[GHC] #14338: Simplifier fails with "Simplifier ticks exhausted"

[GHC]

#14338: Simplifier fails with "Simplifier ticks exhausted"
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        Reporter:  dredozubov        |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 I can't even get to base-camp (with HEAD).  cabal install (with `--allow-
 newer` else nothing at all works) says
 {{{
 ....lots of stuff...
 Preprocessing library unordered-containers-0.2.8.0...
 [1 of 8] Compiling Data.HashMap.PopCount ( Data/HashMap/PopCount.hs,
 dist/build/Data/HashMap/PopCount.o )
 [2 of 8] Compiling Data.HashMap.Unsafe ( Data/HashMap/Unsafe.hs,
 dist/build/Data/HashMap/Unsafe.o )
 [3 of 8] Compiling Data.HashMap.Array ( Data/HashMap/Array.hs,
 dist/build/Data/HashMap/Array.o )
 [4 of 8] Compiling Data.HashMap.UnsafeShift ( Data/HashMap/UnsafeShift.hs,
 dist/build/Data/HashMap/UnsafeShift.o )
 [5 of 8] Compiling Data.HashMap.Base ( Data/HashMap/Base.hs,
 dist/build/Data/HashMap/Base.o )
 [6 of 8] Compiling Data.HashMap.Strict ( Data/HashMap/Strict.hs,
 dist/build/Data/HashMap/Strict.o )
 [7 of 8] Compiling Data.HashMap.Lazy ( Data/HashMap/Lazy.hs,
 dist/build/Data/HashMap/Lazy.o )
 [8 of 8] Compiling Data.HashSet     ( Data/HashSet.hs,
 dist/build/Data/HashSet.o )

 Data/HashSet.hs:80:39: error:
     Module ‘Data.Semigroup’ does not export ‘Monoid(..)’
    |
 80 | import Data.Semigroup (Semigroup(..), Monoid(..))
    |                                       ^^^^^^^^^^
 cabal: Leaving directory '/tmp/cabal-tmp-22962/unordered-
 containers-0.2.8.0'
 Installed iproute-1.7.1
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14338#comment:6>
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