[GHC] #12790: GHC 8.0.1 uses copious amounts of RAM and time when trying to compile lambdabot-haskell-plugins

[GHC]

#12790: GHC 8.0.1 uses copious amounts of RAM and time when trying to compile
lambdabot-haskell-plugins
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        Reporter:  clint             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 I fell at the first fence:
 {{{
 cabal install --with-ghc=/home/simonpj/5builds/HEAD-4/inplace/bin/ghc-
 stage2 --enable-library-profiling
 Resolving dependencies...
 cabal: Could not resolve dependencies:
 trying: hint-0.6.0 (dependency of mueval-0.9.3)
 next goal: ghc-boot-th (dependency of template-haskell-2.11.0.0)
 rejecting: ghc-boot-th-8.1/installed-8.1 (conflict: template-haskell =>
 ghc-boot-th==8.0.*)
 trying: ghc-boot-th-8.0.1
 next goal: ghc (dependency of hint-0.6.0)
 rejecting: ghc-8.1/installed-8.1 (conflict: ghc-boot-th==8.0.1, ghc =>
 ghc-boot-th==8.1/installed-8.1)
 Backjump limit reached (currently 2000, change with --max-backjumps or try
 to
 run with --reorder-goals).
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12790#comment:5>
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