[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:  patch
        Priority:  lowest            |        Milestone:  7.10.1
       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 Joachim Breitner <mail@…>):

 In [changeset:"b4715d67ae90f4cc847daa94f0fc056a40057d65/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="b4715d67ae90f4cc847daa94f0fc056a40057d65"
 Replace forall'ed Coercible by ~R# in RULES

 we want a rule "map coerce = coerce" to match the core generated for
 "map Age" (this is #2110).
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/2110#comment:46>
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