[GHC] #5610: Improve "Unacceptable argument type in foreign declaration" error message (was: zlib fails to build due to Safe Haskell on GHC master)

[GHC]

#5610: Improve "Unacceptable argument type in foreign declaration" error message
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    Reporter:  bgamari            |        Owner:              
        Type:  bug                |       Status:  new         
    Priority:  high               |    Milestone:  7.4.1       
   Component:  libraries (other)  |      Version:  7.3         
    Keywords:  zlib               |     Testcase:              
   Blockedby:                     |   Difficulty:              
          Os:  Linux              |     Blocking:              
Architecture:  x86_64 (amd64)     |      Failure:  None/Unknown
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5610#comment:4>
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