[GHC] #1921: change default to support extensions that involve a change of syntax

[GHC]

#1921: change default to support extensions that involve a change of syntax
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 Reporter:  alex             |          Owner:         
     Type:  feature request  |         Status:  new    
 Priority:  normal           |      Milestone:         
Component:  Compiler         |        Version:  6.8.1  
 Severity:  normal           |     Resolution:         
 Keywords:                   |     Difficulty:  Unknown
 Testcase:                   |   Architecture:  Unknown
       Os:  Unknown          |  
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Changes (by duncan):

  * difficulty:  => Unknown

Comment:

 Not very radical: GHC's warning messages that suggest using a language
 extensions should suggest using a LANGUAGE pragma in the source rather
 than an -X extension flag on the command line.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1921#comment:2>
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