[GHC] #9378: Make unknown LANGUAGE pragmas a warning, not an error

[GHC]

#9378: Make unknown LANGUAGE pragmas a warning, not an error
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              Reporter:  goldfire    |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.8.2
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:              |       Blocked By:
  None/Unknown                       |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by goldfire):

 Thanks for finding that reference. I'm a big proponent of adhering to
 published standards, so that definitely cuts my proposal down a notch.
 Perhaps we could have a `-fallow-unrecognized-extensions`, or perhaps it's
 not worth the bother.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9378#comment:4>
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