[GHC] #10843: Allow do blocks without dollar signs as arguments

[GHC]

#10843: Allow do blocks without dollar signs as arguments
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        Reporter:  agibiansky        |                   Owner:  agibiansky
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.2
  (Parser)                           |
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by mpickering):

 How about case, if and let expressions?

 I personally found it a bit inconsistent that `id Record {..}` parsed
 correctly so this does bring the other expression types in line with that
 behaviour. On the other hand, I think the `$` is useful for the reader to
 indicate that what follows is the final single argument.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10843#comment:5>
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