[GHC] #589: Various poor type error messages

[GHC]

#589: Various poor type error messages
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 Reporter:  Peter A Jonsson [pj at ludd.ltu.se]  |          Owner:         
     Type:  bug                               |         Status:  new    
 Priority:  low                               |      Milestone:  _|_    
Component:  Compiler (Type checker)           |        Version:  6.4.1  
 Severity:  minor                             |     Resolution:         
 Keywords:                                    |     Difficulty:  Unknown
 Testcase:                                    |   Architecture:  Unknown
       Os:  Unknown                           |  
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Comment (by simonpj):

 See also #451

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/589#comment:5>
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