[GHC] #4316: Enable GHCi to run commands under StateT monad based on IO

[GHC]

#4316: Enable GHCi to run commands under StateT monad based on IO
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    Reporter:  mitar             |       Owner:              
        Type:  feature request   |      Status:  new         
    Priority:  normal            |   Component:  GHCi        
     Version:  6.12.3            |    Keywords:              
    Testcase:                    |   Blockedby:              
          Os:  Unknown/Multiple  |    Blocking:              
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown
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Changes (by vivian):

 * cc: haskell.vivian.mcphail@… (added)


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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4316#comment:1>
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