[GHC] #16097: Bad error message for a misaligned case block in a do-let expression

[GHC]

#16097: Bad error message for a misaligned case block in a do-let expression
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        Reporter:  kanetw            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.6.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Poor/confusing    |  Unknown/Multiple
  error message                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by svenpanne):

 Replying to [comment:1 osa1]:
 > I suspect (but haven't verified) that this is caused by the block
 arguments patch: be84823b956f0aa09c58d94d1901f2dff13546b4

 Well, confusion is the price you have to pay when you try to give more or
 less every sequence of characters a meaning... Introducing tons of
 conflicts into the parser should have been a clear warning sign that
 BlockArguments and quite a few of the recent "improvements" to the syntax
 are a bad idea.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16097#comment:2>
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