[GHC] #7713: Panic! make_exp (App _ (Coercion _)) when compiled with -fext-core

[GHC]

#7713: Panic! make_exp (App _ (Coercion _)) when compiled with -fext-core
-------------------------------+--------------------------------------------
Reporter:  EduardSergeev       |          Owner:                  
    Type:  bug                 |         Status:  new             
Priority:  normal              |      Component:  Compiler        
 Version:  7.6.2               |       Keywords:  -fext-core panic
      Os:  Linux               |   Architecture:  x86_64 (amd64)  
 Failure:  Compile-time crash  |      Blockedby:                  
Blocking:                      |        Related:                  
-------------------------------+--------------------------------------------
 An attempt to compile the attached file with 7.6.2 (and 7.4.2) with "-O2
 -fext-core" leads to:

 ghc: panic! (the 'impossible' happened)
   (GHC version 7.6.2 for x86_64-unknown-linux):
     make_exp (App _ (Coercion _))

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7713>
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