[Haskell-cafe] Stream fusion

[Yves Parès]

Hello,

While re-reading RealWorldHaskell, chapter 25, I saw that -- unlike I
believed -- loop fusion wasn't activated by default under GHC for lists
(but that module Data.List.Stream from package stream-fusion could provide
it).
Is that still the case? If not, then are there some cases of list
processing where loop fusion would be a bad thing? (Ergo cases where you
should stick to Prelude/Data.List functions and not use Data.List.Stream
implementation)

Thanks.
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