[GHC] #1643: Unnecessary dictionaries

[GHC]

#1643: Unnecessary dictionaries
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    Reporter:  guest     |        Owner:         
        Type:  bug       |       Status:  new    
    Priority:  normal    |    Milestone:         
   Component:  Compiler  |      Version:  6.7    
    Severity:  normal    |   Resolution:         
    Keywords:            |   Difficulty:  Unknown
          Os:  MacOS X   |     Testcase:         
Architecture:  x86       |  
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Comment (by chevalier at alum.wellesley.edu):

 {{{-fdicts-cheap}}} does the trick as well. I notice there's a comment on
 line 1045 of {{{coreSyn/CoreUtils.lhs}}} that says:

 "       -- One could go further and make exprIsCheap reply True to any
         -- dictionary-typed expression, but that's more work."

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1643>
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