[GHC] #3090: ghc-pkg update should fail if dependent packages might break

[GHC]

#3090: ghc-pkg update should fail if dependent packages might break
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    Reporter:  simonmar          |        Owner:                  
        Type:  bug               |       Status:  new             
    Priority:  normal            |    Milestone:                  
   Component:  Compiler          |      Version:  6.10.1          
    Severity:  normal            |   Resolution:                  
    Keywords:                    |   Difficulty:  Unknown         
    Testcase:                    |           Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |  
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Comment (by malcolm.wallace at cs.york.ac.uk):

 Or cabal-install could use ghc-pkg register --force on all dependent
 packages (but not on the root package?)

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3090#comment:2>
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