[GHC] #10972: Add a :binfo (beginner info) GHCi command

[GHC]

#10972: Add a :binfo (beginner info) GHCi command
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        Reporter:  kanetw            |                Owner:  kanetw
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #10963            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by goldfire):

 A few thoughts: we should only print out specialisations of class-
 constrained parameters (never parametric ones), and we have to worry about
 a combinatorial number of these if there are multiple constraints.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10972#comment:5>
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