[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:  #11706            |  Differential Rev(s):  Phab:D1219
       Wiki Page:                    |
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Comment (by maeder):

 @aiko The Cons point "You can already get rid of the $ by just adding
 parentheses" is only an argument against "$" (or the title of this issue)
 but not against ArgumentDo.

 It is actually a Pros point: Allow to get rid of parentheses without using
 the $-workaround.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10843#comment:31>
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