[GHC] #675: Bad error message in GHCi

[GHC]

#675: Bad error message in GHCi
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  Reporter:  guest            |          Owner:         
      Type:  feature request  |         Status:  new    
  Priority:  normal           |      Milestone:         
 Component:  GHCi             |        Version:  6.4.1  
  Severity:  normal           |     Resolution:         
  Keywords:                   |             Os:  Unknown
Difficulty:  Unknown          |   Architecture:  Unknown
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Comment (by guest):

 In the context of `Arbitrary` it seems like a bad idea to silently default
 to `()`. You want the programmer to make an active choice here.

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Ticket URL: <http://cvs.haskell.org/trac/ghc/ticket/675>
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