[GHC] #8986: GHC panic while installing distributive library on Mac OS X Mavericks

[GHC]

#8986: GHC panic while installing distributive library on Mac OS X Mavericks
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       Reporter:  mvanier           |             Owner:
           Type:  bug               |            Status:  new
       Priority:  normal            |         Milestone:
      Component:  Compiler          |           Version:  7.8.1
       Keywords:                    |  Operating System:  Unknown/Multiple
   Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
     Difficulty:  Unknown           |         Test Case:
     Blocked By:                    |          Blocking:
Related Tickets:                    |
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 While trying to install Snap from cabal, the install failed while
 installing the distributive-0.4.3.1 library.  Specifically, I got this:

 > cabal install distributive
 Resolving dependencies...
 [1 of 1] Compiling Main             (
 /var/folders/76/d5y5v4wx7ybccp__l44r5cg00000gn/T/distributive-0.4.3.1-16721/distributive-0.4.3.1/Setup.lhs,
 /var/folders/76/d5y5v4wx7ybccp__l44r5cg00000gn/T/distributive-0.4.3.1-16721/distributive-0.4.3.1/dist/setup/Main.o
 )
 Linking
 /var/folders/76/d5y5v4wx7ybccp__l44r5cg00000gn/T/distributive-0.4.3.1-16721/distributive-0.4.3.1/dist/setup/setup
 ...
 Configuring distributive-0.4.3.1...
 Building distributive-0.4.3.1...
 Preprocessing library distributive-0.4.3.1...
 [1 of 2] Compiling Data.Distributive.Generic (
 src/Data/Distributive/Generic.hs, dist/build/Data/Distributive/Generic.o )
 [2 of 2] Compiling Data.Distributive ( src/Data/Distributive.hs,
 dist/build/Data/Distributive.o )
 Loading package ghc-prim ... linking ... done.
 Loading package integer-gmp ... linking ... done.
 Loading package base ... linking ... done.
 Loading package transformers-0.3.0.0 ... linking ... done.
 Loading package transformers-compat-0.1.1.1 ... ghc:
 /Users/mvanier/Library/Haskell/ghc-7.6.3/lib/transformers-
 compat-0.1.1.1/lib/HStransformers-compat-0.1.1.1.o: Bad magic. Expected:
 feedfacf, got: feedface.

 ghc: panic! (the 'impossible' happened)
   (GHC version 7.6.3 for x86_64-apple-darwin):
         loadObj "/Users/mvanier/Library/Haskell/ghc-7.6.3/lib
 /transformers-compat-0.1.1.1/lib/HStransformers-compat-0.1.1.1.o": failed

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

 Failed to install distributive-0.4.3.1
 cabal: Error: some packages failed to install:
 distributive-0.4.3.1 failed during the building phase. The exception was:
 ExitFailure 1

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8986>
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