[GHC] #9230: Make -fwarn-tabs the default

[GHC]

#9230: Make -fwarn-tabs the default
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       Reporter:  dfeuer                   |             Owner:
           Type:  feature request          |            Status:  new
       Priority:  normal                   |         Milestone:
      Component:  Compiler                 |           Version:  7.8.2
       Keywords:                           |  Operating System:
   Architecture:  Unknown/Multiple         |  Unknown/Multiple
     Difficulty:  Easy (less than 1 hour)  |   Type of failure:
     Blocked By:                           |  None/Unknown
Related Tickets:                           |         Test Case:
                                           |          Blocking:
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 Tabs trip up an awful lot of Haskell beginners. Turning the warning on by
 default will likely save them a lot of grief. Any
 insane^h^h^h^h^h^hexperienced Haskellers who like tabs will have no
 trouble disabling the warning in their pragmas.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9230>
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