[GHC] #15610: GHCi command to list instances a (possibly compound) type belongs to

[GHC]

#15610: GHCi command to list instances a (possibly compound) type belongs to
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        Reporter:  Iceland_jack      |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  lowest            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by xldenis):

 Hi! I'd like to volunteer as tribute to implement this. I am superficially
 familiar with the GHC codebase and I'm sure I can inspire myself from the
 work done on the `:doc` command this summer.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15610#comment:2>
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