[GHC] #4098: Haskell2010 support

[GHC]

#4098: Haskell2010 support
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    Reporter:  igloo             |        Owner:              
        Type:  feature request   |       Status:  new         
    Priority:  highest           |    Milestone:  6.14.1      
   Component:  Compiler          |      Version:  6.12.2      
    Keywords:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Testcase:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
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Description changed by igloo:

Old description:

> Discussion on #ghc concluded:
>
>  * Haskell2010, Haskell98 extensions are mutually incompatible (i.e. GHC
> should give an error if both are used), and are applied before other
> extensions in LANGUAGE pragmas, on the commandline, etc
>
>  * GHC will default to Haskell2010

New description:

 Discussion on #ghc concluded:

  * Haskell2010, Haskell98 extensions are mutually incompatible, i.e. it is
 an error if both appear in LANGUAGE pragmas in a source file. Incompatible
 values on the commandline are OK.

  * Haskell2010, Haskell98 are applied before other extensions in LANGUAGE
 pragmas, on the commandline, etc

  * GHC will default to Haskell2010

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4098#comment:2>
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