[GHC] #8331: GHC fails to apply {-# SPECIALIZE #-} for dubious reasons

[GHC]

#8331: GHC fails to apply {-# SPECIALIZE #-} for dubious reasons
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              Reporter:  blitzcode   |             Owner:
                  Type:  bug         |            Status:  new
              Priority:  normal      |         Milestone:  7.10.1
             Component:  Compiler    |           Version:  7.8.3
            Resolution:              |          Keywords:
Differential Revisions:              |  Operating System:  Unknown/Multiple
          Architecture:              |   Type of failure:  Incorrect
  Unknown/Multiple                   |  warning at compile-time
            Difficulty:  Unknown     |         Test Case:
            Blocked By:              |          Blocking:
       Related Tickets:              |
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Comment (by blitzcode):

 (I knew about that switch, but I didn't know how to install a package for
 my freshly build GHC without interfering with my normal package database.
 I found some instructions on the GHC wiki for avoiding this issue, though.
 Apologies for missing them the first time around...)

 I get the same result as you, the warning seems to be gone. Thanks a lot!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8331#comment:6>
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