[GHC] #13379: Space leak / quadratic behavior when inlining

[GHC]

#13379: Space leak / quadratic behavior when inlining
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        Reporter:  jberryman         |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by mpickering):

 I think that the problem is that `>>` and then `thenIO` gets inlined which
 in this case causes the compiler to generate heaps of code to simplify. I
 tried using `Identity` and it compiled instantly.

 It seems plausible that that this shouldn't take a long time but more
 investigation into what exactly is taking a long time is needed.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13379#comment:6>
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