[GHC] #1835: Provide information of the instance environment

[GHC]

#1835: Provide information of the instance environment
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    Reporter:  guest             |        Owner:              
        Type:  feature request   |       Status:  new         
    Priority:  normal            |    Milestone:  _|_         
   Component:  Template Haskell  |      Version:  6.8.1       
    Keywords:                    |   Difficulty:  Unknown     
          Os:  Unknown/Multiple  |     Testcase:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
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Changes (by Ashley Yakeley):

  * failure:  => None/Unknown


Comment:

 +1.

 It would be more useful if the return type were Q [Decl], so we could see
 details of all instances of the given class that reference the given type.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1835#comment:5>
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