[GHC] #9170: haddock: panic! (the 'impossible' happened)

[GHC]

#9170: haddock: panic! (the 'impossible' happened)
-----------------------------------+---------------------------------------
       Reporter:  diego.saa        |             Owner:
           Type:  bug              |            Status:  new
       Priority:  normal           |         Milestone:
      Component:  Compiler         |           Version:  7.8.2
       Keywords:                   |  Operating System:  MacOS X
   Architecture:                   |   Type of failure:  Compile-time crash
  Unknown/Multiple                 |         Test Case:
     Difficulty:  Unknown          |          Blocking:
     Blocked By:                   |
Related Tickets:                   |
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 After running "cabal install yi", I got this message:

 dist/build/tmp-79484/src/library/Yi/Eval.hs:139:5: Warning:
     Defined but not used: `publishedActions_'
   73% ( 11 / 15) in 'Yi.Eval'
   19% (  5 / 26) in 'Yi.Modes'
   25% (  1 /  4) in 'Yi.Mode.IReader'
    0% (  0 /  2) in 'Yi.Mode.Compilation'
   33% (  1 /  3) in 'Yi.Mode.JavaScript'
   50% (  2 /  4) in 'Yi.Mode.Latex'
   31% (  4 / 13) in 'Yi.Mode.Interactive'
   60% (  9 / 15) in 'Yi.Command'
   58% ( 15 / 26) in 'Yi.Keymap.Emacs.Utils'
 haddock: panic! (the 'impossible' happened)
   (GHC version 7.6.3 for x86_64-apple-darwin):
         mkWWcpr: not a product
 <<details unavailable>>

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

 Installing library in
 /Users/diegos/Library/Haskell/ghc-7.6.3/lib/yi-0.8.1/lib
 Installing executable(s) in
 /Users/diegos/Library/Haskell/ghc-7.6.3/lib/yi-0.8.1/bin
 Registering yi-0.8.1...
 Installed yi-0.8.1

 I'm on OS 10.9.3, GHC 7.6.3.

 Please let me know if I can provide any other info that could be helpful,
 or if a full output would help.

 Thanks,
 Diego Saa

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9170>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler