Proposal: Warn when using Enum instance of Float or Double

[harry]

Simon Peyton-Jones wrote
> I don't think it would be that hard to add DEPRECATE for instances.  A bit
> fiddly, and what should the syntax be.. but not really hard.  I can offer
> advice if someone wants to undertake it.

The instances in question are part of prelude - could they be deprecated by
GHC before haskell' deprecates them in a future language standard?



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