[Haskell-cafe] Unique functor instance

Claus Reinke claus.reinke at talk21.com
Tue Nov 25 08:40:57 EST 2008

> Are identity and composition sufficient to guarantee that the
> mapped function is actually applied?

eek - f :: a -> b, not f :: a -> a, so that example doesn't work !!

Sorry for the noise,

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