[GHC] #12007: Panic when loading file with nested pattern synonyms into ghci

[GHC]

#12007: Panic when loading file with nested pattern synonyms into ghci
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        Reporter:  MikeIzbicki       |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
                                     |  PatternSynonyms
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 Simon Peyton Jones <simonpj@…>):

 In [changeset:"0f1e315b9274725c4a2c975f4d06a5c956cf5385/ghc" 0f1e315/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="0f1e315b9274725c4a2c975f4d06a5c956cf5385"
 Fix bytecode gen to deal with rep-polymorphism

 When faced runtime-rep-polymorphic code from a pattern-synonym
 matcher, the bytecode generator was treating the result as lifted,
 which it isn't.  The fix is just to treat those rep-polymorphic
 continuations like unlifted types, and add a dummy arg.

 Trac #12007 is a case in point.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12007#comment:12>
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