[GHC] #7786: strange errors when deducing constraints

[GHC]

#7786: strange errors when deducing constraints
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    Reporter:  heisenbug         |       Owner:  simonpj         
        Type:  bug               |      Status:  new             
    Priority:  normal            |   Milestone:                  
   Component:  Compiler          |     Version:  7.7             
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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Changes (by simonpj):

  * owner:  => simonpj
  * difficulty:  => Unknown


Comment:

 I took a look. I think I know how to improve.  More after the ICFP
 deadline

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7786#comment:1>
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