[GHC] #1127: Make mtl lazier

[GHC]

#1127: Make mtl lazier
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 Reporter:  igloo              |          Owner:         
     Type:  proposal           |         Status:  new    
 Priority:  normal             |      Milestone:  Not GHC
Component:  libraries (other)  |        Version:  6.6    
 Severity:  normal             |     Resolution:         
 Keywords:                     |     Difficulty:  Unknown
 Testcase:                     |   Architecture:  Unknown
       Os:  Unknown            |  
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Comment (by simonmar):

 I don't mind whether StateT itself is lazy or not, but I think we should
 have a strict version.  In GHC the implementation should use unboxed
 tuples, like IO.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1127>
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