[GHC] #8815: confusing language in error message

[GHC]

#8815: confusing language in error message
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        Reporter:  carter            |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.8.1-rc1
      Resolution:                    |         Keywords:
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 simonpj):

 Personally, I would have stuck with the previous `-XTypeFamilies` form in
 error messages, because it's an unambiguous clue that this is a language
 pragma.  I suppose that (more verbosely) one could say `extension
 TypeFamilies` in error messages.

 But this is a user issue, so I didn't protest for #3647. If someone wants
 to re-open the question and gather opinions from users, I'm happy for GHC
 to adopt the result.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8815#comment:3>
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