[GHC] #9309: Regression when building the 'sizes' application

[GHC]

#9309: Regression when building the 'sizes' application
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        Reporter:  JohnWiegley                |            Owner:
            Type:  bug                        |           Status:  new
        Priority:  normal                     |        Milestone:  7.10.1
       Component:  Compiler                   |          Version:  7.8.3
      Resolution:                             |         Keywords:
Operating System:  Unknown/Multiple           |     Architecture:
 Type of failure:  GHC rejects valid program  |  Unknown/Multiple
       Test Case:                             |       Difficulty:  Unknown
        Blocking:                             |       Blocked By:
                                              |  Related Tickets:
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Description changed by nomeata:

Old description:

> I have a package on Hackage called `sizes`.  It builds fine with GHC
> 7.8.2, but when building with 7.8.3 I get:
>
>     ghc: panic! (the 'impossible' happened)
>       (GHC version 7.8.3 for x86_64-apple-darwin):
>         make_exp (App _ (Coercion _))

New description:

 I have a package on Hackage called `sizes`.  It builds fine with GHC
 7.8.2, but when building with 7.8.3 I get:

 {{{
     ghc: panic! (the 'impossible' happened)
       (GHC version 7.8.3 for x86_64-apple-darwin):
         make_exp (App _ (Coercion _))
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9309#comment:1>
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