[Haskell-cafe] Floating instance and pi

[Paul Keir]

Hi,

I'd like to make my ADT an instance of the Floating class,
but I'm not sure what to put for pi, and GHC gives a warning
without it:

Warning: No explicit method nor default method for `GHC.Float.pi'

I tried setting it to undefined, but that gives an error:

`pi' is not a (visible) method of class `Floating'

Any idea?

Paul
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