[GHC] #7990: ghc-pkg warning shows the wrong command

[GHC]

#7990: ghc-pkg warning shows the wrong command
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Reporter:  mcandre           |          Owner:                  
    Type:  bug               |         Status:  new             
Priority:  normal            |      Component:  Package system  
 Version:  7.6.3             |       Keywords:                  
      Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
 Failure:  Other             |      Blockedby:                  
Blocking:                    |        Related:                  
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 When ghc-pkg observes your cache is out of date, it displays a helpful
 warning, recommending "ghc-pkg recache". However, sometimes running this
 command does not fix the problem, because it targets the wrong cache.

 For out of date global caches, "ghc-pkg --global recache" successfully
 clears the warning. For out of date user caches, "ghc-pkg --user recache"
 clears the warning.

 In the future, could ghc-pkg display the command more specific to the
 problem?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7990>
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