[GHC] #10151: Compilation failed on mac, ghc: panic! (the 'impossible' happened)

[GHC]

#10151: Compilation failed on mac, ghc: panic! (the 'impossible' happened)
-------------------------------+-------------------------------------------
        Reporter:  jaseemabid  |                   Owner:
            Type:  bug         |                  Status:  infoneeded
        Priority:  normal      |               Milestone:
       Component:  GHCi        |                 Version:  7.8.3
      Resolution:              |                Keywords:
Operating System:  MacOS X     |            Architecture:  Unknown/Multiple
 Type of failure:  GHCi crash  |               Test Case:
      Blocked By:              |                Blocking:
 Related Tickets:              |  Differential Revisions:
-------------------------------+-------------------------------------------
Changes (by trommler):

 * cc: hvr (added)
 * failure:  None/Unknown => GHCi crash
 * status:  new => infoneeded
 * component:  Compiler => GHCi


Comment:

 This looks like #10058 which is fixed in HEAD. Can you try your code with
 HEAD?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10151#comment:1>
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