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Add -prelude-is flag

I would like GHC to have a -prelude-is flag, which would specify an alternate Prelude to use instead of the default Haskell prelude.

The benefit this would have is that this would give alternate preludes a more first-class status. Instead of having to import an alternative prelude everywhere, you could just have a ghc-options: -prelude-is=... flag in your *.cabal file, and have a different prelude be used. This is important for my own work, as I highly prefer other preludes for my non-library development; I think this is a feature which will be very useful as Haskell develops and we try to figure out how to get rid of the warts in the current Prelude.

Additional discussion here: https://groups.google.com/forum/#!topic/haskell-cafe/NCVzXZcxNmQ

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Version 7.9
Type FeatureRequest
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
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