darcs patch: Split known-extensions off into their own type, and re...

[Ian Lynagh]

1 patch for repository http://darcs.haskell.org/packages/Cabal:

Tue Oct 26 00:26:24 BST 2010  Ian Lynagh <igloo at earth.li>
  * Split known-extensions off into their own type, and remove knownExtensions
  The knownExtensions list had already got out of sync with the datatype.
  Now we use an Enum instance to get the list of constructors.
  Also, having the actual extensions in a separate type than UnknownExtension
  and EnableExtension makes it easier to add extension disabling support
  later.
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