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The RWH books says that to get ByteString support, I need to add:
instance Arbitrary B.ByteString where
arbitrary = fmap B.pack arbitrary
coarbitrary = coarbitrary . B.unpack
But my GHC 7.2 with QuickCheck 2.4.1.1 tells me:
`coarbitrary' is not a (visible) method of class `Arbitrary'
Any pointers?
coarbitraryhas moved to it’s own typeclassCoAbritaryin QC 2.0, so simply just remove the equation forcoarbitrary.Also see the latest documentation.