[Haskell-cafe] Pointless functors

[Martijn van Steenbergen]

Eugene Kirpichov wrote:
> 'An arbitrary element' means 'undefined will suffice'
> 
> point x = fmap (const x) undefined

Prelude> fmap (const True) undefined :: [Bool]
*** Exception: Prelude.undefined

Or is that not what you mean?

Martijn.