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

[GHC]

#12843: Simplifier ticks exhausted When trying UnfoldingDone $
-------------------------------------+-------------------------------------
        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:                    |
-------------------------------------+-------------------------------------

Comment (by MikolajKonarski):

 Regarding "ticks-exhausted", yes the inlining is excessive and I don't
 have any reason to suppose anything is amiss, apart of the fact that I
 need 10 times more ticks than the amount that triggers "panic! (the
 'impossible' happened)".

 Regarding `Iface Id out of scope`, I've just reproduced it just as in the
 original report. Here is a quicker way to reproduce:

 {{{
 git checkout master
 git reset --hard 842070fe78f07e2fb0bce829505dcfa8465ef40f
 cabal configure
 cabal build --ghc-option=-fsimpl-tick-factor=200
 touch GameDefinition/Main.hs
 cabal build --ghc-option=-fsimpl-tick-factor=200
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12843#comment:8>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler