[GHC] #13106: impossible happened: initTc: unsolved constraints

[GHC]

#13106: impossible happened: initTc: unsolved constraints
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           Reporter:  codygman       |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
           Keywords:  initTc         |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Below is the error:

 I got the following error:

 ghc: panic! (the 'impossible' happened)
       (GHC version 8.0.1.20161213 for x86_64-unknown-linux):
         initTc: unsolved constraints
       WC {wc_insol =
             [W] cp_a6SB :: t_a6SA[tau:1] (CHoleCan: cp)
             [W] minimal_a6SI :: t_a6SH[tau:1] (CHoleCan: minimal)
             [W] frames_a6SL :: t_a6SK[tau:1] (CHoleCan: frames)
             [W] ps_a6Tb :: t_a6Ta[tau:1] (CHoleCan: ps)
             [W] minimal_a6Ti :: t_a6Th[tau:1] (CHoleCan: minimal)
             [W] frames_a6Tm :: t_a6Tl[tau:1] (CHoleCan: frames)
             [W] map_hd_a6Tv :: t_a6Tu[tau:1] (CHoleCan: map_hd)
             [W] ps_a6Ty :: t_a6Tx[tau:1] (CHoleCan: ps)}

 It was created with this repo: https://github.com/codygman/minimal-frames-
 lookup-map/blob/master/src/Main.hs

 Apologies for the setup needed, but I also had to download judy-0.3.0
 manually and then include it for it to build (not sure why, but unrelated
 problem I think).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13106>
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