[GHC] #13142: Core simplifier crashes while building stack. (was: GHC emits enormous core starting with 'Arity decrease')

[GHC]

#13142: Core simplifier crashes while building stack.
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        Reporter:  jeiea             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.2
      Resolution:                    |             Keywords:
Operating System:  Windows           |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by Phyx-):

 * cc: Simonpj (added)
 * failure:  None/Unknown => Compile-time crash or panic


Comment:

 Thanks for the report, It would be nice if you had a smaller example or
 one that didn't use stack to reproduce this.

 I don't know if this is triggered by an issue in stack, but the simplifier
 shouldn't be crashing. Any ideas Simon?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13142#comment:1>
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