[GHC] #1613: Derived types unequal with let binding

[GHC]

#1613: Derived types unequal with let binding
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    Reporter:  popcount at gmail.com  |        Owner:         
        Type:  support request     |       Status:  closed 
    Priority:  normal              |    Milestone:         
   Component:  Compiler            |      Version:  6.7    
    Severity:  major               |   Resolution:  invalid
    Keywords:                      |   Difficulty:  Unknown
          Os:  Unknown             |     Testcase:         
Architecture:  Unknown             |  
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Comment (by Isaac Dupree):

 let-bindings generalize, (is there an effect if they are affected by the
 monomorphism restriction?), which could have odd effects with type-system
 extensions (which doesn't tell me, either, whether this is a bug).

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1613>
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