[GHC] #9293: GHCI :unset -XLanguageExtension returns "don't know how to reverse -XLanguageExtension"

[GHC]

#9293: GHCI :unset -XLanguageExtension returns "don't know how to reverse
-XLanguageExtension"
-------------------------------------+-------------------------------------
              Reporter:  jfeltz      |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  GHCi        |          Version:  7.8.2
            Resolution:              |         Keywords:  newcomer
      Operating System:              |     Architecture:  x86
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:              |       Blocked By:
  None/Unknown                       |  Related Tickets:
             Test Case:  :set -XCPP  |
  followed by :unset -XCPP           |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
Changes (by thomie):

 * keywords:   => newcomer


Comment:

 Also consider `:unset -XNoExt`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9293#comment:2>
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