[GHC] #10847: :info should print minimal definition

[GHC]

#10847: :info should print minimal definition
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              Reporter:  osa1        |             Owner:
                  Type:  feature     |            Status:  new
  request                            |
              Priority:  lowest      |         Milestone:
             Component:  GHCi        |           Version:  7.11
              Keywords:  newcomer    |  Operating System:  Unknown/Multiple
          Architecture:              |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
             Test Case:              |        Blocked By:
              Blocking:              |   Related Tickets:
Differential Revisions:              |
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 It'd be great if `:info` would print minimal definitions too. This way we
 can implement a typeclass that we learn about using `:info` without having
 to look at the haddocks.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10847>
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