[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 simonpj):

 Thanks.  I followed your repro steps above, and it all worked fine... not
 `Iface Id out of scope`.  Here's the last two steps
 {{{
 simonpj at cam-05-unx:~/tmp/LambdaHack/LambdaHack$  touch
 GameDefinition/Main.hs
 simonpj at cam-05-unx:~/tmp/LambdaHack/LambdaHack$  cabal build --ghc-option
 =-fsimpl-tick-factor=200
 Building LambdaHack-0.5.1.0...
 Preprocessing library LambdaHack-0.5.1.0...
 Preprocessing executable 'LambdaHack' for LambdaHack-0.5.1.0...
 [15 of 15] Compiling Main             ( GameDefinition/Main.hs,
 dist/build/LambdaHack/LambdaHack-tmp/Main.o )
 Linking dist/build/LambdaHack/LambdaHack ...
 }}}

 The first step failed, so I skipped it.
 {{{
 bash$ git checkout master
 error: pathspec 'master' did not match any file(s) known to git.
 bash$ git branch
 * simplifying-threaded-mode
 }}}
 Maybe we should give up on this.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12843#comment:9>
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