[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 rwbarton):

 I don't think parsing `f a b {-# SCC #-} d e` as `f a b ({-# SCC #-} d e)`
 is even an option, really, since these pragmas must be ignorable by
 compilers that don't understand them. Also, I think/hope this proposal
 does not change the parsing of any program that currently parses, right?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10843#comment:23>
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