[GHC] #12241: Surprising constructor accumulation

[GHC]

#12241: Surprising constructor accumulation
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        Reporter:  dfeuer            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Runtime System    |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonmar):

 I haven't looked into this specific issue, but I just wanted to mention
 that the "selector thunk" optimisation that would eliminate those pairs in
 the heap is sometimes fragile.  See #2607 for example.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12241#comment:1>
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