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

[GHC]

#10843: Allow do blocks without dollar signs as arguments
-------------------------------------+-------------------------------------
        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 Iceland_jack):

 Would this allow

 {{{#!hs
 foo = do
   liftIO do
     putStrLn do
       "hello" ++ "world"
 }}}

 meaning

 {{{#!hs
 foo = do
   liftIO $ do
     putStrLn $ do
       "hello" ++ "world"
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10843#comment:16>
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