checking module (of a level) being installed by ysth
in thread Checking module (of a level) being installed by Tanktalus

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