[GHC] #11971: Unify error messages that suggest enabling extensions

[GHC]

#11971: Unify error messages that suggest enabling extensions
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        Reporter:  cocreature        |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 I'm all for it!  Let's not just use the same string, but rather put the
 string into a function and call that.

 I don't feel strongly about wording -- ask users.  My instinct is "Perhaps
 you meant to use _".

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11971#comment:2>
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