[GHC] #4268: Annotation extension needs a flag

[GHC]

#4268: Annotation extension needs a flag
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        Reporter:  simonmar    |            Owner:
            Type:  bug         |           Status:  new
        Priority:  normal      |        Milestone:  7.6.2
       Component:  Compiler    |          Version:  7.0.4
      Resolution:              |         Keywords:
Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple             |       Difficulty:  Easy (less than 1 hour)
 Type of failure:  Other       |       Blocked By:
       Test Case:              |  Related Tickets:
        Blocking:              |
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Comment (by nomeata):

 People are starting to us annotation for example to tell HLint something;
 that this breaks compilation on non-stage2-architectures is really
 annoying.

 What speaks against issuing a warning if GHCi is not available?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4268#comment:9>
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