[Haskell-cafe] Stream fusion and span/break/group/init/tails

[Bryan O'Sullivan]

On Wed, Apr 24, 2013 at 10:47 AM, Duncan Coutts <
duncan.coutts at googlemail.com> wrote:

> I address it briefly in my thesis [1], Section 4.8.2. I think it's a
> fundamental limitation of stream fusion.
>

See also concat, where the naive fusion-based implementation has quadratic
performance:

concat :: [Text] -> Text
concat txts = unstream (Stream.concat (List.map stream txts))

I've never figured out how to implement this with sensible characteristics
within the fusion framework.
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