[GHC] #9975: RecordWildcards and PatternSynonyms cause impossible bug

[GHC]

#9975: RecordWildcards and PatternSynonyms cause impossible bug
-------------------------------------+-------------------------------------
        Reporter:  gamegoblin        |                   Owner:
            Type:  bug               |                  Status:  closed
        Priority:  normal            |               Milestone:  7.10.1
       Component:  Compiler          |                 Version:  7.10.1-rc1
      Resolution:  fixed             |                Keywords:
Operating System:  Unknown/Multiple  |  RecordWildcards PatternSynonyms
 Type of failure:  Compile-time      |            Architecture:  x86_64
  crash                              |  (amd64)
      Blocked By:                    |               Test Case:
 Related Tickets:                    |  patsyn/should_compile/T9975a,b
                                     |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
Changes (by simonpj):

 * status:  new => closed
 * testcase:   => patsyn/should_compile/T9975a,b
 * resolution:   => fixed


Comment:

 I'm not sure what fixed it, but I'm content to let sleeping dogs lie.
 I've added a regression test though.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9975#comment:7>
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