pmpath in pmtools (by tchrist) does this, I think.

Here's some other goodies in pmtools.

This is from the dpkg description of pmtools: 

Description: Perl module tools
 Perl module tools is a suite of small tools that help manage and insp
+ect
 perl modules, perl Plain Old Documentation files, and perl programs.
 .
 Some of the things these tools can do include:
  - show the full path to a module
  - show the version and description of a module
  - list all installed modules with descriptions
  - show what files a given program or module loads at compile time
  - show what symbols a module exports
  - list the methods of a class
  - display the source code of a function of a module

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In reply to whichpm = pmpath by bsb
in thread whichpm by belg4mit

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