[Haskell-cafe] Musings on lists

[Todd Wilson]

Thanks to those who have contributed answers to my questions. I can see
how, in a context like

let zs = xs ++ ys

in ....

with a persistent reference to the concatenation, the spine (not the
elements) of xs would have to be copied, because zs might need to be
traversed multiple times. But what about something like

f (xs ++ ys)

for a function f that makes a single pass through its argument list (like
length or sum)?

--Todd
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