[GHC] #3749: unexpected parse errors with `do` and `let`

[GHC]

#3749: unexpected parse errors with `do` and `let`
---------------------------+------------------------------------------------
    Reporter:  dherington  |       Owner:                           
        Type:  bug         |      Status:  new                      
    Priority:  normal      |   Component:  Compiler                 
     Version:  6.10.4      |    Keywords:  do, let, parse error     
          Os:  Windows     |    Testcase:                           
Architecture:  x86         |     Failure:  GHC rejects valid program
---------------------------+------------------------------------------------
 Unless I misunderstand, all three of the following definitions are
 syntactically correct.  However, f2 and f3 elicit parse errors.

 {{{
 f1 = do let x = 3
         return x

 f2 = do let x = 3; return x

 f3 = do { let x = 3; return x }
 }}}

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3749>
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