[GHC] #8961: Require PatternSynonyms language extension to *use* pattern synonyms

[GHC]

#8961: Require PatternSynonyms language extension to *use* pattern synonyms
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        Reporter:  cactus            |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:  7.8.1
       Component:  Compiler (Type    |          Version:  7.8.1-rc2
  checker)                           |         Keywords:
      Resolution:                    |     Architecture:  Unknown/Multiple
Operating System:  Unknown/Multiple  |       Difficulty:  Easy (less than 1
 Type of failure:  None/Unknown      |  hour)
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by Dr. ERDI Gergo <gergo@…>):

 In [changeset:"8f831ec578d22419788542290e164c50524d90f6/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="8f831ec578d22419788542290e164c50524d90f6"
 Require PatternSynonyms language flag when encountering a use of pattern
 synonym
 (#8961)
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8961#comment:3>
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