[GHC] #7309: The Ix instance for (,) leaks space in range

[GHC]

#7309: The Ix instance for (,) leaks space in range
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    Reporter:  nomeata            |       Owner:                         
        Type:  bug                |      Status:  new                    
    Priority:  normal             |   Milestone:                         
   Component:  libraries (other)  |     Version:  7.6.1                  
    Keywords:                     |          Os:  Unknown/Multiple       
Architecture:  Unknown/Multiple   |     Failure:  Runtime performance bug
  Difficulty:  Unknown            |    Testcase:                         
   Blockedby:                     |    Blocking:                         
     Related:                     |  
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Changes (by simonpj):

  * difficulty:  => Unknown


Comment:

 Aha.  See #7206, still on my stack, but would be delighted if someone took
 this on.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7309#comment:1>
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