[GHC] #7567: invalidateModSummaryCache throws exception if ms_hs_date is 0

[GHC]

#7567: invalidateModSummaryCache throws exception if ms_hs_date is 0
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    Reporter:  edsko             |       Owner:                  
        Type:  bug               |      Status:  new             
    Priority:  high              |   Milestone:  7.8.1           
   Component:  Compiler          |     Version:  7.6.1           
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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Changes (by igloo):

  * priority:  normal => high
  * difficulty:  => Unknown
  * milestone:  => 7.8.1


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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7567#comment:3>
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