[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:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:  invalid           |             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):

 Oh, great, thanks for the fix. I just tried and it failed, but the HEAD on
 travis is ghc-head_8.1.20161125+git.0.f8c966c, so your fix is not yet
 included. If the problem persists when the HEAD is updated on travis, I
 will open a new ticket. BTW, I've tried on travis and couldn't reproduce
 `Iface Id out of scope` on any GHC version, with any optimization flags,
 so I'd probably need to recompile in a sandbox on my machine and attach
 sandbox config for reproduction, which is probably too much trouble for
 anybody willing to investigate (assuming it's enough to repro). Let's hope
 somebody finds a less fragile example or that it's caused by some bitrot
 on my machine.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12843#comment:14>
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