Ok, I see now why the return is necessary. For now I'll switch to
boxed arrays until I get the rest of this down better.
But why should this...
sumArrays [] = error "Can't apply sumArrays to an empty list"
sumArrays (x:xs) = runSTArray (result x)
where
result x = do x0 <- thaw x
mapM_ (x0 +=) xs
return x0
work differently than this...
sumArrays' [] = error "Can't apply sumArrays to an empty list"
sumArrays' (x:xs) = runSTArray result'
where
result' = do x0 <- thaw x
mapM_ (x0 +=) xs
return x0
Are the types of (result x) and result' not exactly the same?
--
Chad Scherrer
"Time flies like an arrow; fruit flies like a banana" -- Groucho Marx
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