[GHC] #9732: Pattern synonyms and unboxed values

[GHC]

#9732: Pattern synonyms and unboxed values
-------------------------------------+-------------------------------------
       Reporter:  monoidal           |                   Owner:
           Type:  bug                |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  Compiler           |                 Version:  7.8.3
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Unknown            |         Type of failure:  Compile-
     Blocked By:                     |  time crash
Related Tickets:                     |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
 It's possible to declare a toplevel unboxed value with a pattern synonym,
 which causes a panic:

 {{{
 {-# LANGUAGE PatternSynonyms, MagicHash #-}
 pattern P = 0#
 }}}

 (compare with error on `x = 0#`).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9732>
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