[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 nomeata):

 Generally sympathetic to this change, less parenthesis are good. For
 lambdas it looks a bit unusual, but I think I’d quickly adjust to parsing
 that.

 Minor comment: In the wiki page you include `{-# SCC #-}` and `{-# CORE
 #-}`. I’d doubtful about them. I mentally parse them not as control
 structures, but as if they were normal functions (which happen to only
 work when used fully applied), and would be surprised if `f a b {-# SCC
 #-} d e` turn into  `f a b ({-# SCC #-} d e)`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10843#comment:19>
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