[GHC] #11975: New GHCi command to print out the type of an expression without instantiating

[GHC]

#11975: New GHCi command to print out the type of an expression without
instantiating
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           Reporter:  goldfire       |             Owner:
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:  GHCi           |           Version:  8.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 #11376 changed the meaning of `:type` to deeply instantiate a type before
 printing. This means that we can't see which variables were specified and
 which were inferred.

 I propose `:type-spec` (please suggest a better name) that does not
 instantiate first.

 Phab patch to be posted shortly.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11975>
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