[GHC] #3168: Unhelpful error message about "hidden" packages

[GHC]

#3168: Unhelpful error message about "hidden" packages
---------------------------------+------------------------------------------
    Reporter:  simonpj           |        Owner:                  
        Type:  bug               |       Status:  new             
    Priority:  normal            |    Milestone:  6.12.1          
   Component:  Compiler          |      Version:  6.10.2          
    Severity:  normal            |   Resolution:                  
    Keywords:                    |   Difficulty:  Easy (1 hr)     
    Testcase:                    |           Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |  
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Comment (by igloo):

 Or perhaps Cabal should pass GHC a `-cabal` flag, and we could give a
 different error when that flag is given. Might be useful in other cases
 too.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3168#comment:2>
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