[GHC] #8581: Add support for explicitly-bidirectional pattern synonyms

[GHC]

#8581: Add support for explicitly-bidirectional pattern synonyms
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              Reporter:  cactus      |            Owner:  cactus
                  Type:  feature     |           Status:  closed
  request                            |        Milestone:  7.10.1
              Priority:  normal      |          Version:
             Component:  Compiler    |         Keywords:
            Resolution:  fixed       |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:  5144
       Type of failure:              |  Related Tickets:
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by hvr):

 For the record: the commit-range 12644c3c0216edfcff33266f4f250e0c52004352
 to 535b37cbb5a11dd4c9d8260d1d00f4cb993af0e9 seems to be what was merged to
 address this ticket.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8581#comment:8>
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