[GHC] #13087: AlternativeLayoutRule breaks LambdaCase

[GHC]

#13087: AlternativeLayoutRule breaks LambdaCase
-------------------------------------+-------------------------------------
           Reporter:  ohhellojoe     |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
  (Parser)                           |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 {{{#!hs
 {-# LANGUAGE AlternativeLayoutRule #-}
 {-# LANGUAGE LambdaCase            #-}

 isOne :: Int -> Bool
 isOne = \case 1 -> True
               _ -> False

 main = return ()
 }}}

 {{{
 $ ghc test-case
 [1 of 1] Compiling Main             ( test-case.hs, test-case.o )

 test-case.hs:5:15: error: parse error on input ‘1’
 }}}

 It compiles fine without the AlternativeLayoutRule extension.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13087>
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