[GHC] #13383: ghc: panic!

[GHC]

#13383: ghc: panic!
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           Reporter:  henenenerik    |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
           Keywords:  Panic          |  Operating System:  Windows
       Architecture:                 |   Type of failure:  Incorrect API
  Unknown/Multiple                   |  annotation
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Tried to compile some code provided in the course I'm taking and caused
 ghc to panic.
 Got this in my command prompt:
 {{{
 [1 of 1] Compiling Main             ( temp.hs, temp.o )
 ghc: panic! (the 'impossible' happened)
   (GHC version 8.0.2 for x86_64-unknown-mingw32):
         initTc: unsolved constraints
   WC {wc_insol =
         [W] throw_a2dw :: t_a2dv[tau:1] (CHoleCan: throw)
         [W] throw_a2eY :: t_a2eX[tau:1] (CHoleCan: throw)
         [W] throw_a2fc :: t_a2fb[tau:1] (CHoleCan: throw)}

  Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13383>
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