[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:                   |     Testcase:         
Architecture:  Unknown          |           Os:  Unknown
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Comment (by alex):

 the reason for not allowing extension flags on the command line is that
 source files should have all the information necessary to interpret them.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1921#comment:1>
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