[GHC] #10106: GHC doesn't warn on typos in language pragmas

[GHC]

#10106: GHC doesn't warn on typos in language pragmas
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        Reporter:  sdemos            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.8.4
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  Incorrect         |  (amd64)
  warning at compile-time            |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #10076            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Lemming):

 Sometimes I (ab)use `-fdefer-type-errors` in order to see warnings along
 with errors.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10106#comment:7>
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