[GHC] #13087: AlternativeLayoutRule breaks LambdaCase

[GHC]

#13087: AlternativeLayoutRule breaks LambdaCase
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        Reporter:  ohhellojoe        |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
  (Parser)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by osa1):

 I'm wondering how you found that flag. I did some digging, it seems like
 that
 feature was added with https://github.com/ghc/ghc/commit/16c7844d and
 later
 used in https://github.com/ghc/ghc/commit/4edbeb14e to as a part of GHCi's
 `:m`
 (which is probably the same thing with `:set +m`). It was never
 documented, and
 currently it's not even listed in GHC's man page or user manual.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13087#comment:1>
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