[GHC] #2445: better error message needed for missing package files

[GHC]

#2445: better error message needed for missing package files
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 Reporter:  duncan    |          Owner:             
     Type:  bug       |         Status:  new        
 Priority:  normal    |      Milestone:  6.10 branch
Component:  Compiler  |        Version:  6.8.3      
 Severity:  normal    |     Resolution:             
 Keywords:            |     Difficulty:  Unknown    
 Testcase:            |   Architecture:  Unknown    
       Os:  Unknown   |  
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Comment (by duncan):

 It would be great if `ghc-pkg check` would also stat all the files that we
 know we need for each package (ie the .hi files for all modules and the
 library .a files) and report any borked packages.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2445#comment:2>
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