[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
              Keywords:              |  Operating System:  Linux
          Architecture:              |   Type of failure:  Incorrect
  Unknown/Multiple                   |  warning at compile-time
             Test Case:              |        Blocked By:
              Blocking:              |   Related Tickets:
Differential Revisions:              |
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 In particular, I was struggling with the QuasiQuotes language extension. I
 had -
 {{{#!hs
 {-# LANGAUGE QuasiQuotes #-}

 site = [shamelet|Hello World!|]
 }}}
 Notice the transposed A and U in `LANGUAGE`

 The error that ghc was emitting was -
 `Main.hs:23:47: parse error on input ‘]’`

 It took me a long time and a lot of head-banging to figure out that it was
 a typo in the language pragma, especially because the language pragma was
 surrounded by other language pragmas and it was at the top of the file.

 I would think that this should at least emit a warning when there is a
 typo in a pragma.

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