[GHC] #14507: Core Lint error with Type.Reflection and pattern synonyms

[GHC]

#14507: Core Lint error with Type.Reflection and pattern synonyms
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        Reporter:  Iceland_jack      |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:
       Component:  Compiler          |              Version:  8.2.1
      Resolution:                    |             Keywords:
                                     |  PatternSynonyms, TypeInType
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 simonpj):

 OK now we just reject this program with this error message
 {{{
 T14507.hs:19:9: error:
     • Iceland Jack!  Iceland Jack! Stop torturing me!
       Pattern-bound variable x :: TypeRep a
         has a type that mentions pattern-bound coercion: co_a2CF
       Hint: use -fprint-explicit-coercions to see the coercions
       Probable fix: add a pattern signature
     • In the declaration for pattern synonym ‘SO’
 }}}
 I hope you don't mind being immoralised in an error message.  If you do,
 just say and I'll remove it.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14507#comment:6>
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