[GHC] #8743: The impossible happened : Prelude.(!!): index too large

[GHC]

#8743: The impossible happened : Prelude.(!!): index too large
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       Reporter:  erikd           |             Owner:
           Type:  bug             |            Status:  new
       Priority:  normal          |         Milestone:
      Component:  Compiler        |           Version:  7.8.1-rc1
       Keywords:                  |  Operating System:  Unknown/Multiple
   Architecture:  x86_64 (amd64)  |   Type of failure:  Compile-time crash
     Difficulty:  Unknown         |         Test Case:
     Blocked By:                  |          Blocking:
Related Tickets:                  |
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 Running ghc git HEAD (reports it's version as 7.9.20140206) and when cabal
 installing postgresql-simple I get:

 {{{
 ghc: panic! (the 'impossible' happened)
   (GHC version 7.9.20140206 for x86_64-unknown-linux):
         Prelude.(!!): index too large


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

 cabal: Error: some packages failed to install:
 postgresql-simple-0.4.0.2 failed during the building phase. The exception
 was:
 }}}

 postgresql-simple-0.4.0.2 installs fine with 7.6.3. I'm going to compile
 7.8-rc1 and see if the same problem exists there.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8743>
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