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

[GHC]

#7713: Panic! make_exp (App _ (Coercion _)) when compiled with -fext-core
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    Reporter:  EduardSergeev     |       Owner:                    
        Type:  bug               |      Status:  new               
    Priority:  normal            |   Milestone:                    
   Component:  Compiler          |     Version:  7.6.2             
    Keywords:  -fext-core panic  |          Os:  Linux             
Architecture:  x86_64 (amd64)    |     Failure:  Compile-time crash
  Difficulty:  Unknown           |    Testcase:                    
   Blockedby:                    |    Blocking:                    
     Related:                    |  
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Description changed by igloo:

Old description:

> 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 _))

New description:

 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#comment:3>
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