[Haskell-cafe] Noob error: Type b -> c b Does not match IO a
lemming at henning-thielemann.de
Sun Jun 26 15:02:35 EDT 2005
On Sun, 26 Jun 2005, Daniel Fischer wrote:
> > m x y = if x==0 then 0 else x*y
> foldr m 1
> does fine, in fact much better than
> foldl' (*) 1 . upTo (== 0),
> both in hugs and ghc, regarding speed and memory usage.
foldr m 1 [a,b,c]
m a (m b (m c 1)))
That is, it is not possible for the runtime system to store interim
numeric results, it can only accumulate function calls.
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