[GHC] #2648: Report out of date interface files robustly

[GHC]

#2648: Report out of date interface files robustly
---------------------------------+------------------------------------------
    Reporter:  simonpj           |       Owner:                  
        Type:  feature request   |      Status:  new             
    Priority:  lowest            |   Milestone:  7.6.2           
   Component:  GHCi              |     Version:  7.6.3           
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  GHCi crash      
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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Changes (by liyang):

  * failure:  None/Unknown => GHCi crash
  * component:  Compiler => GHCi


Comment:

 For what it's worth, I don't think I have ever seen this when compiling
 the project.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2648#comment:10>
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