[GHC] #10498: "if ... then \case -> else ..." causes a "missing else clause" error

[GHC]

#10498: "if ... then \case -> else ..." causes a "missing else clause" error
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        Reporter:  dramforever       |                Owner:
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  7.10.3
       Component:  Compiler          |              Version:  7.10.1
  (Parser)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1309
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Comment (by simonmar):

 Worth double-checking to see whether the set of shift/reduce conflicts in
 `Parser.y` needs updating.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10498#comment:8>
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