[GHC] #2110: Rules to eliminate casted id's

[GHC]

#2110: Rules to eliminate casted id's
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        Reporter:  igloo             |            Owner:
            Type:  feature request   |           Status:  new
        Priority:  lowest            |        Milestone:  7.6.2
       Component:  Compiler          |          Version:  6.8.2
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by nomeata):

 > I’m not convinced about your solution. It seems a bit of a hack.

 I’m just re-reading this thread, and it seems that my proposed solution
 (replace `Coercible` in a rule with `~R#`, and inline `coercoe`) is
 precisely what we had concluded last week – is that right or was there a
 misunderstanding on my side?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/2110#comment:40>
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