[GHC] #3984: interpret layout in GHCi

[GHC]

#3984: interpret layout in GHCi
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    Reporter:  aavogt            |        Owner:              
        Type:  feature request   |       Status:  new         
    Priority:  normal            |    Milestone:  6.14.1      
   Component:  GHCi              |      Version:  6.12.1      
    Keywords:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Testcase:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
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Comment(by aavogt):

 The attached patch allows ex.

 {{{
 Prelude> :{
 Prelude| let x = 1
 Prelude|     y = 2
 Prelude| in x + y
 Prelude| :}
 3
 }}}

 But the history part of this isn't done.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3984#comment:3>
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