[GHC] #5550: GHC infinite loop when compiling vector

[GHC]

#5550: GHC infinite loop when compiling vector
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    Reporter:  simonpj           |        Owner:  rl          
        Type:  bug               |       Status:  new         
    Priority:  normal            |    Milestone:              
   Component:  Compiler          |      Version:  7.2.1       
    Keywords:                    |     Testcase:              
   Blockedby:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Blocking:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
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Comment(by rl):

 If `-fno-spec-constr` solves this then it's probably a !SpecConstr bug and
 not related to rewrite rules. I'll take a look.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5550#comment:4>
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