#3085: warn about language extensions that are not used
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    Reporter:  PVerswyvelen                  |        Owner:                  
        Type:  feature request               |       Status:  new             
    Priority:  normal                        |    Milestone:                  
   Component:  Compiler                      |      Version:  6.10.1          
    Severity:  normal                        |   Resolution:                  
    Keywords:  warnings extensions language  |   Difficulty:  Unknown         
    Testcase:                                |           Os:  Unknown/Multiple
Architecture:  Unknown/Multiple              |  
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Comment (by simonpj):

 The most common way to consult the flags is thus:
 {{{
 dopt :: DynFlag -> Tc Bool
 }}}
 What I was suggesting is that `dopt` could record on the side that the
 flag was consulted. The tax is in `dopt` only.

 Not all flags are consulted in this way, but most are.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3085#comment:10>
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