[Haskell-cafe] Re: Where do I put the seq?

[Peter Verswyvelen]

It seems that with Ryan's approach, DList is not needed, simple concat works
fine.
It also seems to run in constant space. Now I must do the exercise of
rewriting it to see why concat works, since >>= is infixl and ++ is infixr,
this seems odd :) But again, my mind might be thinking too strict (bad
imperative habits?)

http://hpaste.org/fastcgi/hpaste.fcgi/view?id=8316#a8357
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