[GHC] #3647: unify handling and error messages for -X vs. {-#LANGUAGE ...#-} pragmas/extensions

[GHC]

#3647: unify handling and error messages for -X vs. {-#LANGUAGE ...#-}
pragmas/extensions
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        Reporter:  eflister          |            Owner:
            Type:  feature request   |           Status:  patch
        Priority:  normal            |        Milestone:  7.8.1
       Component:  Compiler          |          Version:  6.10.4
  (Parser)                           |         Keywords:  language pragma
      Resolution:                    |  extensions error message warning
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by Joachim Breitner <mail@…>):

 In [changeset:bb0e5b59b11037529b5a1c623fe077988c853056/testsuite]:
 {{{
 #!CommitTicketReference repository="testsuite"
 revision="bb0e5b59b11037529b5a1c623fe077988c853056"
 Adjust test suite to new Language Pragma warnigns

 (this is related to #3647)
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/3647#comment:23>
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