[GHC] #8749: Pattern synonyms crash GHCi

[GHC]

#8749: Pattern synonyms crash GHCi
-------------------------------------+------------------------------------
        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:
        Blocking:                    |  Related Tickets:
-------------------------------------+------------------------------------

Comment (by cactus):

 The real problem seems to me to be the fact that local pattern synonym
 definitions are not rejected.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8749#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler