[GHC] #12633: Support standard syntax for language pragmas in GHCi

[GHC]

#12633: Support standard syntax for language pragmas in GHCi
-------------------------------------+-------------------------------------
           Reporter:  Hjulle         |             Owner:
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:  GHCi           |           Version:  8.0.1
           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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 It would be convenient to be able to use the standard (module level)
 syntax for language pragmas in GHCi

 {{{#!hs
 {-# LANGUAGE Extension #-}
 }}}

 instead of just the GHCi specific syntax

 {{{#!hs
 :set -XExtension
 }}}

 For example, this would simplify copy-pasting examples and code into GHCi,
 especially now that most other module level syntax is supported. It might
 also reduce confusion for new users, since the syntax is the same in both
 cases.

 If it is not too difficult, I might take on this myself as a good first
 bug.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12633>
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