[GHC] #12986: Ignore case when parsing language pragmas

[GHC]

#12986: Ignore case when parsing language pragmas
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           Reporter:  dfeuer         |             Owner:
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
  (Parser)                           |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 It's annoying to have to remember exactly how a language extension is
 supposed to be capitalized. It seems highly unlikely that we will ever
 have two different language extensions that differ only by case.
 Therefore, I think GHC should ignore case when matching `{-# LANGUAGE #-}`
 pragmas. Thus, we should accept not only `UndecidableSuperClasses` but
 also `UndecidableSuperclasses`, etc.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12986>
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