[GHC] #3452: Show type of most recent expression in GHCi

[GHC]

#3452: Show type of most recent expression in GHCi
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Reporter:  ozy               |          Owner:                  
    Type:  feature request   |         Status:  new             
Priority:  normal            |      Component:  GHCi            
 Version:  6.10.4            |       Severity:  normal          
Keywords:                    |       Testcase:                  
      Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
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 Currently, any expression resulting in a value with no `Show` instance
 results in an error message. This is confusing for new users (especially
 if they don't yet understand typeclasses) and overly verbose for
 experienced users. Instead, the REPL should simply display the type of the
 expression, as if the user had used `:t`.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3452>
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