[GHC] #12390: List rules for `Coercible` instances

[GHC]

#12390: List rules for `Coercible` instances
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        Reporter:  Iceland_jack      |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      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 goldfire):

 +1 to comment:2. `Coercible` is not a class. Any resemblance it has to a
 class is purely historical.

 That said, I'm very sympathetic to the original motivation of having
 `:info Coercible` print something more useful.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12390#comment:3>
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