[GHC] #8749: Pattern synonyms crash GHCi

[GHC]

#8749: Pattern synonyms crash GHCi
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        Reporter:  monoidal          |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.7
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:  8757
        Blocking:                    |  Related Tickets:
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Comment (by Dr. ERDI Gergo <gergo@…>):

 In [changeset:"e0a55415545074bc7a757462624079f54f7785e2/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="e0a55415545074bc7a757462624079f54f7785e2"
 Issue an error for pattern synonyms defined in a local scope (#8757)

 This also fixes the internal crash when using pattern synonyms
 in GHCi (#8749)
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8749#comment:3>
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