[GHC] #2648: Report out of date interface files robustly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#2648: Report out of date interface files robustly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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Comment(by liyang):

 I'm not entirely sure if what I'm seeing is due to out-of-date interface
 files, but see the details below:
 {{{
 ghc: panic! (the 'impossible' happened)
   (GHC version 7.6.3 for x86_64-unknown-linux):
         tcIfaceGlobal (local): not found:
 <<details unavailable>>
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2648#comment:11>
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