[GHC] #9394: Show data/type family instances with ghci's :info command

[GHC]

#9394: Show data/type family instances with ghci's :info command
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              Reporter:  s9gf4ult    |            Owner:
                  Type:  feature     |           Status:  new
  request                            |        Milestone:
              Priority:  normal      |          Version:  7.6.3
             Component:  GHCi        |         Keywords:  ghci
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by simonpj):

 Dear s9gf4ult (I wonder who you are in real life?)

 That makes sense.  For classes, actually `:info Eq` lists all the
 instances of `Eq`, so maybe that should happen for `type` and `data`
 families too?  Then adding arguments could filter the list to just the
 instances that match the pattern given?

 Would you, or anyone else, like to specify the feature and offer a patch?

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9394#comment:1>
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