[GHC] #12843: Simplifier ticks exhausted When trying UnfoldingDone $

[GHC]

#12843: Simplifier ticks exhausted When trying UnfoldingDone $
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        Reporter:  MikolajKonarski   |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #12776 #12789     |  Differential Rev(s):
  #12675                             |
       Wiki Page:                    |
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Comment (by MikolajKonarski):

 Regarding HEAD build failures, I have the same problem with TH and HEAD on
 travis (https://travis-ci.org/LambdaHack/LambdaHack/jobs/177586413). I
 just ran it with -v2 flag for cabal, to get some more info: https://api
 .travis-ci.org/jobs/179766413/log.txt?deansi=true

 There are some panics there that may be of interest to GHC hackers.

 The package template-haskell seems to be required by free-4.12.4
 bifunctors-5.4.1 aeson-1.0.2.1 enummapset-th-0.6.1.1 exceptions-0.8.3
 functor-infix-0.0.4 tagged-0.8.5

 Of these, e.g., https://hackage.haskell.org/package/functor-infix depends
 on (>=2.8 && <2.12), so that may be the reason for reinstallation.

 I don't see the problem with parsec in my log, perhaps because parsec is
 only needed with the -fvty flag. The travis log above is from a build with
 no flags (it uses gtk2hs). Yet another option is -fcurses, but it won't
 help with template-haskell, unfortunately.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12843#comment:7>
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