[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 I also agree fully with Richard Eisenberg and do not understand your
 objection.

 Therefore I would like if you could add "it makes the language more
 regular" under Pros, omitted your last paragraph, and really simplified
 the proposed grammar rules accordingly (namely without lexp and openexp)
 on ArgumentDo.

 (For a discussion/omission of group A and group B constructs I refer to
 https://mail.haskell.org/pipermail/glasgow-haskell-
 users/2016-July/026299.html)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10843#comment:29>
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