[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 cocreature):

 Replying to [comment:2 simonpj]:
 > Let's not just use the same string, but rather put the string into a
 function and call that.

 That’s what I was planning to do.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11971#comment:3>
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