[GHC] #9507: ghc-pkg mode to query by package-key

[GHC]

#9507: ghc-pkg mode to query by package-key
-------------------------------------+-------------------------------------
       Reporter:  ezyang             |                   Owner:  ezyang
           Type:  feature request    |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  ghc-pkg            |                 Version:  7.9
       Keywords:  backpack           |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Unknown            |         Type of failure:
     Blocked By:                     |  None/Unknown
Related Tickets:                     |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
 Right now, ghc-pkg understands package names and IPIDs. It should support
 package keys too.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9507>
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