[GHC] #3984: interpret layout in GHCi

[GHC]

#3984: interpret layout in GHCi
---------------------------------+------------------------------------------
    Reporter:  aavogt            |       Owner:              
        Type:  bug               |      Status:  new         
    Priority:  normal            |   Component:  Compiler    
     Version:  6.12.1            |    Keywords:              
          Os:  Unknown/Multiple  |    Testcase:              
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown
---------------------------------+------------------------------------------
 This should work instead of needing '''{;}''' :

 {{{
 :{
 let f = do
       one
       two
       three
 :}
 }}}

 Also the up arrow key should bring back the whole block (and allow
 navigating within it), skipping to the next or previous block or command
 when going past the ''':}''' or ''':{'''.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3984>
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